N. D. Pathirana, R. G. T. Zegers, B. Gao, A. Spyrou, A. C. Larsen, H. Berg, D. Bazin, H. L. Crawford, A. Gade, P. Gastis, T. Ginter, C. J. Guess, M. Guttormsen, S. Noji, B. Longfellow, J. Pereira, L. A. Riley, D. Weisshaar, J. C. Zamora
{"title":"Extraction of neutron-capture cross sections on <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mmultiscripts> <mml:mi>Zr</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>92</mml:mn> </mml:mmultiscripts> </mml:math> using the charge-exchange Oslo method","authors":"N. D. Pathirana, R. G. T. Zegers, B. Gao, A. Spyrou, A. C. Larsen, H. Berg, D. Bazin, H. L. Crawford, A. Gade, P. Gastis, T. Ginter, C. J. Guess, M. Guttormsen, S. Noji, B. Longfellow, J. Pereira, L. A. Riley, D. Weisshaar, J. C. Zamora","doi":"10.1103/qdsh-ygry","DOIUrl":"https://doi.org/10.1103/qdsh-ygry","url":null,"abstract":"","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"113 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147916854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Iwasa, K. Ichimura, Shinsuke Ishikawa, M. Egeta, T. Haginouchi, S. Ishio, S. Matsue, S. Kubono, K. Nishio, K. Hirose, H. Makii, R. Orlandi, F. Suzaki, J. Smallcombe
The $^{7}mathrm{Li}(^{3}mathrm{He},d)^{8}mathrm{Be}^{*}(p)^{7}mathrm{Li}$ reaction was measured at ${E}_{mathrm{lab}}(^{3}mathrm{He})=28$ MeV for studying the $^{7}mathrm{Be}(n,{p}_{1})^{7}mathrm{Li}^{*}$ reaction, which is a $^{7}mathrm{Be}$ destruction reaction in the big bang nucleosynthesis. Resonant states at 18.9--20.1 MeV in $^{8}mathrm{Be}$ were populated by the $^{7}mathrm{Li}(^{3}mathrm{He},d)^{8}mathrm{Be}^{*}$ reaction and decay protons to the ground (${p}_{0}$) and first-excited states (${p}_{1}$) in $^{7}mathrm{Li}$ were well separated and measured. The resonance width $mathrm{ensuremath{Gamma}}$ and branching ratio ${mathrm{ensuremath{Gamma}}}_{p1}/{mathrm{ensuremath{Gamma}}}_{p0}$ for the 19.40-MeV state in $^{8}mathrm{Be}$ were deduced to be $342ifmmodepmelsetextpmfi{}112$ keV and $11.2ifmmodepmelsetextpmfi{}3.5ifmmodepmelsetextpmfi{}5.0$ (syst.)%, respectively. The $^{7}mathrm{Be}(n,{p}_{1})^{7}mathrm{Li}^{*}$ reaction cross section was deduced.
{"title":"Experimental determination of the resonance width and the branching ratio <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:msub><mml:mi mathvariant=\"normal\">Γ</mml:mi><mml:mrow><mml:mi>p</mml:mi><mml:mn>1</mml:mn></mml:mrow></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi mathvariant=\"normal\">Γ</mml:mi><mml:mrow><mml:mi>p</mml:mi><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> for the 19.40-MeV state in <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi>Be</mml:mi><mml:mprescripts/><mml:none/><mml:mn>8</mml:mn></mml:mmultiscripts></mml:math> for studying the <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi>Be</mml:mi><mml:mprescripts/><mml:none/><mml:mn>7</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:msub><mml:mi>p</mml:mi><mml:mn>1</mml:mn></mml:msub><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi>Li</mml:mi><mml:none/><mml:mo>*</mml:mo><mml:mprescripts/><mml:none/><mml:mn>7</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> reaction relevant to the cosmological lithium problem","authors":"N. Iwasa, K. Ichimura, Shinsuke Ishikawa, M. Egeta, T. Haginouchi, S. Ishio, S. Matsue, S. Kubono, K. Nishio, K. Hirose, H. Makii, R. Orlandi, F. Suzaki, J. Smallcombe","doi":"10.1103/jhgx-cht5","DOIUrl":"https://doi.org/10.1103/jhgx-cht5","url":null,"abstract":"The $^{7}mathrm{Li}(^{3}mathrm{He},d)^{8}mathrm{Be}^{*}(p)^{7}mathrm{Li}$ reaction was measured at ${E}_{mathrm{lab}}(^{3}mathrm{He})=28$ MeV for studying the $^{7}mathrm{Be}(n,{p}_{1})^{7}mathrm{Li}^{*}$ reaction, which is a $^{7}mathrm{Be}$ destruction reaction in the big bang nucleosynthesis. Resonant states at 18.9--20.1 MeV in $^{8}mathrm{Be}$ were populated by the $^{7}mathrm{Li}(^{3}mathrm{He},d)^{8}mathrm{Be}^{*}$ reaction and decay protons to the ground (${p}_{0}$) and first-excited states (${p}_{1}$) in $^{7}mathrm{Li}$ were well separated and measured. The resonance width $mathrm{ensuremath{Gamma}}$ and branching ratio ${mathrm{ensuremath{Gamma}}}_{p1}/{mathrm{ensuremath{Gamma}}}_{p0}$ for the 19.40-MeV state in $^{8}mathrm{Be}$ were deduced to be $342ifmmodepmelsetextpmfi{}112$ keV and $11.2ifmmodepmelsetextpmfi{}3.5ifmmodepmelsetextpmfi{}5.0$ (syst.)%, respectively. The $^{7}mathrm{Be}(n,{p}_{1})^{7}mathrm{Li}^{*}$ reaction cross section was deduced.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"112 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147893240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. J. Kelly, P. A. Copp, J. Surbrook, E. A. Bennett, M. Devlin, J. M. O'Donnell, N. Mendez, M. Paris, H. Sasaki
{"title":"Measurement of the <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi>Si</mml:mi><mml:mprescripts/><mml:none/><mml:mn>28</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:msup><mml:mi>n</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mi>γ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> cross section with <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>γ</mml:mi></mml:math>, and correlated <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mi>n</mml:mi><mml:mtext>−</mml:mtext><mml:mi>γ</mml:mi></mml:mrow></mml:math> angular distributions","authors":"K. J. Kelly, P. A. Copp, J. Surbrook, E. A. Bennett, M. Devlin, J. M. O'Donnell, N. Mendez, M. Paris, H. Sasaki","doi":"10.1103/q8rv-2m1v","DOIUrl":"https://doi.org/10.1103/q8rv-2m1v","url":null,"abstract":"","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147922603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Knapová, K. Horčičková, A. Couture, C. Fry, F. Gunsing, Toshihiko Kawano, Keegan Kelly, M. Krtička, Esther Leal Cidoncha, C. J. Prokop, R. Reifarth, G. Rusev, J. L. Ullmann, S. Valenta
