Abstract
The quantum-number projected generator coordinate method (GCM) is ap- plied to the neutron-rich Se and Ge isotopes, where the monopole and quadrupole pairing plus quadrupole-quadrupole interaction is employed as an effective interaction. The en- ergy spectra obtained by the GCM are compared to both the shell model results and the experimental data. The GCM reproduces well the energy levels of high-spin states as well as the low-lying states. The structure of the low-lying collective states is analyzed through the GCM wave functions.
Highlights
The intriguing properties of the even-even Se and Ge isotopes in the mass region A ∼ 80 have been investigated in a number of previous experimental and theoretical studies [1,2,3]
In order to investigate the features of these states, the energy spectra in the shell model were compared with those in a pair-truncated shell model (PTSM)
Through the analysis of the PTSM wave functions, it was found that the angular momenta zero and two collective pairs are dominant in low-lying states, while the effect of the alignment of two 0g9/2 neutrons becomes apparent above 8+1 states
Summary
The intriguing properties of the even-even Se and Ge isotopes in the mass region A ∼ 80 have been investigated in a number of previous experimental and theoretical studies [1,2,3]. These isotopes belong to a typical transitional region that lies between spherical and deformed regions. The calculations reproduced well the experimental energy levels and electromagnetic transition rates for both the low-lying and high-spin states.
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