Ground-state -decay spectroscopy of Ta

向井 もも*; 平山 賀一*; 渡辺 裕*; 渡邉 寛*; 小浦 寛之; Jeong, S. C.*; 宮武 宇也*; Brunet, M.*; 石澤 倫*; Kondev, F. G.*; et al.

Physical Review C, 105(3), p.034331_1 - 034331_6, 2022/03

https://doi.org/10.1103/PhysRevC.105.034331

Beta-decay spectroscopy of the Ta ground state was performed at the KEK Isotope Separation System. -delayed rays corresponding to the previously reported in-beam transitions were observed. The -decay half-life of the Ta ground state was determined to be 283(10) s by analyzing a time spectrum of - coincidence events. The -decay branching ratio and log() values were evaluated for the first time. Based on the newly evaluated log() values of 6.0 and a decay scheme, spin-parity values of I = 7/2 originating from the odd-proton orbit 7/2[404] were assigned with high confidence, which is consistent with the systematics of neighboring odd-A nuclides.