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論文

Ground-state $$beta$$-decay spectroscopy of $$^{187}$$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

 被引用回数:7 パーセンタイル:72.81(Physics, Nuclear)

Beta-decay spectroscopy of the $$^{187}$$Ta ground state was performed at the KEK Isotope Separation System. $$beta$$-delayed $$gamma$$ rays corresponding to the previously reported in-beam transitions were observed. The $$beta$$-decay half-life of the $$^{187}$$Ta ground state was determined to be 283(10) s by analyzing a time spectrum of $$beta$$-$$gamma$$ coincidence events. The $$beta$$-decay branching ratio and log($$ft$$) values were evaluated for the first time. Based on the newly evaluated log($$ft$$) values of $$>$$6.0 and a decay scheme, spin-parity values of I$$^pi$$ = 7/2$$^+$$ originating from the odd-proton orbit $$pi$$7/2[404] were assigned with high confidence, which is consistent with the systematics of neighboring odd-A nuclides.

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