Using Continuum Level Density in the Pairing Hamiltonian: BCS and Exact Solutions

Details Using Continuum Level Density in the Pairing Hamiltonian: BCS and Exact Solutions Using Continuum Level Density in the Pairing Hamiltonian: BCS and Exact Solutions

2011-12-14

arxiv.org/abs/1112.3178v2

Nuclear Physics A 879, 14, 2012

Physics

Nuclear Physics

Nuclear Theory

15 pages, 5 figures, accepted in Nucl. Phys. A

Scientific paper

10.1016/j.nuclphysa.2012.01.026

Pairing plays a central role in nuclear systems. The simplest model for the pairing is the constant-pairing Hamiltonian. The aim of the present paper is to include the continuum single particle level density in the constant pairing Hamiltonian and to make a comparison between the approximate BCS and the exact Richardson solutions. The continuum is introduced by using the continuum single particle level density. It is shown that the continuum makes an important contribution to the pairing parameter even in those case when the continuum is weakly populated. It is shown that while the approximate BCS solution depends on the model space the exact Richardson solution does not.

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