Abstract By using a microscopic sdIBM-2+2q.p. approach, the levels of the ground-band, $\gamma$-band and partial two-quasi-particle bands for $^{72-84}$Kr isotopes are calculated. The data obtained are in good agreement with the recent experimental results, and successfully reproduce the nuclear shape phase transition of $^{72-84}$Kr isotopes at zero temperature. The ground-state band is described successfully up to $J^{\pi}=18^+$ and $E_x=10.0$MeV. Based on this model, the aligned requisite minimum energy has been deduced. The theoretical calculations indicate that no distinct change of nuclear states is caused by the abruptly broken pair of a boson, and predict that the first backbending of Kr isotopes may be the result of aligning of two quasi-neutrons in orbit g$_{9/2}$, which gains the new experimental support of the measurements of g factors in the ${}^{78-86}$Kr isotopes.
Received: 13 November 2002
Revised: 03 April 2003
Accepted manuscript online:
Fund: Project supported by the Science Foundation of the Science－Technology Department of Guizhou Province China (Grant No Qian Ji He Ji Zi [2002]3025).
Cite this article:
Shi Zhu-Yi (石筑一), Zhao Xing-Zhi (赵行知), Tong Hong (童红) Spectral property and its shape transition on 72-84Kr isotopes in microscopic core plus two-quasiparticle approach 2003 Chinese Physics 12 732
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