Pub Date : 2026-01-01Epub Date: 2026-04-20DOI: 10.1140/epjti/s40485-026-00121-1
Allison Chu, Yiming Liu, Matthew Needham
To make precision particle mass measurements in charged spectrometers detailed understanding of the influence of detector effects is critical. In this paper the influence of detector-related uncertainties on the determination of the parent particle mass in two-body decays is investigated. It is shown how the dependence of observed mass shifts on the sum and difference of the daughter particle momenta can be used to determine the physical causes of a bias more rigorously than the ad hoc rules that are often adopted. The approach is illustrated using the case of measuring the Λ hyperon mass. This observable is of interest because our current knowledge relies on information from a single experiment that has not been updated to account for changes in the value of the mass used for calibration. With the approach developed in the paper it shown that the LHCb experiment has the capability to make a measurement of the Λ mass with systematic uncertainties from the tracking system controlled to 0.7 keV/ . This allows a total precision of 2.2 keV/ to be achieved, dominated by the knowledge of the mass used for calibration. This would improve the current knowledge of the Λ hyperon mass by a factor of three.
要在带电光谱仪中进行精确的粒子质量测量，详细了解探测器效应的影响至关重要。本文研究了双体衰变中探测器相关不确定度对母粒子质量测定的影响。它显示了观测到的质量位移对子粒子动量的和和差的依赖如何能够比通常采用的特别规则更严格地用于确定偏差的物理原因。用测量Λ超子质量的例子说明了这种方法。这一观测结果令人感兴趣，因为我们目前的知识依赖于单个实验的信息，而这些信息尚未更新，以解释用于校准的K s 0质量值的变化。本文提出的方法表明，LHCb实验具有测量Λ质量的能力，跟踪系统的系统不确定度控制在0.7 keV/ c2以内。这可以实现2.2 keV/ c2的总精度，主要是用于校准的K s 0质量的知识。这将使目前对Λ超子质量的认识提高三倍。
{"title":"Improving systematic uncertainties on precision two-body mass measurements.","authors":"Allison Chu, Yiming Liu, Matthew Needham","doi":"10.1140/epjti/s40485-026-00121-1","DOIUrl":"10.1140/epjti/s40485-026-00121-1","url":null,"abstract":"<p><p>To make precision particle mass measurements in charged spectrometers detailed understanding of the influence of detector effects is critical. In this paper the influence of detector-related uncertainties on the determination of the parent particle mass in two-body decays is investigated. It is shown how the dependence of observed mass shifts on the sum and difference of the daughter particle momenta can be used to determine the physical causes of a bias more rigorously than the <i>ad hoc</i> rules that are often adopted. The approach is illustrated using the case of measuring the Λ hyperon mass. This observable is of interest because our current knowledge relies on information from a single experiment that has not been updated to account for changes in the value of the <math> <msubsup><mrow><mtext>K</mtext></mrow> <mtext>s</mtext> <mn>0</mn></msubsup> </math> mass used for calibration. With the approach developed in the paper it shown that the LHCb experiment has the capability to make a measurement of the Λ mass with systematic uncertainties from the tracking system controlled to 0.7 keV/ <math><msup><mi>c</mi> <mn>2</mn></msup> </math> . This allows a total precision of 2.2 keV/ <math><msup><mi>c</mi> <mn>2</mn></msup> </math> to be achieved, dominated by the knowledge of the <math> <msubsup><mrow><mtext>K</mtext></mrow> <mtext>s</mtext> <mn>0</mn></msubsup> </math> mass used for calibration. This would improve the current knowledge of the Λ hyperon mass by a factor of three.</p>","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":"13 1","pages":"3"},"PeriodicalIF":3.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13095980/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147784296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-05DOI: 10.1140/epjti/s40485-023-00105-5
Hiroaki Kumada, Takeji Sakae, Hideyuki Sakurai
Abstract Recently, progress in technology for accelerator-based neutron sources has increased attention regarding boron neutron capture therapy (BNCT). BNCT is a type of radiotherapy that combines neutrons and boron drugs and is expected to be used in the treatment of refractory and recurrent cancers. Owing to the need for high-intensity neutrons in treatment, compact accelerator-based neutron sources applicable to BNCT are being developed worldwide. These current projects utilize cyclotrons, linear accelerators, and electrostatic accelerators as accelerators for BNCT devices. Beryllium and lithium are the main target materials for neutron generation. The accelerators for BNCT device are required to accelerate charged particles with an average current ranging from a few milliamperes to a few tens of milliamperes in order to generate neutrons of sufficient intensity for the treatment. Moreover, the target systems require technologies and mechanisms that can withstand the large heat load produced by high-power beam irradiation and prevent blistering. This review outlines and explains the accelerator neutron sources for BNCT and the requirements for the components of each device, such as the accelerator, target material, and beam shaping assembly. In addition, various development projects for accelerator-based BNCT devices worldwide are introduced.
