{"title":"GERDA searches for 0νββ and other ββ decay modes of 76Ge","authors":"A. Smolnikov","doi":"10.1063/1.5130985","DOIUrl":"https://doi.org/10.1063/1.5130985","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82856571","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}
N. Rukhadze, A. Barabash, V. Brudanin, A. Klimenko, S. Konovalov, A. Rakhimov, E. Rukhadze, Y. Shitov, I. Štekl, V. Umatov, G. Warot
{"title":"Investigation of β+EC, EC/EC processes in 74Se","authors":"N. Rukhadze, A. Barabash, V. Brudanin, A. Klimenko, S. Konovalov, A. Rakhimov, E. Rukhadze, Y. Shitov, I. Štekl, V. Umatov, G. Warot","doi":"10.1063/1.5130982","DOIUrl":"https://doi.org/10.1063/1.5130982","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84529802","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}
. The reactor antineutrino and the gallium anomalies have been long unexplained. Possible explanations for both of these anomalies include new physics, such as the existence of one or more eV-scale sterile neutrino. However, the previous theoretical calculations, which do not replicate the experimental results, rely on many simplifying approximations. We have performed shell model calculations in order to gain insights into these issues. In the reactor-antineutrino analysis the beta decays contributing to the cumulative electron spectrum are usually assumed to have allowed spectral shapes. However, many of these decays are actually first-forbidden. Moreover, these decays dominate the experimentally observable region. Based on the recent results, the use of this allowed approximation can at least partially explain the so called reactor antineurtino anomaly. Our new large-scale shell model calculations regarding the neutrino-nucleus scattering cross section off 71 Ga decreases the gap between theory and the experimental results of GALLEX and SAGE experiments. Conflict between charge-exchange BGTs and the neutrino-nucleus cross sections can to some extent be explained by destructive interference between Gamow-Teller and tensor contributions.
{"title":"Anomalies and sterile neutrinos – Implications of new theoretical results","authors":"J. Kostensalo, J. Suhonen","doi":"10.1063/1.5130977","DOIUrl":"https://doi.org/10.1063/1.5130977","url":null,"abstract":". The reactor antineutrino and the gallium anomalies have been long unexplained. Possible explanations for both of these anomalies include new physics, such as the existence of one or more eV-scale sterile neutrino. However, the previous theoretical calculations, which do not replicate the experimental results, rely on many simplifying approximations. We have performed shell model calculations in order to gain insights into these issues. In the reactor-antineutrino analysis the beta decays contributing to the cumulative electron spectrum are usually assumed to have allowed spectral shapes. However, many of these decays are actually first-forbidden. Moreover, these decays dominate the experimentally observable region. Based on the recent results, the use of this allowed approximation can at least partially explain the so called reactor antineurtino anomaly. Our new large-scale shell model calculations regarding the neutrino-nucleus scattering cross section off 71 Ga decreases the gap between theory and the experimental results of GALLEX and SAGE experiments. Conflict between charge-exchange BGTs and the neutrino-nucleus cross sections can to some extent be explained by destructive interference between Gamow-Teller and tensor contributions.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"117 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77038613","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}
J. M. López-Castaño, S. Alvis, I. Arnquist, F. T. AvignoneIII, A. Barabash, C. Barton, V. Basu, F. Bertrand, B. Bos, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Yuen-Dat Chan, Cabot-Ann Christofferson, Ph Chu, M. Clark, C. Cuesta, J. Detwiler, A. Drobizhev, D. Edwins, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. P. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, R. Hegedus, R. Henning, D. H. Aguilar, E. Hoppe, A. Hostiuc, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, E. L. Martin, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, T. Oli, G. Othman, W. Pettus, A. Piliounis, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, N. Ruof, B. Shanks, M. Shirchenko, D. Tedeschi, R. L. Varner, S. Vasilyev, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, C. H. Yu, V. Yumatov, I. Zhitnikov, B. Zhu
The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.
