Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-10-11
Phys.Lett.B696:197-200,2011
Physics
Nuclear Physics
Nuclear Theory
10 pages, 2 figures, accepted by Phys. Lett. B
Scientific paper
10.1016/j.physletb.2010.10.065
To discuss whether an enhanced isomer decay is a preferred process in a plasma environment it is required to know the structure of the isomer as well as the nearby states. The spin-21/2, 6.85-hour high-spin isomer in 93Mo is investigated within a shell model which well describes nuclei in this mass region. By using the obtained wave-functions which correctly reproduce the observed B(E2), B(E4), and B(M1) transitions, characteristics of the isomer are shown in comparison with the isomeric states in neighboring nuclei. Calculations suggest that these high-spin isomers are formed with almost pure single-particle-like configurations. The 93Mo 21/2^+ isomer has the predominant configuration $\pi (g_{9/2})^2_{8} \otimes \nu d_{5/2}$ lying below the 15/2^+, 17/2^+, and 19/2^+ states due to neutron-proton interaction, which is the physical origin of its long lifetime. The key E2 transition that connects the 21/2^+ isomer to the upper 17/2^+ level is predicted to be substantial (3.5 W.u), and therefore there is a real prospect for observing induced isomer deexcitation.
Hasegawa Manabu
Kaneko Kazuhisa
Mizusaki Takahiro
Sun Yadong
Tazaki S.
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