Magicity of the 68Ni semidouble-closed-shell nucleus probed by Gamow-Teller decay of the odd-A neighbors

被引:73
作者
Mueller, WF [1 ]
Bruyneel, B
Franchoo, S
Grawe, H
Huyse, M
Köster, U
Kratz, KL
Kruglov, K
Kudryavtsev, Y
Pfeiffer, B
Raabe, R
Reusen, I
Thirolf, P
Van Duppen, P
Van Roosbroeck, J
Vermeeren, L
Walters, WB
Weissman, L
机构
[1] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium
[2] Gesell Schwerionenforsch mbH, D-64291 Darmstadt, Germany
[3] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
[4] Johannes Gutenberg Univ Mainz, Inst Kernchem, D-55099 Mainz, Germany
[5] Univ Munich, Sekt Phys, D-85748 Garching, Germany
[6] Univ Maryland, Dept Chem, College Pk, MD 20742 USA
关键词
D O I
10.1103/PhysRevLett.83.3613
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The particle-hole excitations through the N = 40 subshell around Ni-68 have been studied by the beta decay of Co-69 and Ni-69. The half-life of Co-69 was measured to be 0.22(2) s, and a new beta-decaying isomer with a half-life of 3.5(5) s was identified in Ni-69. From the decay of the Ni-69 isomer a 9(4)% mixing of the pi p(3/2)(+1)nu p(1/2)(-2)nu g(9/2)(+2) configuration into the ground state of Cu-69 can be deduced. Significant polarization of the Ni-68 core nucleus is observed with the coupling of a single nucleon, which implies a rapid decrease in the stabilizing effect of the N = 40 semimagic shell gap.
引用
收藏
页码:3613 / 3616
页数:4
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