Radiative neutron capture on thulium, which is a monoisotopic element, plays a role in different applications such as nuclear astrophysics or nuclear burning environments. Considerable discrepancies—reaching 20%—exist between evaluations in the unresolved-resonance region. Furthermore, experimental data on statistical <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>γ</a:mi></a:math> decay in odd-odd rare-earth nuclei is scarce. There are still open questions about the systematics of the so-called scissors mode in the <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mi>M</b:mi><b:mn>1</b:mn></b:mrow></b:math> photon strength function, especially in odd-odd nuclei. This work is focused on two main topics—deriving experimental <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mmultiscripts><c:mi>Tm</c:mi><c:mprescripts/><c:none/><c:mn>169</c:mn></c:mmultiscripts><c:mo>(</c:mo><c:mi>n</c:mi><c:mo>,</c:mo><c:mi>γ</c:mi><c:mo>)</c:mo></c:mrow></c:math> cross section and studying statistical <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mi>γ</d:mi></d:math> decay of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mmultiscripts><e:mi>Tm</e:mi><e:mprescripts/><e:none/><e:mn>170</e:mn></e:mmultiscripts></e:math>, in particular properties of the scissors mode. The capture experiments to obtain experimental cross section were performed at the Los Alamos Neutron Science Center using the time-of-flight technique and employing the Detector for Advanced Neutron Capture Experiments. Measured coincident <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"><f:mi>γ</f:mi></f:math>-ray spectra were also compared with statistical simulations using the code to test different models of level density and photon strength functions. The capture cross section was determined from 1.8 eV to 0.97 MeV, the broadest neutron-energy range ever measured for this isotope. Several new resonances have been observed. The statistical <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"><g:mi>γ</g:mi></g:math> decay of <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"><h:mmultiscripts><h:mi>Tm</h:mi><h:mprescripts/><h:none/><h:mn>170</h:mn></h:mmultiscripts></h:math> cannot be reproduced without a scissors mode resonance centered at <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:mrow><i:mo>≈</i:mo><i:mn>3.3</i:mn><i:mspace width="0.28em"/><i:mi>MeV</i:mi></i:mrow></i:math>. The measured cross section in the unresolved-resonance region is generally lower than the latest evaluations. The derived <k:math xmlns:k="http://www.w3.org/1998/Math/MathML"><k:mmultiscripts><k:mi>Tm</k:mi><k:mprescripts/><k:none/><k:mn>169</k:mn></k:mmultiscripts><k:mo> </k:mo><k:mi>s</k:mi></k:math>-process abundance is expected to increase by a factor of 1.26, while the changes of the abundances of elements heavier than <l:math xmlns:l="http://www.w3.org/1998/Math/MathML"><l:mmultiscripts><l:mi>Tm</l:mi><l:mprescripts/><l:none/><l:mn>169</l:mn><
{"title":"<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi>Tm</mml:mi><mml:mprescripts/><mml:none/><mml:mn>169</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> cross section and statistical decay properties from measurements at the DANCE facility","authors":"I. Knapová, K. Horčičková, A. Couture, C. Fry, F. Gunsing, Toshihiko Kawano, Keegan Kelly, M. Krtička, Esther Leal Cidoncha, C. J. Prokop, R. Reifarth, G. Rusev, J. L. Ullmann, S. Valenta","doi":"10.1103/5sjr-vyjv","DOIUrl":"https://doi.org/10.1103/5sjr-vyjv","url":null,"abstract":"Radiative neutron capture on thulium, which is a monoisotopic element, plays a role in different applications such as nuclear astrophysics or nuclear burning environments. Considerable discrepancies—reaching 20%—exist between evaluations in the unresolved-resonance region. Furthermore, experimental data on statistical <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\"><a:mi>γ</a:mi></a:math> decay in odd-odd rare-earth nuclei is scarce. There are still open questions about the systematics of the so-called scissors mode in the <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mrow><b:mi>M</b:mi><b:mn>1</b:mn></b:mrow></b:math> photon strength function, especially in odd-odd nuclei. This work is focused on two main topics—deriving experimental <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mmultiscripts><c:mi>Tm</c:mi><c:mprescripts/><c:none/><c:mn>169</c:mn></c:mmultiscripts><c:mo>(</c:mo><c:mi>n</c:mi><c:mo>,</c:mo><c:mi>γ</c:mi><c:mo>)</c:mo></c:mrow></c:math> cross section and studying statistical <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mi>γ</d:mi></d:math> decay of <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mmultiscripts><e:mi>Tm</e:mi><e:mprescripts/><e:none/><e:mn>170</e:mn></e:mmultiscripts></e:math>, in particular properties of the scissors mode. The capture experiments to obtain experimental cross section were performed at the Los Alamos Neutron Science Center using the time-of-flight technique and employing the Detector for Advanced Neutron Capture Experiments. Measured coincident <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"><f:mi>γ</f:mi></f:math>-ray spectra were also compared with statistical simulations using the code to test different models of level density and photon strength functions. The capture cross section was determined from 1.8 eV to 0.97 MeV, the broadest neutron-energy range ever measured for this isotope. Several new resonances have been observed. The statistical <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mi>γ</g:mi></g:math> decay of <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mmultiscripts><h:mi>Tm</h:mi><h:mprescripts/><h:none/><h:mn>170</h:mn></h:mmultiscripts></h:math> cannot be reproduced without a scissors mode resonance centered at <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\"><i:mrow><i:mo>≈</i:mo><i:mn>3.3</i:mn><i:mspace width=\"0.28em\"/><i:mi>MeV</i:mi></i:mrow></i:math>. The