Projected shell model description for high-spin states in neutron-rich Fe isotopes

Projected shell model description for high-spin states in neutron-rich Fe isotopes
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富中子铁同位素高自旋态的投影壳模型描述

DOI:
10.1103/physrevc.80.054306
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发表时间:
2009-11
期刊:
影响因子:
3.1
通讯作者:
Sun, Yang
Sun, Yang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kaneko, Kazunari;Mizusaki, Takahiro;Hasegawa, Munetake;Yang, Ying-Chun;Liu, Hong-Liang;Sun, Yang

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利用投影壳模型对中子数为32 ~ 42的丰中子偶偶Fe同位素进行了系统的研究。计算进行到自旋I=20状态。在yrast谱和B(E2)值中发现的不稳定性,讨论了高j轨道g{sub 9/2}的中子激发。此外,低K负宇称带的中子双准粒子结构和高K正宇称带的质子双准粒子结构被预测存在于yraast区附近。我们的研究揭示了N{approx_equal}40同位素基态的软性质,并强调了中子g{sub 9/2}轨道在确定这些核的低自旋和高自旋态的结构性质中的重要作用。
A systematic study of neutron-rich even-even Fe isotopes with a neutron number from 32 to 42 is carried out by using the projected shell model. Calculations are performed up to the spin I=20 state. Irregularities found in the yrast spectra and in B (E2) values are discussed in terms of neutron excitations to the high-j orbital g{sub 9/2}. Furthermore, the neutron two-quasiparticle structure of a low-K negative-parity band and the proton two-quasiparticle structure of a high-K positive-parity band are predicted to exist near the yrast region. Our study reveals a soft nature for the ground state of N{approx_equal}40 isotopes and emphasizes the important role of the neutron g{sub 9/2} orbital in determining the structure properties for both low- and high-spin states in these nuclei.
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