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Structure of upper-g9/2-shell nuclei and shape effect in the 94Ag isomeric states

Abstract : Using a shell model which is capable of describing the spectra of upper g9/2-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 94Ag. 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 et al. [Nature (London) 439, 298 (2006)].
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Submitted on : Friday, October 2, 2009 - 3:15:32 PM
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K. Kaneko, Y. Sun, M. Hasegawa, T. Mizusaki. Structure of upper-g9/2-shell nuclei and shape effect in the 94Ag isomeric states. Physical Review C, American Physical Society, 2008, 77, pp.064304. ⟨10.1103/PhysRevC.77.064304⟩. ⟨in2p3-00421674⟩

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