Three-body forces and shell structure in calcium isotopes
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 paper, 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.
Communicated by Professor Jacek Dobaczewski- Publication:
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Journal of Physics G Nuclear Physics
- Pub Date:
- August 2012
- DOI:
- 10.1088/0954-3899/39/8/085111
- arXiv:
- arXiv:1009.5984
- Bibcode:
- 2012JPhG...39h5111H
- Keywords:
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- Nuclear Theory;
- Astrophysics - Solar and Stellar Astrophysics;
- High Energy Physics - Phenomenology;
- Nuclear Experiment
- E-Print:
- 5 pages, 4 figures