Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 40, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/40/7/075105
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Funding
- BMBF [06DA70471]
- DFG [SFB 634]
- Helmholtz Association through the Helmholtz Alliance Program [HA216/EMMI]
- US DOE [DE-FC02-07ER41457, DE-FG02-96ER40963]
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We present microscopic valence-shell calculations of pairing gaps in the calcium isotopes, focusing on the role of three-nucleon (3N) forces and many-body processes. In most cases, we find a reduction in pairing strength when the leading chiral 3N forces are included, compared to results with low-momentum two-nucleon (NN) interactions only. This is in agreement with a recent energy density functional study. At the NN level, calculations that include particle-particle and hole-hole ladder contributions lead to smaller pairing gaps compared with experiment. When particle-hole contributions as well as the normal-ordered one- and two-body parts of 3N forces are consistently included to third order, we find reasonable agreement with experimental three-point mass differences. This highlights the important role of 3N forces and many-body processes for pairing in nuclei. Finally, we relate pairing gaps to the evolution of nuclear structure in neutron-rich calcium isotopes and study the predictions for the 2(+) excitation energies, in particular for Ca-54.
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