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Phys. Rev. C 80, 054306 (2009) [11 pages]

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

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Yang Sun1,2,3, Ying-Chun Yang1, Hong-Liang Liu1, Kazunari Kaneko4, Munetake Hasegawa1,2, and Takahiro Mizusaki5
1Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
4Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan
5Institute of Natural Sciences, Senshu University, Tokyo 101-8425, Japan

Received 1 September 2009; published 12 November 2009

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 g9/2. 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≈40 isotopes and emphasizes the important role of the neutron g9/2 orbital in determining the structure properties for both low- and high-spin states in these nuclei.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.80.054306
DOI:
10.1103/PhysRevC.80.054306
PACS:
21.10.Re, 21.60.Cs, 27.40.+z, 27.50.+e
 
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