WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)最新文献

{"title":"FOREVER “FALLING APART”:","authors":"V. Schubert","doi":"10.2307/j.ctv1wd02ts.5","DOIUrl":"https://doi.org/10.2307/j.ctv1wd02ts.5","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82401450","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":"Contributors","authors":"","doi":"10.1215/9781478022039-171","DOIUrl":"https://doi.org/10.1215/9781478022039-171","url":null,"abstract":"","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85631565","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":"Experimental studies of axial-vector weak couplings for double beta decays by nuclear and muon CERs","authors":"H. Ejiri","doi":"10.1063/1.5130968","DOIUrl":"https://doi.org/10.1063/1.5130968","url":null,"abstract":"We report briefly recent experimental studies of axial-vector weak couplings for neutrino nuclear responses (squares of nuclear matrix elements NMEs) in the wide energy (0-50 MeV) and momentum (0-100 MeV/c) regions, which are relevant to neutrinoless double beta decays (DBDs) and supernova neutrinos. High energy-resolution studies of charge exchange reactions (CERs) of (3He,t) are used for studying the τ− side NMEs, while charge exchange muon reactions (ordinary muon capture reactions OMC) are for studying the τ+ side NMEs. The experimental NMEs derived from the single β/EC NMEs and the CER NMEs show that the (J± ≤4) spin isospin (axial vector) NMEs are uniformly reduced by the coefficient gAeff/gAfree≈0.5−0.6 with respect to A pnQRPA NMEs. Then the DBD NMEs M0ν may be reduced by the coefficient around 0.5, depending on the ratio of the axial-vector to vector NMEs, with respect to the pnQRPA NMEs.We report briefly recent experimental studies of axial-vector weak couplings for neutrino nuclear responses (squares of nuclear matrix elements NMEs) in the wide energy (0-50 MeV) and momentum (0-100 MeV/c) regions, which are relevant to neutrinoless double beta decays (DBDs) and supernova neutrinos. High energy-resolution studies of charge exchange reactions (CERs) of (3He,t) are used for studying the τ− side NMEs, while charge exchange muon reactions (ordinary muon capture reactions OMC) are for studying the τ+ side NMEs. The experimental NMEs derived from the single β/EC NMEs and the CER NMEs show that the (J± ≤4) spin isospin (axial vector) NMEs are uniformly reduced by the coefficient gAeff/gAfree≈0.5−0.6 with respect to A pnQRPA NMEs. Then the DBD NMEs M0ν may be reduced by the coefficient around 0.5, depending on the ratio of the axial-vector to vector NMEs, with respect to the pnQRPA NMEs.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76700838","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":"Double charge exchange reactions and neutrinoless double beta decay","authors":"E. Santopinto, J. Ferretti, R. Vsevolodovna, H. García-Tecocoatzi","doi":"10.1063/1.5130983","DOIUrl":"https://doi.org/10.1063/1.5130983","url":null,"abstract":"Using the eikonal approximation and small momentum transfer approximation a simple model for differential cross section for double charge exchange has been derived and under those hypothesis a factorization of the reaction part and the nuclear part holds. Moreover, the explicit form for a double charge exchange effective potential has been derived in the closure approximation and also and explicit expression for the nuclear matrix elements that are of the form of Double Gamow-Teller and Double Fermi in the microscopic IBM-2.Using the eikonal approximation and small momentum transfer approximation a simple model for differential cross section for double charge exchange has been derived and under those hypothesis a factorization of the reaction part and the nuclear part holds. Moreover, the explicit form for a double charge exchange effective potential has been derived in the closure approximation and also and explicit expression for the nuclear matrix elements that are of the form of Double Gamow-Teller and Double Fermi in the microscopic IBM-2.