measured cross section in the unresolved-resonance region is generally lower than the latest evaluations. The derived <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\"><k:mmultiscripts><k:mi>Tm</k:mi><k:mprescripts/><k:none/><k:mn>169</k:mn></k:mmultiscripts><k:mo> </k:mo><k:mi>s</k:mi></k:math>-process abundance is expected to increase by a factor of 1.26, while the changes of the abundances of elements heavier than <l:math xmlns:l=\"http://www.w3.org/1998/Math/MathML\"><l:mmultiscripts><l:mi>Tm</l:mi><l:mprescripts/><l:none/><l:mn>169</l:mn><","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147917554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. J. deBoer, A. Junghans, R. Arquette, D. Bemmerer, A. Best, R. Beyer, A. Boeltzig, Gregory Clarke, J. Görres, T. Hensel, M. Matney, S. Müller, D. Rapagnani, A. Roberts, K. Römer, S. Turkat, Konrad Schmidt, J. Skowronski, A. Wagner, M. Wiescher, Anup Yadav
The reaction $^{14}$N$(n,p)^{14}$C is one of the main neutron poisons during $s$-process nucleosynthesis. In addition, the reaction provides insight into the yields of atmospheric nuclear weapon testing. Because of their high level of sensitivity, total neutron cross sections provide a great deal of constraint on the modeling of reaction cross sections through the $R$-matrix analyses used for nuclear data evaluations. Yet for $^{14}$N+$n$, only one high sensitivity measurement is available and it lacks detailed information about its experimental conditions and uncertainties. With these motivations in mind, a new measurement of the $^{14}$N+$n$ total cross section has been performed at the nELBE facility. The cross sections were found to be in good agreement with previous data over much of the energy range with the key exception of the lowest energy resonance at a neutron energy of 433 keV.
反应$^{14}$N$(N,p)^{14}$C是$ 5 $过程核合成过程中的主要中子中毒之一。此外，该反应提供了对大气核武器试验的产量的深入了解。由于它们的高灵敏度，总中子截面为通过用于核数据评估的R矩阵分析的反应截面建模提供了很大的约束。然而，对于$^{14}$N+$ N $，只有一种高灵敏度测量可用，并且缺乏有关其实验条件和不确定度的详细信息。考虑到这些动机，在nELBE设施进行了$^{14}$N+$ N $总截面的新测量。除了中子能量为433 keV的最低能量共振外，这些截面与以前的大部分能量范围的数据都很吻合。
{"title":"Total cross section of <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant=\"normal\">N</mml:mi><mml:mprescripts/><mml:none/><mml:mn>14</mml:mn></mml:mmultiscripts><mml:mspace width=\"0.16em\"/><mml:mo>+</mml:mo><mml:mspace width=\"0.16em\"/><mml:mi>n</mml:mi></mml:mrow></mml:math> from 0.1 to 12 MeV","authors":"R. J. deBoer, A. Junghans, R. Arquette, D. Bemmerer, A. Best, R. Beyer, A. Boeltzig, Gregory Clarke, J. Görres, T. Hensel, M. Matney, S. Müller, D. Rapagnani, A. Roberts, K. Römer, S. Turkat, Konrad Schmidt, J. Skowronski, A. Wagner, M. Wiescher, Anup Yadav","doi":"10.1103/frgb-j5c3","DOIUrl":"https://doi.org/10.1103/frgb-j5c3","url":null,"abstract":"The reaction $^{14}$N$(n,p)^{14}$C is one of the main neutron poisons during $s$-process nucleosynthesis. In addition, the reaction provides insight into the yields of atmospheric nuclear weapon testing. Because of their high level of sensitivity, total neutron cross sections provide a great deal of constraint on the modeling of reaction cross sections through the $R$-matrix analyses used for nuclear data evaluations. Yet for $^{14}$N+$n$, only one high sensitivity measurement is available and it lacks detailed information about its experimental conditions and uncertainties. With these motivations in mind, a new measurement of the $^{14}$N+$n$ total cross section has been performed at the nELBE facility. The cross sections were found to be in good agreement with previous data over much of the energy range with the key exception of the lowest energy resonance at a neutron energy of 433 keV.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"112 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://arxiv.org/pdf/2505.04995","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147906071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The ($n,ensuremath{gamma}$) cross section of the nuclide $^{168}mathrm{Yb}$, which is one of 35 $p$-nuclei, plays an important role in nuclear astrophysics network calculations. The $^{168}mathrm{Yb}$ resonance parameters, ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ and ${mathrm{ensuremath{Gamma}}}_{n}$, show significant discrepancies between these evaluated nuclear data libraries, while existing experimental data remain insufficient to resolve them. In this study, the ($n,ensuremath{gamma}$) yield of $^{mathrm{nat}}mathrm{Yb}$ is measured at the Back-n facility of the Chinese Spallation Neutron Source using the time-of-flight method. The ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ and ${mathrm{ensuremath{Gamma}}}_{n}$ parameters of $^{168}mathrm{Yb}$ are extracted by the multilevel $R$-matrix Bayesian code sammywithin the energy range of 0.1--300 eV. Both the ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ and ${mathrm{ensuremath{Gamma}}}_{n}$ parameters at three resonance peaks of 0.58, 22.53, and 27.17 eV are obtained successfully. Among them, the ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ value at 27.17 eV is experimentally extracted to be 65.88 $ifmmodepmelsetextpmfi{}$ 5.80 meV for the first time. These resonance results are further compared with the available evaluated and experimental data. It is found that the extracted ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ values are in good agreement with the nuclear data libraries ENDF/B-VIII.0, JENDL-4.0, BROND-3.1, and JEFF-3.3. Meanwhile, the extracted ${mathrm{ensuremath{Gamma}}}_{n}$ value at 0.58 eV is consistent with TENDL-2019, whereas the ${mathrm{ensuremath{Gamma}}}_{n}$ values at two other resonance peaks are different from the existing data. These findings enrich the experimental data of the $^{168}mathrm{Yb}$ neutron capture resonance and emphasize the importance of selecting appropriate nuclear data libraries.
