Prog. Theor. Phys. Supplement No.146 (2002) pp. 483-487
Breaking of the Magic Number N=20 Studied with the New Version of AMD
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
(Received January 28, 2002)
The neutron-rich nuclei 32Mg and 30Ne are studied
using a new version of antisymmetrized molecular dynamics (AMD). After
the angular-momentum projection, 32Mg and 30Ne
have largely deformed ground states, and the experimental data for
32Mg are reproduced with reasonable accuracy. The ground
states of these nuclei have neutron 2p2h structure. We also have
studied the negative-parity states of these nuclei. Their lowest
negative-parity states which have spin-parity 1- have quite small
excitation energies compared to stable N=20 isotones. By using the
Gogny force, their excitation energies have calculated to be 2.4 MeV for
30Ne and 2.3 MeV for 32Mg and these 1- states
have neutron 3p3h structure.
DOI : 10.1143/PTPS.146.483
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