{"title":"Current development status of accelerator-based neutron source for boron neutron capture therapy","authors":"Hiroaki Kumada, Takeji Sakae, Hideyuki Sakurai","doi":"10.1140/epjti/s40485-023-00105-5","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00105-5","url":null,"abstract":"Abstract Recently, progress in technology for accelerator-based neutron sources has increased attention regarding boron neutron capture therapy (BNCT). BNCT is a type of radiotherapy that combines neutrons and boron drugs and is expected to be used in the treatment of refractory and recurrent cancers. Owing to the need for high-intensity neutrons in treatment, compact accelerator-based neutron sources applicable to BNCT are being developed worldwide. These current projects utilize cyclotrons, linear accelerators, and electrostatic accelerators as accelerators for BNCT devices. Beryllium and lithium are the main target materials for neutron generation. The accelerators for BNCT device are required to accelerate charged particles with an average current ranging from a few milliamperes to a few tens of milliamperes in order to generate neutrons of sufficient intensity for the treatment. Moreover, the target systems require technologies and mechanisms that can withstand the large heat load produced by high-power beam irradiation and prevent blistering. This review outlines and explains the accelerator neutron sources for BNCT and the requirements for the components of each device, such as the accelerator, target material, and beam shaping assembly. In addition, various development projects for accelerator-based BNCT devices worldwide are introduced.","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134975987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-19DOI: 10.1140/epjti/s40485-023-00104-6
Isaac J. Arnquist, Maria Laura di Vacri, Nicole Rocco, Richard Saldanha, Tyler Schlieder, Raj Patel, Jay Patil, Mario Perez, Harshad Uka
Abstract Flexible printed cables and circuitry based on copper-polyimide materials are widely used in experiments looking for rare events due to their unique electrical and mechanical characteristics. However, past studies have found copper-polyimide flexible cables to contain 400-4700 pg 238 U/g, 16-3700 pg 232 Th/g, and 170-2100 ng nat K/g, which can be a significant source of radioactive background for many current and next-generation ultralow background detectors. This study presents a comprehensive investigation into the fabrication process of copper-polyimide flexible cables and the development of custom low radioactivity cables for use in rare-event physics applications. A methodical step-by-step approach was developed and informed by ultrasensitive assay to determine the radiopurity in the starting materials and identify the contaminating production steps in the cable fabrication process. Radiopure material alternatives were identified, and cleaner production processes and treatments were developed to significantly reduce the imparted contamination. Through the newly developed radiopure fabrication process, fully-functioning cables were produced with radiocontaminant concentrations of 20-31 pg 238 U/g, 12-13 pg 232 Th/g, and 40-550 ng nat K/g, which is significantly cleaner than cables from previous work and sufficiently radiopure for current and next-generation detectors. This approach, employing witness samples to investigate each step of the fabrication process, can hopefully serve as a template for investigating radiocontaminants in other material production processes.
{"title":"Ultra-low radioactivity flexible printed cables","authors":"Isaac J. Arnquist, Maria Laura di Vacri, Nicole Rocco, Richard Saldanha, Tyler Schlieder, Raj Patel, Jay Patil, Mario Perez, Harshad Uka","doi":"10.1140/epjti/s40485-023-00104-6","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00104-6","url":null,"abstract":"Abstract Flexible printed cables and circuitry based on copper-polyimide materials are widely used in experiments looking for rare events due to their unique electrical and mechanical characteristics. However, past studies have found copper-polyimide flexible cables to contain 400-4700 pg 238 U/g, 16-3700 pg 232 Th/g, and 170-2100 ng nat K/g, which can be a significant source of radioactive background for many current and next-generation ultralow background detectors. This study presents a comprehensive investigation into the fabrication process of copper-polyimide flexible cables and the development of custom low radioactivity cables for use in rare-event physics applications. A methodical step-by-step approach was developed and informed by ultrasensitive assay to determine the radiopurity in the starting materials and identify the contaminating production steps in the cable fabrication process. Radiopure material alternatives were identified, and cleaner production processes and treatments were developed to significantly reduce the imparted contamination. Through the newly developed radiopure fabrication process, fully-functioning cables were produced with radiocontaminant concentrations of 20-31 pg 238 U/g, 12-13 pg 232 Th/g, and 40-550 ng nat K/g, which is significantly cleaner than cables from previous work and sufficiently radiopure for current and next-generation detectors. This approach, employing witness samples to investigate each step of the fabrication process, can hopefully serve as a template for investigating radiocontaminants in other material production processes.","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135014224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-13DOI: 10.1140/epjti/s40485-023-00103-7