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"83 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90261722","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":"Neutrinoless double beta decay of atomic nuclei","authors":"M. Horoi","doi":"10.1063/1.5130973","DOIUrl":"https://doi.org/10.1063/1.5130973","url":null,"abstract":"Neutrinos are elusive particles interacting weekly with the atomic nuclei and electron plasma. Most of the atomic nuclei that are stable from the strong interaction point of view can decay emitting neutrinos or antineutrinos. The properties of weak interaction are essential for the understanding of the fundamental symmetries that constrain the Standard Model of particle physics. Neutrinoless double beta decay, if observed, would signal physics beyond the Standard Model (BSM). We analyze the neutrino physics relevant for the double beta decay of the atomic nuclei. Contributions to the decay rate from different terms in the BSM Lagrangian are presented, and their relevance for the analysis of the experimental data are addressed. We investigate if the neutrino mixing effects in the high electron density inside the atomic nuclei can change the neutrinoless double beta decay half-life formula and we found that the standard result stands.Neutrinos are elusive particles interacting weekly with the atomic nuclei and electron plasma. Most of the atomic nuclei that are stable from the strong interaction point of view can decay emitting neutrinos or antineutrinos. The properties of weak interaction are essential for the understanding of the fundamental symmetries that constrain the Standard Model of particle physics. Neutrinoless double beta decay, if observed, would signal physics beyond the Standard Model (BSM). We analyze the neutrino physics relevant for the double beta decay of the atomic nuclei. Contributions to the decay rate from different terms in the BSM Lagrangian are presented, and their relevance for the analysis of the experimental data are addressed. We investigate if the neutrino mixing effects in the high electron density inside the atomic nuclei can change the neutrinoless double beta decay half-life formula and we found that the standard result stands.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77516550","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":"Aurora experiment: Final results of studies of 116Cd 2β decay with enriched 116CdWO4 crystal scintillators","authors":"V. Tretyak, A. Barabash, P. Belli, R. Bernabei, F. Cappella, V. Caracciolo, R. Cerulli, D. Chernyak, F. Danevich, S. D'angelo, A. Incicchitti, D. Kasperovych, V. Kobychev, S. Konovalov, M. Laubenstein, D. Poda, O. Polischuk, V. Shlegel, V. Umatov, Y. Vasiliev","doi":"10.1063/1.5130990","DOIUrl":"https://doi.org/10.1063/1.5130990","url":null,"abstract":"Final results of studies of 116Cd 2β decay with CdWO4 crystal scintillators, enriched in 116Cd to 82%, are presented. After few years (2011 – 2017) of measurements with radiopure 116CdWO4 scintillators (mass of 1.162 kg) at the Gran Sasso underground laboratory (Italy), the half-life of 116Cd relatively to 2ν2β decay to the ground state of 116Sn was measured with the highest up-to-date accuracy as T1/2=(2.63−0.12+0.11)×1019 yr. A new limit on 0ν2β decay of 116Cd was set as T1/2≥2.2×1023 yr at 90% C.L., which is the most stringent to-date restriction for this isotope. Limits for 0ν2β decay with majoron(s) emission, Lorentz-violating 2ν2β decay and 2β transitions to excited states of 116Sn were set at the level of T1/2≥1020−1022 yr.Final results of studies of 116Cd 2β decay with CdWO4 crystal scintillators, enriched in 116Cd to 82%, are presented. After few years (2011 – 2017) of measurements with radiopure 116CdWO4 scintillators (mass of 1.162 kg) at the Gran Sasso underground laboratory (Italy), the half-life of 116Cd relatively to 2ν2β decay to the ground state of 116Sn was measured with the highest up-to-date accuracy as T1/2=(2.63−0.12+0.11)×1019 yr. A new limit on 0ν2β decay of 116Cd was set as T1/2≥2.2×1023 yr at 90% C.L., which is the most stringent to-date restriction for this isotope. Limits for 0ν2β decay with majoron(s) emission, Lorentz-violating 2ν2β decay and 2β transitions to excited states of 116Sn were set at the level of T1/2≥1020−1022 yr.