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Evidence for a $$K^pi=1/2^+$$ isomer in neutron-rich $$^{185}$$Ta

Shizuma, Toshiyuki; Ishii, Tetsuro  ; Makii, Hiroyuki   ; Hayakawa, Takehito; Shigematsu, Soichiro*; Matsuda, Makoto  ; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*

Excited states in neutron-rich $$^{185}$$Ta have been populated following the one-proton pickup reaction of $$^{186}$$W($$^{18}$$O,$$^{19}$$F). In-beam $$gamma$$ rays were measured in coincidence with scattered particles detected by a high-resolution $$Delta E$$-$$E$$ Si telescope for reaction channel selection. Several low-lying levels including a $$T_{1/2}=0.9(3)$$ $$mu$$s isomer at 406 keV have been identified. A spin assignment of $$I=3/2$$ and the 1/2$$^+$$[411] Nilsson configuration are given to the isomer in comparison with the level energy systematics and the isomer decay rates in the region.

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Category:Physics, Nuclear

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