M. Boscolo, F. Palla, F. Bosi, Francesco Fransesini, S. Lauciani
{"title":"Mechanical model for the FCC-ee interaction region","authors":"M. Boscolo, F. Palla, F. Bosi, Francesco Fransesini, S. Lauciani","doi":"10.1140/epjti/s40485-023-00103-7","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00103-7","url":null,"abstract":"","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41817544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-31DOI: 10.1140/epjti/s40485-023-00101-9
R. Frost, M. Elfman, K. Fissum, P. Kristiansson, N. Mauritzson, J. Pallon, G. Pédehontaa-Hiaa, H. Perrey, K. E. Stenström, A. Sjöland
{"title":"A compact accelerator driven neutron source at the Applied Nuclear Physics Laboratory, Lund University","authors":"R. Frost, M. Elfman, K. Fissum, P. Kristiansson, N. Mauritzson, J. Pallon, G. Pédehontaa-Hiaa, H. Perrey, K. E. Stenström, A. Sjöland","doi":"10.1140/epjti/s40485-023-00101-9","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00101-9","url":null,"abstract":"","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45349538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-17DOI: 10.1140/epjti/s40485-023-00100-w
N. Patronis, A. Mengoni, S. Goula, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, J. Andrzejewski, V. Babiano-Suárez, M. Bacak, J. Balibrea Correa, C. Beltrami, S. Bennett, A. Bernardes, E. Berthoumieux, R. Beyer, M. Boromiza, D. Bosnar, M. Caamano, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, D. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. C. Console Camprini, G. Cortes, M. Cortés-Giraldo, L. Cosentino, S. Cristallo, S. Dellmann, M. di Castro, S. Di Maria, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, S. Fargier, B. Fernández, B. Fernández-Domínguez, P. Finocchiaro, S. Fiore, F. Garcia-Infantes, A. Gawlik-Ramięga, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, W. Hillman, D. Jenkins, E. Jericha, A. Junghans, Y. Kadi, K. Kaperoni, G. Kaur, A. Kimura, I. Knapová, M. Kokkoris, M. Krticka, N. Kyritsis, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, G. Lerne
{"title":"Status report of the n_TOF facility after the 2nd CERN long shutdown period","authors":"N. Patronis, A. Mengoni, S. Goula, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, J. Andrzejewski, V. Babiano-Suárez, M. Bacak, J. Balibrea Correa, C. Beltrami, S. Bennett, A. Bernardes, E. Berthoumieux, R. Beyer, M. Boromiza, D. Bosnar, M. Caamano, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, D. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. C. Console Camprini, G. Cortes, M. Cortés-Giraldo, L. Cosentino, S. Cristallo, S. Dellmann, M. di Castro, S. Di Maria, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, S. Fargier, B. Fernández, B. Fernández-Domínguez, P. Finocchiaro, S. Fiore, F. Garcia-Infantes, A. Gawlik-Ramięga, G. Gervino, S. Gilardoni, E. González-Romero, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, W. Hillman, D. Jenkins, E. Jericha, A. Junghans, Y. Kadi, K. Kaperoni, G. Kaur, A. Kimura, I. Knapová, M. Kokkoris, M. Krticka, N. Kyritsis, I. Ladarescu, C. Lederer-Woods, J. Lerendegui-Marco, G. Lerne","doi":"10.1140/epjti/s40485-023-00100-w","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00100-w","url":null,"abstract":"","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42268977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-17DOI: 10.1140/epjti/s40485-023-00099-0
H. Kersten
{"title":"Diagnostics for electric propulsion systems","authors":"H. Kersten","doi":"10.1140/epjti/s40485-023-00099-0","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00099-0","url":null,"abstract":"","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42772361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-21DOI: 10.1140/epjti/s40485-023-00098-1
K. Ohshimo, Xi He, Ryosuke Ito, Kengo Tsunoda, Sota Tainaka, F. Misaizu
{"title":"Cryogenic ion mobility-mass spectrometry for the study of conformations of host-guest complexes","authors":"K. Ohshimo, Xi He, Ryosuke Ito, Kengo Tsunoda, Sota Tainaka, F. Misaizu","doi":"10.1140/epjti/s40485-023-00098-1","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00098-1","url":null,"abstract":"","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41603667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-17DOI: 10.1140/epjti/s40485-023-00097-2
F. Jansen, T. Andreussi, Giovanni Cesarretti, M. Ehresmann, Julia Grill, G. Herdrich, I. Funaki, Nathalie Girard, J. Grundmann, D. Krejci, H. Leiter, F. Masson, V. Maiwald, T. Misuri, S. Oriol, A. Piragino, A. Reissner, L. Schanz
{"title":"Cluster of electric thrusters for astronautic and robotic INPPS flagship space flights to Mars and Europa moon","authors":"F. Jansen, T. Andreussi, Giovanni Cesarretti, M. Ehresmann, Julia Grill, G. Herdrich, I. Funaki, Nathalie Girard, J. Grundmann, D. Krejci, H. Leiter, F. Masson, V. Maiwald, T. Misuri, S. Oriol, A. Piragino, A. Reissner, L. Schanz","doi":"10.1140/epjti/s40485-023-00097-2","DOIUrl":"https://doi.org/10.1140/epjti/s40485-023-00097-2","url":null,"abstract":"","PeriodicalId":44591,"journal":{"name":"EPJ Techniques and Instrumentation","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47374648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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