Three-body forces and shell structure in calcium isotopes
Jason D HoltDepartment of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USATakaharu OtsukaDepartment of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, JapanAchim SchwenkExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, GermanyToshio SuzukiDepartment of Physics, Nihon University, Sakurajosui 3, Tokyo 156-8550, Japan
2012en
ABI
Annotatsiya
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 48 Ca 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.
Hali tarjima qilinmagan
Identifikatorlar
Iqtiboslar va manbalar
2 ta iqtibos0 ta foydalanilgan manba