NEMO-3 中 $^{150}$Nd 的双-$\eta$衰变到 $^{150}$Sm 的0$^+_1$激发态的测量
摘要：$^{150}$Nd的双-$\eta$衰变到$^{150}$Sm的0$^+_1$和2$^+_1$激发态的NEMO-3结果报道。分析中使用了36.6克$^{150}$Nd同位素在5.25年内记录的数据。首次检测到了2$\nu\eta\eta$向0$^+_1$激发态的过渡的信号，统计显著性超过5$\sigma$。半衰期测量值为$T_{1/2}^{2\nu\eta\eta}(0^+_1) = \left[ 1.11^{+0.19}_{-0.14} ,\left(\text{stat}\right)^{+0.17}_{-0.15},\left(\text{syst}\right)\right] \times10^{20}\text{ yr}$。限制了2$\nu\eta\eta$衰变到2$^+_1$能级和0$\nu\eta\eta$衰变到$^{150}$Sm的0$^+_1$和2$^+_1$能级的情况。
作者：NEMO-3 Collaboration: 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. Hod''ak, P. Hubert, M.H. Hussain, S. Jullian, A. Klimentko, O. Kochetov, S.I. Konovalov, F. Kov{n}av{r}''ik, T. Kv{r}iv{z}''ak, D. Lalanne, K. Lang, Y. Lemi`ere, 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. Olivi''ero, V. Paluv{s}ov''a, C. Patrick, F. Perrot, M. Petro, A. Pin, F. Piquemal, P. Povinec, S.Pratt, P. Pv{r}idal, 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. v{S}imkovic, A. Smetana, A. Smolnikov, S. S"oldner-Rembold, I. v{S}tekl, 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 and F. Xie
论文ID：2203.03356
分类：Nuclear Experiment
分类简称：nucl-ex
提交时间：2023-08-30