Systematics of high-spin isomers in N=83 isotones and a high-spin isomer beam

作者：Gono Y^*; Odahara A; Fukuchi T; Ideguchi E; Kishida T; Kubo T; Watanabe H; Motomura S; Saito K; Kashiyama O; Morikawa T; Cederwall B; Zhang YH; Zhou XH; Ishihara M; Sagawa H

来源：European Physical Journal A, 2002, 13(1-2): 5-8.

Isomers in N = 83 isotones of Z = 60 66 were studied systematically. Their spins and parities arc,49/2(+) and 27(+) for odd and odd-odd nuclei, respectively. Nearly constant excitation energies of these isomers indicated a decrease of a Z = 64 shell gap energy as Z decreases from 64 to 60 within the framework of a deformed independent-particle model (DIPM). Their configurations are [v(f(tau/2)h(9/2)i(13/2)), pi(h(11/2))(2)](49/2+) and [v(f(7/2)h(9/2)i(13/2)), pi(h(11/2))(2)(d(5/2))(-1)](27+) for odd and odd-odd nuclei, respectively. The shape of the yrast status changes suddenly at spin 49/2(odd) and 27(odd-odd) from a near spherical to an oblate shape. Transitions from isomers are highly hindered because of the shape changes. They may be categorized to be shape isomers. The development of a secondary beam produced by using these high-spin isomers is also described.

• 出版日期2002-2
• 单位中国科学院近代物理研究所