The Role of Three-Nucleon Forces and Many-Body Processes in Nuclear Pairing

Holt, Jason D.; Menendez, J.; Schwenk, A.

doi:10.1088/0954-3899/40/7/075105

The Role of Three-Nucleon Forces and Many-Body Processes in Nuclear Pairing

Journal Article · Tue Jan 01 04:00:00 EST 2013 · Journal of Physics. G, Nuclear and Particle Physics

DOI:https://doi.org/10.1088/0954-3899/40/7/075105· OSTI ID:1091687

Holt, Jason D. ^[1]; Menendez, J. ^[2]; Schwenk, A. ^[2]

Technische Univ. Darmstadt/GSI/UTK/ORNL
Technische Univ. Darmstadt/GSI Helmholtzzentrum fur Schweionenforschung, Germany

We present microscopic valence-shell calculations of pairing gaps in the calcium isotopes, focusing on the role of three-nucleon (3N) forces and manybody processes. In most cases, we find a reduction in pairing strength when the leading chiral 3N forces are included, compared to results with lowmomentum 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 manybody 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 54Ca.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL)

Sponsoring Organization:: DOE Office of Science; SC USDOE - Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1091687

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Journal Name: Journal of Physics. G, Nuclear and Particle Physics Journal Issue: 7 Vol. 40; ISSN 0954-3899

Country of Publication:: United States

Language:: English

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