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87748331","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":"Precise measurement of 2ν2β decay of 100Mo with Li2MoO4 low temperature detectors: Preliminary results","authors":"E. Armengaud, C. Augier, A. Barabash, F. Bellini, A. Benő, M. Beretta, L. Bergé, N. Besson, J. Billard, Yu. A. Borovlev, C. Bourgeois, V. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. D. Combarieu, F. Danevich, I. Dafinei, M. Jésus, L. Dumoulin, K. Eitel, F. Ferri, B. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. Grigorieva, M. Gros, E. Guerard, H. Huang, R.Huang Lbnl, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. Kobychev, Y. Kolomensky, S. Konovalov, A. Leder, J. Kotila, P. Loaiza, R. Maisonobe, E. Makarov, P. Marcillac, S. Marnieros, X. Navick, C. Nones, V. Novati, E. Olivieri, L. Pagnanini, P. Pari, L. Pattavina, M. Pavan, B. Paul, H. Peng, G. Pessina, S. Pirrò, D. Poda, O. Polischuk, E. Previtali, E. Queguiner, T. Redon, S. Rozov, C. Rusconi, V. Sanglard, K. Schäffner, Y. Shen, B. Schmidt, V. Shlegel, B. Siebenborn, S. Sorbino, C. Tomei, V. Tretyak, V. Umatov, L. Vagneron, M. Velázquez, M. Vignati, M. Weber, L. Winslow, M. Xue, E. Yakushev, A. Zolotaro","doi":"10.1063/1.5130966","DOIUrl":"https://doi.org/10.1063/1.5130966","url":null,"abstract":"The half-life of 100Mo relatively to the 2ν2β decay to the ground state of 100Ru was measured as T1/2 = (6.99±0.15) × 1018 yr with the help of enriched in 100Mo lithium molybdate scintillating bolometers in the EDELWEISS-III low background set-up at the Modane underground laboratory. This is the most accurate value of the 2ν2β half-life of 100Mo.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88226681","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":"Various aspects and results on beta decay, DBD, COBRA and LFV","authors":"K. Zuber","doi":"10.1063/1.5130991","DOIUrl":"https://doi.org/10.1063/1.5130991","url":null,"abstract":"Various kinds of rare events can be studied but only a small fraction of these are mentioned in these proceedings. The search for rare events is quite some fun but also very hard work as typically very high backgrounds must be tackled for a very small signal. The first process discussed is double beta decay, which is an extremely rare process and requires half-live measurements around 1020 years for the neutrino accompanied mode, while for the neutrino-less mode much longer half-lives are already explored. Nuclear physics input is needed for the matrix elements and a quenching measurement of gA will be presented. In this case the focus is on the highly forbidden Cd-113 beta decay. New half-lives for the forbidden EC/beta decay measurement of V-50 will be presented. In addition new precision half-lives of long-living alpha decays will be presented as well.Various kinds of rare events can be studied but only a small fraction of these are mentioned in these proceedings. The search for rare events is quite some fun but also very hard work as typically very high backgrounds must be tackled for a very small signal. The first process discussed is double beta decay, which is an extremely rare process and requires half-live measurements around 1020 years for the neutrino accompanied mode, while for the neutrino-less mode much longer half-lives are already explored. Nuclear physics input is needed for the matrix elements and a quenching measurement of gA will be presented. In this case the focus is on the highly forbidden Cd-113 beta decay. New half-lives for the forbidden EC/beta decay measurement of V-50 will be presented. In addition new precision half-lives of long-living alpha decays will be presented as well.