{"title":"Experimental extraction of neutron resonance parameters at 0.1–300 eV for <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi>Yb</mml:mi><mml:mprescripts/><mml:none/><mml:mn>168</mml:mn></mml:mmultiscripts></mml:math>","authors":"Yaju Chen, Xinxiang Li, Wei Jiang, Jie Ren, Wen Xie, Hongwei Wang, Gong-Tao Fan, L.X. Liu, Yue Zhang, Zi-Ang Lin, Ting Jiang, Zhi-Cai Li, Kaijun Luo, Xiao-Ming Shi, Xian-Kai Li, Zongwei Cao, Gaole Yang, Zhen-Dong An, Bing Jiang, Wen Luo","doi":"10.1103/physrevc.111.054607","DOIUrl":"https://doi.org/10.1103/physrevc.111.054607","url":null,"abstract":"The ($n,ensuremath{gamma}$) cross section of the nuclide $^{168}mathrm{Yb}$, which is one of 35 $p$-nuclei, plays an important role in nuclear astrophysics network calculations. The $^{168}mathrm{Yb}$ resonance parameters, ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ and ${mathrm{ensuremath{Gamma}}}_{n}$, show significant discrepancies between these evaluated nuclear data libraries, while existing experimental data remain insufficient to resolve them. In this study, the ($n,ensuremath{gamma}$) yield of $^{mathrm{nat}}mathrm{Yb}$ is measured at the Back-n facility of the Chinese Spallation Neutron Source using the time-of-flight method. The ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ and ${mathrm{ensuremath{Gamma}}}_{n}$ parameters of $^{168}mathrm{Yb}$ are extracted by the multilevel $R$-matrix Bayesian code sammywithin the energy range of 0.1--300 eV. Both the ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ and ${mathrm{ensuremath{Gamma}}}_{n}$ parameters at three resonance peaks of 0.58, 22.53, and 27.17 eV are obtained successfully. Among them, the ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ value at 27.17 eV is experimentally extracted to be 65.88 $ifmmodepmelsetextpmfi{}$ 5.80 meV for the first time. These resonance results are further compared with the available evaluated and experimental data. It is found that the extracted ${mathrm{ensuremath{Gamma}}}_{ensuremath{gamma}}$ values are in good agreement with the nuclear data libraries ENDF/B-VIII.0, JENDL-4.0, BROND-3.1, and JEFF-3.3. Meanwhile, the extracted ${mathrm{ensuremath{Gamma}}}_{n}$ value at 0.58 eV is consistent with TENDL-2019, whereas the ${mathrm{ensuremath{Gamma}}}_{n}$ values at two other resonance peaks are different from the existing data. These findings enrich the experimental data of the $^{168}mathrm{Yb}$ neutron capture resonance and emphasize the importance of selecting appropriate nuclear data libraries.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"111 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147891277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-27DOI: 10.1103/physrevc.111.024620
Antònia Verdera, J. Praena, F. Arias de Saavedra, A. Roldán, M. Macías, Cristiano Lino Fontana, C. Bonaldi, W. Geerts, S. Oberstedt
Neutron production by the $^{51}mathrm{V}(p,n)^{51}mathrm{Cr}$ reaction close to the reaction threshold is interesting for its pure production of neutrons at low kiloelectronvolts. In this work, for the first time, the angle-dependent neutron spectrum is measured close to the threshold, particularly at 1585 keV proton energy, only 20 keV above the reaction threshold. The experiment was performed at the MONNET facility (JRC-Geel), employing the time-of-flight technique and a thick vanadium target. The $^{7}mathrm{Li}(p,n)^{7}mathrm{Be}$ reaction near the threshold was also measured and used as a reference and in a neutron transmission measurement for self-absorption correction. The angular-dependent energy spectra for the $^{51}mathrm{V}(p,n)^{51}mathrm{Cr}$ have been obtained and the integrated energy spectrum is presented. Their resulting spectrum reveals a pronounce peak at (6.49 $ifmmodepmelsetextpmfi{}$ 0.04) keV.
