Three-body forces and shell structure in calcium isotopes

被引：151

作者：

Holt, Jason D. ^{[1
,2
]}

Otsuka, Takaharu ^{[3
,4
,5
]}

Schwenk, Achim ^{[6
,7
]}

Suzuki, Toshio ^{[8
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

[3] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[4] Univ Tokyo, Ctr Nucl Study, Tokyo 1130033, Japan

[5] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[6] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[7] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[8] Nihon Univ, Dept Phys, Tokyo 1568550, Japan

来源：

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2012年 / 39卷 / 08期

关键词：

MODEL;

D O I：

10.1088/0954-3899/39/8/085111

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Understanding and predicting the formation of shell structure from nuclear forces is a central challenge for nuclear physics. While the magic numbers N = 2, 8, 20 are generally well understood, N = 28 is the first standard magic number that is not reproduced in microscopic theories with two-nucleon forces. In this paper, we show that three-nucleon forces give rise to repulsive interactions between two valence neutrons that are key to explain Ca-48 as a magic nucleus, with a high 2(+) excitation energy and a concentrated magnetic dipole transition strength. The repulsive three-nucleon mechanism improves the agreement with experimental binding energies.

引用

页数：7

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