Three-body forces and shell structure in calcium isotopes
Jason D HoltDepartment of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USATakaharu OtsukaNational Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USAAchim SchwenkInstitut für Kernphysik, Technische Universität Darmstadt, 64289 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.
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