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84692555","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":"Results on double beta decay of 82Se with CUPID-0 Phase I","authors":"L. Pagnanini, O. Azzolini, J. Beeman, F. Bellini, M. Beretta, M. Biassoni, C. Brofferio, C. Bucci, S. Capelli, L. Cardani, P. Carniti, N. Casali, D. Chiesa, M. Clemenza, O. Cremonesi, A. Cruciani, I. Dafinei, S. Domizio, F. Ferroni, L. Gironi, A. Giuliani, P. Gorla, C. Gotti, G. Keppel, S. Nagorny, M. Nastasi, S. Nisi, C. Nones, D. Orlandi, M. Pallavicini, L. Pattavina, M. Pavan, G. Pessina, V. Pettinacci, S. Pirrò, S. Pozzi, E. Previtali, A. Puiu, C. Rusconi, K. Schäffner, C. Tomei, M. Vignati, A. Zolotarova","doi":"10.1063/1.5130980","DOIUrl":"https://doi.org/10.1063/1.5130980","url":null,"abstract":"CUPID-0 is the first neutrinoless double beta decay (0νββ) experiment based on highly enriched scintillating bolometers. It consists in an array of Zn82Se detectors operated at LNGS since 2017. During the Phase I of data taking, concluded at the end of 2018, the experiment collected an exposure of 9.95 kg·yr of ZnSe. The simultaneous heat-light readout provides a powerful rejection of α-particles and allows us to suppress the background in the region of interest down to 3.5−0.9+1.0×10−3 counts/(keV·kg·y), an unprecedented level for this technique. Thanks to this achievement, we set the most stringent lower limit on the 82Se 0νββ half-life. Moreover, we have developed a full background model, which allows us to identify the origin of the events in the region of interest. The reconstruction of the CUPID-0 spectrum has enabled us to perform the most precise measurement of the 2νββ of 82Se.CUPID-0 is the first neutrinoless double beta decay (0νββ) experiment based on highly enriched scintillating bolometers. It consists in an array of Zn82Se detectors operated at LNGS since 2017. During the Phase I of data taking, concluded at the end of 2018, the experiment collected an exposure of 9.95 kg·yr of ZnSe. The simultaneous heat-light readout provides a powerful rejection of α-particles and allows us to suppress the background in the region of interest down to 3.5−0.9+1.0×10−3 counts/(keV·kg·y), an unprecedented level for this technique. Thanks to this achievement, we set the most stringent lower limit on the 82Se 0νββ half-life. Moreover, we have developed a full background model, which allows us to identify the origin of the events in the region of interest. The reconstruction of the CUPID-0 spectrum has enabled us to perform the most precise measurement of the 2νββ of 82Se.","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79867048","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":"High-lying Gamow-Teller resonances and neutrino capture cross-section for 76Ge","authors":"A. Fazliakhmetov, L. Inzhechik, G. Koroteev, Y. Lutostansky, V. N. Tikhonov, A. K. Vyborov","doi":"10.1063/1.5130976","DOIUrl":"https://doi.org/10.1063/1.5130976","url":null,"abstract":"The effect of the GT-resonance structure of charge-exchange strength function in the 76Ge(3He,t)76 As reaction on the solar neutrino capture cross section was examined. It is shown that accounting of GT-resonances increase solar neutrino capture rate more then 20%. Theoretical strength functions for 76Ge and 74Ge were calculated in accordance with the framework of the self-consistent theory of finite Fermi systems. This results could help to decompose experimental strength function and itemize some low-lying excitation states and pygmy resonances. Also we demonstrate significant role of quenching effect for cross section calculations. Accurate counting of neutrino capture rate could change estimations on background events index in experiments on double beta decay search (like LEGEND).The effect of the GT-resonance structure of charge-exchange strength function in the 76Ge(3He,t)76 As reaction on the solar neutrino capture cross section was examined. It is shown that accounting of GT-resonances increase solar neutrino capture rate more then 20%. Theoretical strength functions for 76Ge and 74Ge were calculated in accordance with the framework of the self-consistent theory of finite Fermi systems. This results could help to decompose experimental strength function and itemize some low-lying excitation states and pygmy resonances. Also we demonstrate significant role of quenching effect for cross section calculations. Accurate counting of neutrino capture rate could change estimations on background events index in experiments on double beta decay search (like LEGEND).","PeriodicalId":23715,"journal":{"name":"WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX’19)","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73924006","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}