{"title":"Measurement of the neutron spectrum of the <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant=\"normal\">V</mml:mi><mml:mprescripts/><mml:none/><mml:mn>51</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi>Cr</mml:mi><mml:mprescripts/><mml:none/><mml:mn>51</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> reaction at 1585 keV","authors":"Antònia Verdera, J. Praena, F. Arias de Saavedra, A. Roldán, M. Macías, Cristiano Lino Fontana, C. Bonaldi, W. Geerts, S. Oberstedt","doi":"10.1103/physrevc.111.024620","DOIUrl":"https://doi.org/10.1103/physrevc.111.024620","url":null,"abstract":"Neutron production by the $^{51}mathrm{V}(p,n)^{51}mathrm{Cr}$ reaction close to the reaction threshold is interesting for its pure production of neutrons at low kiloelectronvolts. In this work, for the first time, the angle-dependent neutron spectrum is measured close to the threshold, particularly at 1585 keV proton energy, only 20 keV above the reaction threshold. The experiment was performed at the MONNET facility (JRC-Geel), employing the time-of-flight technique and a thick vanadium target. The $^{7}mathrm{Li}(p,n)^{7}mathrm{Be}$ reaction near the threshold was also measured and used as a reference and in a neutron transmission measurement for self-absorption correction. The angular-dependent energy spectra for the $^{51}mathrm{V}(p,n)^{51}mathrm{Cr}$ have been obtained and the integrated energy spectrum is presented. Their resulting spectrum reveals a pronounce peak at (6.49 $ifmmodepmelsetextpmfi{}$ 0.04) keV.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"111 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://digibug.ugr.es/bitstream/10481/104991/1/Vanadium_TOF_experiment____PAPER-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147913605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevc.110.064619
F. García-Infantes, J Praena, A. Casanovas, R. Henkelmann, U. Köster, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, H. Amar Es-Sghir, J. Andrzejewski, V. Babiano-Suárez, M. Bacak, J. Balibrea-Correa, S. Bennett, A. P. Bernardes, E. Berthoumieux, D. Bosnar, M. Busso, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, D. M. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. Console Camprini, G. Cortés, M. A. Cortés‐Giraldo, L. Cosentino, S. Cristallo, Mario Di Castro, Domenico Diacono, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, S. Fargier, B. Fernández–Domínguez, P. Finocchiaro, S. Fiore, V. Furman, A. Gawlik-Ramięga, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, D. G. Jenkins, E. Jericha, A. Junghans, Yacine Kadi, Tatsuya Katabuchi, I. Knapová, M. Kokkoris, Yu. N. Kopatch, M. Krtička, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, Giuseppe Lerner, A. Manna, T. Martínez, M. Martínez-Cañada, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V. Michalopoulou, P. M. Milazzo, R. Mucciola, F. Murtas, E. González-Romero, A. Musumarra, A Negret, A. Oprea, P. Pérez-Maroto, N. Patronis, J. A. Pavón-Rodríguez, M. G. Pellegriti, J. Perkowski, C. Petrone, L. Piersanti, E. Pirovano, S. Pomp, I. Porras, Nicoletta Protti, J. M. Quesada, T. Rauscher, R. Reifarth, D. Rochman, Y. Romanets, F. Romanò, C. Rubbia, A. Sánchez-Caballero, M. Sabaté-Gilarte, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, M. Spelta, M. E. Stamati, G. Tagliente, A. Tarifeño-Saldivia, D. Tarrío, Nicholas Terranova, P. Torres-Sánchez, S. Urlaß, S. Valenta, V. Variale, P. Vaz, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, P. Žugec
The <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mmultiscripts><a:mi>Yb</a:mi><a:mprescripts/><a:none/><a:mn>176</a:mn></a:mmultiscripts><a:mo>(</a:mo><a:mi>n</a:mi><a:mo>,</a:mo><a:mi>γ</a:mi><a:mo>)</a:mo><a:mmultiscripts><a:mi>Yb</a:mi><a:mprescripts/><a:none/><a:mn>177</a:mn></a:mmultiscripts><a:mo>→</a:mo><a:mmultiscripts><a:mi>Lu</a:mi><a:mprescripts/><a:none/><a:mn>177</a:mn></a:mmultiscripts></a:mrow></a:math> reaction is of interest in nuclear medicine as it is the preferred production route for <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Lu</b:mi><b:mprescripts/><b:none/><b:mn>177</b:mn></b:mmultiscripts></b:math>. This radioisotope has seen a very fast growth of usage in nuclear medicine in recent years due to its outstanding properties. New data on this reaction could provide useful information for production at new facilities. We aim to resolve resonances in the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mmultiscripts><c:mi>Yb</c:mi><c:mprescripts/><c:none/><c:mn>176</c:mn></c:mmultiscripts><c:mo>(</c:mo><c:mi>n</c:mi><c:mo>,</c:mo><c:mi>γ</c:mi><c:mo>)</c:mo><c:mmultiscripts><c:mi>Yb</c:mi><c:mprescripts/><c:none/><c:mn>177</c:mn></c:mmultiscripts></c:mrow></c:math> reaction for the first time. Previous capture measurement provided data at thermal point and encompassed integral measurements in the range from 3 keV to 1 MeV, where three time-of-flight measurements are available, but with low resolution to resolve the resonances. Transmission measurements from the 1970s resolved and analyzed some resonances. We measure the neutron capture cross section of <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mrow><d:mmultiscripts><d:mi>Yb</d:mi><d:mprescripts/><d:none/><d:mn>176</d:mn></d:mmultiscripts><d:mo>(</d:mo><d:mi>n</d:mi><d:mo>,</d:mo><d:mi>γ</d:mi><d:mo>)</d:mo><d:mmultiscripts><d:mi>Yb</d:mi><d:mprescripts/><d:none/><d:mn>177</d:mn></d:mmultiscripts></d:mrow></d:math> by means of the time-of-flight technique at the Experimental Area 1 of the n_TOF facility at CERN using an enriched <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mrow><e:munder><e:mmultiscripts><e:mi>Yb</e:mi><e:mprescripts/><e:none/><e:mn>176</e:mn></e:mmultiscripts><e:mn>2</e:mn></e:munder><e:msub><e:mi mathvariant="normal">O</e:mi><e:mn>3</e:mn></e:msub></e:mrow></e:math> sample and an array of four <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"><g:mrow><g:msub><g:mi mathvariant="normal">C</g:mi><g:mn>6</g:mn></g:msub><g:msub><g:mi mathvariant="normal">D</g:mi><g:mn>6</g:mn></g:msub></g:mrow></g:math> liquid scintillation detectors. We have resolved 164 resonances up to 21 keV, including 96 new ones. We also provide new capture experimental data from 90 eV to 3 keV, and we extend the resolved resonance region up to 21 keV. In addition, resonance decay widths, <j:math xmlns:j="http://www.w3.org/1998/Math/MathML"><j:msub><j:mi mathvariant="normal">Γ</j:mi><j:mi>γ</j:mi><
