Shell model study for neutron-rich sd-shell nuclei

Abstract

The microscopic structure of neutron-rich sd-shell nuclei is investigated by using the spherical shell-model in the sd-pf valence space with the extended pairing plus quadrupole-quadrupole forces accompanied by the monopole interaction (EPQQM). The calculation reproduces systematically the known energy levels for even-even and odd-mass nuclei including the recent data for 43S, 46S and 47Ar. In particular, the erosion of the N=28 shell closure in 42Si can be explained. Our EPQQM results are compared with other shell-model calculations with the SDPF-NR and SDPF-U effective interactions.

7 pages, 10 figures, accepted for publication in Phys. Rev. C

References in corpus (9)

• Novel features of nuclear forces and shell evolution in exotic nuclei
• Collapse of the N=28 shell closure in ${}^{42}$Si
• A new effective interaction for $0\hslash \omega$ shell model calculations in the sdpf valence space
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• Shell evolution and nuclear forces
• Shell model study of single-particle and collective structure in neutron-rich Cr isotopes
• In-beam gamma-ray spectroscopy of very neutron-rich nuclei: Excited states in 46S and 48Ar
• Shell structure underlying the evolution of quadrupole collectivity in S-38 and S-40 probed by transient-field g-factor measurements on fast radioactive beams
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• Quadrupole collectivity beyond N=28: Intermediate-energy Coulomb excitation of 47,48Ar
• Towards a unified realistic shell-model Hamiltonian with the monopole-based universal force
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• Nuclear structure properties of Si and P isotopes with the microscopic effective interactions
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• Study of S, Cl and Ar isotopes with $N\ge Z$ using microscopic effective $sd$-shell interactions
• ${}^{35,37,39}$S isotopes in $sd-pf$ space : Shell-model interpretation