Three-body forces and shell structure in calcium isotopes
Nuclear Theory
2012-07-12 v3 Solar and Stellar Astrophysics
High Energy Physics - Phenomenology
Nuclear Experiment
Abstract
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 Letter, we show that three-nucleon forces give rise to repulsive interactions between two valence neutrons that are key to explain 48Ca 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.
Keywords
Cite
@article{arxiv.1009.5984,
title = {Three-body forces and shell structure in calcium isotopes},
author = {Jason D. Holt and Takaharu Otsuka and Achim Schwenk and Toshio Suzuki},
journal= {arXiv preprint arXiv:1009.5984},
year = {2012}
}
Comments
5 pages, 4 figures; improved version and added coupled-cluster benchmark; published version