{"title":"Measurement of the <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi>Yb</mml:mi><mml:mprescripts/><mml:none/><mml:mn>176</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> cross section at the n_TOF facility at CERN","authors":"F. García-Infantes, J Praena, A. Casanovas, R. Henkelmann, U. Köster, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, H. Amar Es-Sghir, J. Andrzejewski, V. Babiano-Suárez, M. Bacak, J. Balibrea-Correa, S. Bennett, A. P. Bernardes, E. Berthoumieux, D. Bosnar, M. Busso, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, D. M. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. Console Camprini, G. Cortés, M. A. Cortés‐Giraldo, L. Cosentino, S. Cristallo, Mario Di Castro, Domenico Diacono, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, S. Fargier, B. Fernández–Domínguez, P. Finocchiaro, S. Fiore, V. Furman, A. Gawlik-Ramięga, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, D. G. Jenkins, E. Jericha, A. Junghans, Yacine Kadi, Tatsuya Katabuchi, I. Knapová, M. Kokkoris, Yu. N. Kopatch, M. Krtička, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, Giuseppe Lerner, A. Manna, T. Martínez, M. Martínez-Cañada, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V. Michalopoulou, P. M. Milazzo, R. Mucciola, F. Murtas, E. González-Romero, A. Musumarra, A Negret, A. Oprea, P. Pérez-Maroto, N. Patronis, J. A. Pavón-Rodríguez, M. G. Pellegriti, J. Perkowski, C. Petrone, L. Piersanti, E. Pirovano, S. Pomp, I. Porras, Nicoletta Protti, J. M. Quesada, T. Rauscher, R. Reifarth, D. Rochman, Y. Romanets, F. Romanò, C. Rubbia, A. Sánchez-Caballero, M. Sabaté-Gilarte, P. Schillebeeckx, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, M. Spelta, M. E. Stamati, G. Tagliente, A. Tarifeño-Saldivia, D. Tarrío, Nicholas Terranova, P. Torres-Sánchez, S. Urlaß, S. Valenta, V. Variale, P. Vaz, D. Vescovi, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, P. Žugec","doi":"10.1103/physrevc.110.064619","DOIUrl":"https://doi.org/10.1103/physrevc.110.064619","url":null,"abstract":"The <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\"><a:mrow><a:mmultiscripts><a:mi>Yb</a:mi><a:mprescripts/><a:none/><a:mn>176</a:mn></a:mmultiscripts><a:mo>(</a:mo><a:mi>n</a:mi><a:mo>,</a:mo><a:mi>γ</a:mi><a:mo>)</a:mo><a:mmultiscripts><a:mi>Yb</a:mi><a:mprescripts/><a:none/><a:mn>177</a:mn></a:mmultiscripts><a:mo>→</a:mo><a:mmultiscripts><a:mi>Lu</a:mi><a:mprescripts/><a:none/><a:mn>177</a:mn></a:mmultiscripts></a:mrow></a:math> reaction is of interest in nuclear medicine as it is the preferred production route for <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mmultiscripts><b:mi>Lu</b:mi><b:mprescripts/><b:none/><b:mn>177</b:mn></b:mmultiscripts></b:math>. This radioisotope has seen a very fast growth of usage in nuclear medicine in recent years due to its outstanding properties. New data on this reaction could provide useful information for production at new facilities. We aim to resolve resonances in the <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mmultiscripts><c:mi>Yb</c:mi><c:mprescripts/><c:none/><c:mn>176</c:mn></c:mmultiscripts><c:mo>(</c:mo><c:mi>n</c:mi><c:mo>,</c:mo><c:mi>γ</c:mi><c:mo>)</c:mo><c:mmultiscripts><c:mi>Yb</c:mi><c:mprescripts/><c:none/><c:mn>177</c:mn></c:mmultiscripts></c:mrow></c:math> reaction for the first time. Previous capture measurement provided data at thermal point and encompassed integral measurements in the range from 3 keV to 1 MeV, where three time-of-flight measurements are available, but with low resolution to resolve the resonances. Transmission measurements from the 1970s resolved and analyzed some resonances. We measure the neutron capture cross section of <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mrow><d:mmultiscripts><d:mi>Yb</d:mi><d:mprescripts/><d:none/><d:mn>176</d:mn></d:mmultiscripts><d:mo>(</d:mo><d:mi>n</d:mi><d:mo>,</d:mo><d:mi>γ</d:mi><d:mo>)</d:mo><d:mmultiscripts><d:mi>Yb</d:mi><d:mprescripts/><d:none/><d:mn>177</d:mn></d:mmultiscripts></d:mrow></d:math> by means of the time-of-flight technique at the Experimental Area 1 of the n_TOF facility at CERN using an enriched <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:munder><e:mmultiscripts><e:mi>Yb</e:mi><e:mprescripts/><e:none/><e:mn>176</e:mn></e:mmultiscripts><e:mn>2</e:mn></e:munder><e:msub><e:mi mathvariant=\"normal\">O</e:mi><e:mn>3</e:mn></e:msub></e:mrow></e:math> sample and an array of four <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mrow><g:msub><g:mi mathvariant=\"normal\">C</g:mi><g:mn>6</g:mn></g:msub><g:msub><g:mi mathvariant=\"normal\">D</g:mi><g:mn>6</g:mn></g:msub></g:mrow></g:math> liquid scintillation detectors. We have resolved 164 resonances up to 21 keV, including 96 new ones. We also provide new capture experimental data from 90 eV to 3 keV, and we extend the resolved resonance region up to 21 keV. In addition, resonance decay widths, <j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\"><j:msub><j:mi mathvariant=\"normal\">Γ</j:mi><j:mi>γ</j:mi><","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"110 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147891349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-17DOI: 10.1103/physrevc.110.065805
