Ground-state properties of neutron-rich Mg isotopes

S. Watanabe, K. Minomo, M. Shimada, S. Tagami, M. Kimura, M. Takechi, M. Fukuda, D. Nishimura, T. Suzuki, T. Matsumoto, Y. R. Shimizu, M. Yahiro

研究成果: Contribution to journalArticle査読

49 被引用数 (Scopus)

抄録

We analyze recently measured total reaction cross sections for 24-38Mg isotopes incident on 12C targets at 240 MeV/nucleon by using the folding model and antisymmetrized molecular dynamics (AMD). The folding model well reproduces the measured reaction cross sections, when the projectile densities are evaluated by the deformed Woods-Saxon (def-WS) model with AMD deformation. Matter radii of 24-38Mg are then deduced from the measured reaction cross sections by fine tuning the parameters of the def-WS model. The deduced matter radii are largely enhanced by nuclear deformation. Fully microscopic AMD calculations with no free parameter well reproduce the deduced matter radii for 24-36Mg, but still considerably underestimate them for 37,38Mg. The large matter radii suggest that 37,38Mg are candidates for deformed halo nucleus. AMD also reproduces other existing measured ground-state properties (spin parity, total binding energy, and one-neutron separation energy) of Mg isotopes. Neutron-number (N) dependence of deformation parameter is predicted by AMD. Large deformation is seen from 31Mg with N=19 to a drip-line nucleus 40Mg with N=28, indicating that both the N=20 and 28 magicities disappear. N dependence of neutron skin thickness is also predicted by AMD.

本文言語英語
論文番号044610
ジャーナルPhysical Review C - Nuclear Physics
89
4
DOI
出版ステータス出版済み - 4 23 2014

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学

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