Pairing effects on the collectivity of quadrupole states around 32Mg

Details Pairing effects on the collectivity of quadrupole states around 32Mg Pairing effects on the collectivity of quadrupole states around 32Mg

2003-07-11

arxiv.org/abs/nucl-th/0307051v1

Phys.Rev. C69 (2004) 034301

Physics

Nuclear Physics

Nuclear Theory

14 pages, 9 figures

Scientific paper

10.1103/PhysRevC.69.034301

The first 2+ states in N=20 isotones including neutron-rich nuclei 32Mg and 30Ne are studied by the Hartree-Fock-Bogoliubov plus quasiparticle random phase approximation method based on the Green's function approach. The residual interaction between the quasiparticles is consistently derived from the hamiltonian density of Skyrme interactions with explicit velocity dependence. The B(E2) transition probabilities and the excitation energies of the first 2+ states are well described within a single framework. We conclude that pairing effects account largely for the anomalously large B(E2) value and the very low excitation energy in 32Mg.

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