Measurement of the double- β decay of ^150 Nd to the 0 ^+_1 excited state of ^150 Sm in NEMO-3
X. Aguerre,R. Arnold,C. Augier,A. S. Barabash,A. Basharina-Freshville,S. Blondel,S. Blot,M. Bongrand,R. Breier,V. Brudanin,J. Busto,A. Bystryakov,A. J. Caffrey,C. Cerna,J. P. Cesar,M. Ceschia,E. Chauveau,A. Chopra,L. Dawson,D. Duchesneau,D. Durand,J. J. Evans,R. Flack,P. Franchini,X. Garrido,C. Girard-Carillo,B. Guillon,P. Guzowski,M. Hoballah,R. Hodák,P. Hubert,M. H. Hussain,S. Jullian,A. Klimenko,O. Kochetov,S. I. Konovalov,F. Koňařík,T. Křižák,D. Lalanne,K. Lang,Y. Lemière,P. Li,P. Loaiza,G. Lutter,M. Macko,F. Mamedov,C. Marquet,F. Mauger,A. Minotti,B. Morgan,I. Nemchenok,M. Nomachi,F. Nowacki,H. Ohsumi,G. Oliviéro,V. Palušová,C. Patrick,F. Perrot,M. Petro,A. Pin,F. Piquemal,P. Povinec,S. Pratt,P. Přidal,W. S. Quinn,Y. A. Ramachers,A. Remoto,J. L. Reyss,C. L. Riddle,E. Rukhadze,R. Saakyan,A. Salamatin,R. Salazar,X. Sarazin,J. Sedgbeer,Yu. Shitov,L. Simard,F. Šimkovic,A. Smetana,A. Smolnikov,S. Söldner-Rembold,I. Štekl,J. Suhonen,G. Szklarz,H. Tedjditi,J. Thomas,V. Timkin,V. I. Tretyak,V. I. Tretyak,V. I. Umatov,I. Vanushin,Y. Vereshchaka,V. Vorobel,D. Waters,F. Xie
The European Physical Journal C（2023）
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摘要
The NEMO-3 results for the double- β decay of ^150 Nd to the 0 ^+_1 and 2 ^+_1 excited states of ^150 Sm are reported. The data recorded during 5.25 year with 36.6 g of the isotope ^150 Nd are used in the analysis. The signal of the 2νββ transition to the 0 ^+_1 excited state is detected with a statistical significance exceeding 5 σ . The half-life is measured to be T_1/2^2νββ(0^+_1) = [ 1.11 ^+0.19_-0.14 ( stat) ^+0.17_-0.15 ( syst) ] × 10^20 year, which is the most precise value that has been measured to date. 90
