Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-05-09
Phys.Rev.C77:064304,2008; Erratum-ibid..C78:049903,2008
Physics
Nuclear Physics
Nuclear Theory
10 pages, 14 figures, accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.77.064304
Using a shell model which is capable of describing the spectra of upper $g_{9/2}$-shell nuclei close to the $N=Z$ line, we study the structure of two isomeric states $7^{+}$ and $21^{+}$ in the odd-odd $N=Z$ nucleus $^{94}$Ag. It is found that both isomeric states exhibit a large collectivity. The $7^{+}$ state is oblately deformed, and is suggested to be a shape isomer in nature. The $21^{+}$ state becomes isomeric because of level inversion of the $19^{+}$ and $21^{+}$ states due to core excitations across the $N=Z=50$ shell gap. Calculation of spectroscopic quadrupole moment indicates clearly an enhancement in these states due to the core excitations. However, the present shell model calculation that produces the $19^{+}$-$21^{+}$ level inversion cannot accept the large-deformation picture of Mukha {\it et al.} in Nature {\bf 439}, 298 (2006).
Hasegawa Manabu
Kaneko Kazuhisa
Mizusaki Takahiro
Sun Yadong
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