马约拉纳演示器正在用两个模块阵列的天然锗和富集76Ge的锗探测器寻找76Ge中的中微子双β衰变。它位于美国南达科他州铅市桑福德地下研究设施4850英尺的高度，其锗探测器总质量为44.1千克，其中29.7千克为富集。对前26 kg- year数据的分析提供了前所未有的能量分辨率0.13%，在2039 keV的感兴趣区域和15.4±2.0计数/(FWHM t yr)的背景水平。在76Ge中，在90% CL条件下，确定了中微子双β衰变半衰期的下限为2.7 1025 yr。这个分析将在这里进行总结，重点放在能量的确定上。马约拉纳演示器正在用两个模块阵列的天然锗和富集76Ge的锗探测器寻找76Ge中的中微子双β衰变。它位于美国南达科他州铅市桑福德地下研究设施4850英尺的高度，其锗探测器总质量为44.1千克，其中29.7千克为富集。对前26 kg- year数据的分析提供了前所未有的能量分辨率0.13%，在2039 keV的感兴趣区域和15.4±2.0计数/(FWHM t yr)的背景水平。在76Ge中，在90% CL条件下，确定了中微子双β衰变半衰期的下限为2.7 1025 yr。这个分析将在这里进行总结，重点放在能量的确定上。
{"title":"Recent results of the Majorana Demonstrator experiment","authors":"J. M. López-Castaño, S. Alvis, I. Arnquist, F. T. AvignoneIII, A. Barabash, C. Barton, V. Basu, F. Bertrand, B. Bos, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Yuen-Dat Chan, Cabot-Ann Christofferson, Ph Chu, M. Clark, C. Cuesta, J. Detwiler, A. Drobizhev, D. Edwins, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. P. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, R. Hegedus, R. Henning, D. H. Aguilar, E. Hoppe, A. Hostiuc, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, E. L. Martin, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, T. Oli, G. Othman, W. Pettus, A. Piliounis, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, N. Ruof, B. Shanks, M. Shirchenko, D. Tedeschi, R. L. Varner, S. Vasilyev, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, C. H. Yu, V. Yumatov, I. Zhitnikov, B. Zhu","doi":"10.1063/1.5130979","DOIUrl":"https://doi.org/10.1063/1.5130979","url":null,"abstract":"The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81971071","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}
. On-going measurements of the neutrinoless ββ decay are accompanied by the growing interest in computing the values of the associated nuclear matrix elements. In order to extract the neutrino mass from the potentially measured ββ half-lives one not only needs to know the values of the nuclear matrix elements but also the e ff ective value of the weak axial-vector coupling constant g A since its value a ff ects strongly the ββ half-lives. In order to gain knowledge of the possible quenching of g A in finite nuclei one can study, e.g., allowed Gamow-Teller β decays. A new promising tool to study the quenching are the measurements of ordinary muon capture transitions for which the range of momentum exchange, some 100 MeV, corresponds to the one of neutrinoless ββ decay.
{"title":"Neutrino-nuclear responses and the effective value of weak axial coupling","authors":"J. Suhonen","doi":"10.1063/1.5130987","DOIUrl":"https://doi.org/10.1063/1.5130987","url":null,"abstract":". On-going measurements of the neutrinoless ββ decay are accompanied by the growing interest in computing the values of the associated nuclear matrix elements. In order to extract the neutrino mass from the potentially measured ββ half-lives one not only needs to know the values of the nuclear matrix elements but also the e ff ective value of the weak axial-vector coupling constant g A since its value a ff ects strongly the ββ half-lives. In order to gain knowledge of the possible quenching of g A in finite nuclei one can study, e.g., allowed Gamow-Teller β decays. A new promising tool to study the quenching are the measurements of ordinary muon capture transitions for which the range of momentum exchange, some 100 MeV, corresponds to the one of neutrinoless ββ decay.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74023147","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}
{"title":"Investigation of 100Mo two-neutrino double beta decay in NEMO-3","authors":"","doi":"10.1063/1.5130989","DOIUrl":"https://doi.org/10.1063/1.5130989","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"170 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80665268","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}
In this contribution we report on quantification of theoretical uncertainties in nuclear matrix elements relevant for modeling dark matter and electro-weak interactions with nuclei. Recently we have developed a novel ab initio framework for computations of nuclear matrix elements and applied it in calculations of reaction rates for dark matter particles scattering off selected nuclear targets [1]. To evaluate the nuclear matrix elements we used nuclear wave functions computed within an ab initio many-body framework employing state-of-the-art nuclear Hamiltonians derived from chiral effective field theory. For the first time we have quantified the nuclear-physics uncertainties of the matrix elements that result from the remaining freedom in the construction of realistic nuclear interactions and their impact on physical observables. We found significant uncertainties especially for certain spin-dependent nuclear matrix elements. While our nuclear structure calculations have been performed with the no-core shell model method and applied in the context of dark matter searches, the approach can be generalized to other ab initio methods and extended to other sectors.
{"title":"Quantifying uncertainties in nuclear matrix elements for dark matter searches","authors":"D. Gazda, C. Forssén, R. Catena","doi":"10.1063/1.5130969","DOIUrl":"https://doi.org/10.1063/1.5130969","url":null,"abstract":"In this contribution we report on quantification of theoretical uncertainties in nuclear matrix elements relevant for modeling dark matter and electro-weak interactions with nuclei. Recently we have developed a novel ab initio framework for computations of nuclear matrix elements and applied it in calculations of reaction rates for dark matter particles scattering off selected nuclear targets [1]. To evaluate the nuclear matrix elements we used nuclear wave functions computed within an ab initio many-body framework employing state-of-the-art nuclear Hamiltonians derived from chiral effective field theory. For the first time we have quantified the nuclear-physics uncertainties of the matrix elements that result from the remaining freedom in the construction of realistic nuclear interactions and their impact on physical observables. We found significant uncertainties especially for certain spin-dependent nuclear matrix elements. While our nuclear structure calculations have been performed with the no-core shell model method and applied in the context of dark matter searches, the approach can be generalized to other ab initio methods and extended to other sectors.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82465450","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}
{"title":"Particle physics of non-standard 0νββ decay","authors":"L. Gráf","doi":"10.1063/1.5130970","DOIUrl":"https://doi.org/10.1063/1.5130970","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87990076","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}
{"title":"Investigation of Lorentz symmetry violation in double beta decay","authors":"S. Ghinescu, O. Niţescu, S. Stoica","doi":"10.1063/1.5130986","DOIUrl":"https://doi.org/10.1063/1.5130986","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76458458","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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