N. V. Sosnin, C. Lederer-Woods, R. Garg, U. Battino, S. Cristallo, M. Dietz, S. Heinitz, M. Krtička, R. Reifarth, S. Valenta, D. Vescovi, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Bécares, V. Babiano-Suárez, M. Bacak, M. Barbagallo, F. Bečvář, G. Bellia, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés‐Giraldo, L. Coséntino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, B. Fernández–Domínguez, Andrea Ferrari, P. Finocchiaro, V. Furman, K. Göbel, A. Gawlik-Ramięga, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, Hideo Harada, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Yacine Kadi, Akira Kimura, N. Kivel, M. Kokkoris, Yu. N. Kopatch, D. Kurtulgil, I. Ladarescu, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S. J. Lonsdale, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V. Michalopoulou, P. M. Milazzo, A. St. J. Murphy, A. Musumarra, A. Negreţ, R. Nolte, F. Ogállar, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, L. Piersanti, I. Porras, J. Praena, J. M. Quesada, D. Radeck, D. Ramos-Doval, T. Rauscher, D. Rochman, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. G. Smith, A. Stamatopoulos, G. Tagliente, J. L. Taı́n, T. Talip, A. Tarifeño-Saldivia, L. Tassan-Gôt, P. Torres-Sánchez, A. Tsinganis, J. Ulrich, S. Urlaß, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, P. Žugec
The Se78(n,γ)Se79 cross section has a high impact on the abundances of Se78 produced during the slow neutron capture process (s process) in massive stars. A measurement of the Se78 radiative neutron capture cross section has been performed at the Neutron Time-of-Flight facility at CERN using a set of liquid scintillation detectors that have been optimized for a low sensitivity to neutrons. We present resonance capture kernels up to 70 keV and cross section from 70 to 600 keV. Maxwellian-averaged cross section (MACS) values were calculated for stellar temperatures between kT=5 and 100 keV, with uncertainties between 4.6% and 5.8%. The new MACS values result in substantial decreases of 20–30% of Se78 abundances produced in the s process in massive stars and AGB stars. Massive stars are now predicted to produce subsolar Se78/Se76 ratios, which is expected since Se76 is an s-only isotope, while solar Se78 abundances have also contributions from other nucleosynthesis processes. Published by the American Physical Society 2024
{"title":"Measurement of the <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mmultiscripts><mml:mi>Se</mml:mi><mml:mprescripts/><mml:none/><mml:mn>78</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi>Se</mml:mi><mml:mprescripts/><mml:none/><mml:mn>79</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> cross section up to 600 keV at the n_TOF facility at CERN","authors":"N. V. Sosnin, C. Lederer-Woods, R. Garg, U. Battino, S. Cristallo, M. Dietz, S. Heinitz, M. Krtička, R. Reifarth, S. Valenta, D. Vescovi, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Bécares, V. Babiano-Suárez, M. Bacak, M. Barbagallo, F. Bečvář, G. Bellia, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés‐Giraldo, L. Coséntino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, B. Fernández–Domínguez, Andrea Ferrari, P. Finocchiaro, V. Furman, K. Göbel, A. Gawlik-Ramięga, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, Hideo Harada, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Yacine Kadi, Akira Kimura, N. Kivel, M. Kokkoris, Yu. N. Kopatch, D. Kurtulgil, I. Ladarescu, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S. J. Lonsdale, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, V. Michalopoulou, P. M. Milazzo, A. St. J. Murphy, A. Musumarra, A. Negreţ, R. Nolte, F. Ogállar, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, L. Piersanti, I. Porras, J. Praena, J. M. Quesada, D. Radeck, D. Ramos-Doval, T. Rauscher, D. Rochman, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. G. Smith, A. Stamatopoulos, G. Tagliente, J. L. Taı́n, T. Talip, A. Tarifeño-Saldivia, L. Tassan-Gôt, P. Torres-Sánchez, A. Tsinganis, J. Ulrich, S. Urlaß, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, P. Žugec","doi":"10.1103/physrevc.110.065805","DOIUrl":"https://doi.org/10.1103/physrevc.110.065805","url":null,"abstract":"The <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\"><a:mrow><a:mmultiscripts><a:mi>Se</a:mi><a:mprescripts/><a:none/><a:mn>78</a:mn></a:mmultiscripts><a:mo>(</a:mo><a:mi>n</a:mi><a:mo>,</a:mo><a:mi>γ</a:mi><a:mo>)</a:mo><a:mmultiscripts><a:mi>Se</a:mi><a:mprescripts/><a:none/><a:mn>79</a:mn></a:mmultiscripts></a:mrow></a:math> cross section has a high impact on the abundances of <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mmultiscripts><b:mi>Se</b:mi><b:mprescripts/><b:none/><b:mn>78</b:mn></b:mmultiscripts></b:math> produced during the slow neutron capture process (<c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mi>s</c:mi></c:math> process) in massive stars. A measurement of the <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mmultiscripts><d:mi>Se</d:mi><d:mprescripts/><d:none/><d:mn>78</d:mn></d:mmultiscripts></d:math> radiative neutron capture cross section has been performed at the Neutron Time-of-Flight facility at CERN using a set of liquid scintillation detectors that have been optimized for a low sensitivity to neutrons. We present resonance capture kernels up to 70 keV and cross section from 70 to 600 keV. Maxwellian-averaged cross section (MACS) values were calculated for stellar temperatures between <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:mi>k</e:mi><e:mi>T</e:mi><e:mo>=</e:mo><e:mn>5</e:mn></e:mrow></e:math> and 100 keV, with uncertainties between 4.6% and 5.8%. The new MACS values result in substantial decreases of 20–30% of <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"><f:mmultiscripts><f:mi>Se</f:mi><f:mprescripts/><f:none/><f:mn>78</f:mn></f:mmultiscripts></f:math> abundances produced in the <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mi>s</g:mi></g:math> process in massive stars and AGB stars. Massive stars are now predicted to produce subsolar <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mrow><h:mmultiscripts><h:mi>Se</h:mi><h:mprescripts/><h:none/><h:mn>78</h:mn></h:mmultiscripts><h:mo>/</h:mo><h:mmultiscripts><h:mi>Se</h:mi><h:mprescripts/><h:none/><h:mn>76</h:mn></h:mmultiscripts></h:mrow></h:math> ratios, which is expected since <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\"><i:mmultiscripts><i:mi>Se</i:mi><i:mprescripts/><i:none/><i:mn>76</i:mn></i:mmultiscripts></i:math> is an <j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\"><j:mi>s</j:mi></j:math>-only isotope, while solar <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\"><k:mmultiscripts><k:mi>Se</k:mi><k:mprescripts/><k:none/><k:mn>78</k:mn></k:mmultiscripts></k:math> abundances have also contributions from other nucleosynthesis processes. Published by the American Physical Society 2024","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"110 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147910909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-21DOI: 10.1103/physrevc.110.054321
