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HK: Fachverband Hadronen und Kerne
HK 83: Nuclear Structure and Dynamics II
HK 83.4: Talk
Friday, March 20, 2009, 12:15–12:30, H-ZO 50
Isospin Dependent Pairing Interactions and BCS-BEC crossover — •J. Margueron1,2, H. Sagawa2, and K. Hagino3 — 1IPN, Universite Paris-Sud, IN2P3-CNRSF-Orsay Cedex, France — 2University of Aizu, Aizu-Wakamatsu, Fukushima, Japan — 3Tohoku University, Sendai, Japan
We propose new types of density dependent contact pairing interaction which reproduce the pairing gaps in symmetric and neutron matters obtained by a microscopic treatment based on the nucleon-nucleon interaction. The BCS-BEC crossover of neutrons pairs in symmetric and asymmetric nuclear matters is studied by using these contact interactions. It is shown that the bare and screened pairing interactions lead to different features of the BCS-BEC crossover in symmetric nuclear matter. We perform Hartree-Fock-Bogoliubov (HFB) calculations for semi-magic Calcium, Nickel, Tin and Lead isotopes and N=20, 28, 50 and 82 isotones using these density-dependent pairing interactions. Our calculations well account for the experimental data for the neutron number dependence of binding energy, two neutrons separation energy, and odd-even mass staggering of these isotopes. Especially the interaction IS+IV Bare without the medium polarization effect gives satisfactory results of all the isotopes.