中国物理B ›› 2003, Vol. 12 ›› Issue (7): 732-737.doi: 10.1088/1009-1963/12/7/306

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Spectral property and its shape transition on 72-84Kr isotopes in microscopic core plus two-quasiparticle approach

石筑一, 赵行知, 童红   

  1. Department of Physics, Guizhou Institute for Nationalities, Guiyang 550025, China
  • 收稿日期:2002-11-13 修回日期:2003-04-03 出版日期:2003-07-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the Science Foundation of the Science－Technology Department of Guizhou Province China (Grant No Qian Ji He Ji Zi [2002]3025).

Spectral property and its shape transition on 72-84Kr isotopes in microscopic core plus two-quasiparticle approach

Shi Zhu-Yi (石筑一), Zhao Xing-Zhi (赵行知), Tong Hong (童红)   

  1. Department of Physics, Guizhou Institute for Nationalities, Guiyang 550025, China
  • Received:2002-11-13 Revised:2003-04-03 Online:2003-07-16 Published:2005-03-16
  • Supported by:
    Project supported by the Science Foundation of the Science－Technology Department of Guizhou Province China (Grant No Qian Ji He Ji Zi [2002]3025).

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摘要： By using a microscopic sdIBM-2+2q.p. approach, the levels of the ground-band, γ-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^π=18^+ and E_x=10.0MeV. 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.

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.

Key words: microscopic sdIBM-2+2q.p. approach, high-spin states, shape phase transition, ${}^{72-84}$Kr isotopes

中图分类号:  (Models based on group theory)

  • 21.60.Fw
23.20.Lv (γ-transitions and level energies) 27.50.+e (59 ≤ A ≤ 89) 21.10.Hw (Spin, parity, and isobaric spin)