M. Stepaniuk, M. Karny, A. Fijałkowska, K. P. Rykaczewski, B. C. Rasco, R. Grzywacz, M. Wolińska-Cichocka, J. M. Allmond, J. C. Batchelder, C. R. Bingham, J. C. Blackmon, N. T. Brewer, S. Go, K. C. Goetz, C. J. Gross, James W. Johnson, C. Jost, J. H. Hamilton, T. King, K. Kolos, J. T. Matta, K. Miernik, M. Madurga, D. Miller, C. D. Nesaraja, S. Padgett, S. V. Paulauskas, M. M. Rajabali, D. W. Stracener, E. H. Spejewski, S. Taylor, E. H. Wang, J. A. Winger, Yiming Xiao, E. F. Zganjar
The $ensuremath{beta}$ decays of $^{87}mathrm{Br}$, $^{88}mathrm{Br}$, and $^{87}mathrm{Kr}$ were measured with the Modular Total Absorption Spectrometer (MTAS) at Oak Ridge National Laboratory's Holifield Radioactive Ion Beam Facility (HRIBF). Both bromine isotopes are $ensuremath{beta}$-delayed neutron emitters that have large cumulative fission yields and were identified as top-priority cases for total absorption study by the Nuclear Energy Agency in 2007. Our investigations corroborate that the decay schemes of $^{87}mathrm{Br}$ and $^{88}mathrm{Br}$ suffer from the so-called pandemonium effect. Unique MTAS properties enable direct neutron measurements. We present MTAS-derived $ensuremath{beta}$-delayed neutron spectra, $ensuremath{beta}$-delayed neutron emission probabilities of ${P}_{n}(^{87}mathrm{Br})$ $=2.36(24)%$, and ${P}_{n}(^{88}mathrm{Br})$ $=6.4(6)%$, and the $ensuremath{beta}$-delayed neutron transitions intensity of 4(2)% to the first excited $^{87}mathrm{Kr}$ state, populated in the $ensuremath{beta}$-neutron decay of $^{88}mathrm{Br}$. Incorporating new data into calculations of the electromagnetic decay heat component emitted during thermal neutron fission of $^{235}mathrm{U}$ and $^{239}mathrm{Pu}$ improves agreement with experimental data up to approximately 80 s after fission. The estimation of the nuclear reactor ${overline{ensuremath{nu}}}_{e}$ flux results in changes of up to 1% in the expected ${overline{ensuremath{nu}}}_{e}$ interactions with the detector material for $^{235}mathrm{U}$, $^{238}mathrm{U}$, $^{239}mathrm{Pu}$, and $^{241}mathrm{Pu}$.
{"title":"Decay studies of the <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mi>β</mml:mi></mml:math>-delayed neutron emitters <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi>Br</mml:mi><mml:mprescripts/><mml:none/><mml:mn>87</mml:mn></mml:mmultiscripts></mml:math> and <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mmultiscripts><mml:mi>Br</mml:mi><mml:mprescripts/><mml:none/><mml:mn>88</mml:mn></mml:mmultiscripts></mml:math> measured by means of the Modular Total Absorption Spectrometer at ORNL HRIBF","authors":"M. Stepaniuk, M. Karny, A. Fijałkowska, K. P. Rykaczewski, B. C. Rasco, R. Grzywacz, M. Wolińska-Cichocka, J. M. Allmond, J. C. Batchelder, C. R. Bingham, J. C. Blackmon, N. T. Brewer, S. Go, K. C. Goetz, C. J. Gross, James W. Johnson, C. Jost, J. H. Hamilton, T. King, K. Kolos, J. T. Matta, K. Miernik, M. Madurga, D. Miller, C. D. Nesaraja, S. Padgett, S. V. Paulauskas, M. M. Rajabali, D. W. Stracener, E. H. Spejewski, S. Taylor, E. H. Wang, J. A. Winger, Yiming Xiao, E. F. Zganjar","doi":"10.1103/physrevc.110.054321","DOIUrl":"https://doi.org/10.1103/physrevc.110.054321","url":null,"abstract":"The $ensuremath{beta}$ decays of $^{87}mathrm{Br}$, $^{88}mathrm{Br}$, and $^{87}mathrm{Kr}$ were measured with the Modular Total Absorption Spectrometer (MTAS) at Oak Ridge National Laboratory's Holifield Radioactive Ion Beam Facility (HRIBF). Both bromine isotopes are $ensuremath{beta}$-delayed neutron emitters that have large cumulative fission yields and were identified as top-priority cases for total absorption study by the Nuclear Energy Agency in 2007. Our investigations corroborate that the decay schemes of $^{87}mathrm{Br}$ and $^{88}mathrm{Br}$ suffer from the so-called pandemonium effect. Unique MTAS properties enable direct neutron measurements. We present MTAS-derived $ensuremath{beta}$-delayed neutron spectra, $ensuremath{beta}$-delayed neutron emission probabilities of ${P}_{n}(^{87}mathrm{Br})$ $=2.36(24)%$, and ${P}_{n}(^{88}mathrm{Br})$ $=6.4(6)%$, and the $ensuremath{beta}$-delayed neutron transitions intensity of 4(2)% to the first excited $^{87}mathrm{Kr}$ state, populated in the $ensuremath{beta}$-neutron decay of $^{88}mathrm{Br}$. Incorporating new data into calculations of the electromagnetic decay heat component emitted during thermal neutron fission of $^{235}mathrm{U}$ and $^{239}mathrm{Pu}$ improves agreement with experimental data up to approximately 80 s after fission. The estimation of the nuclear reactor ${overline{ensuremath{nu}}}_{e}$ flux results in changes of up to 1% in the expected ${overline{ensuremath{nu}}}_{e}$ interactions with the detector material for $^{235}mathrm{U}$, $^{238}mathrm{U}$, $^{239}mathrm{Pu}$, and $^{241}mathrm{Pu}$.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"110 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://escholarship.org/content/qt2c12d284/qt2c12d284.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147914531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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