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Title: Pairing gap in the inner crust of neutron stars

The pairing gap in the inner crust of a neutron star can be strongly affected by the presence of heavy nuclei. The effect is commonly estimated in a semiclassical description, using the local density approximation. It was found that the nuclear specific heat can become comparable to the electronic specific heat at certain densities and temperatures. The quantitative result depends critically upon the magnitude of the pairing gap. We therefore decided to assess the validity of the semiclassical approach. This is done by solving the quantal BCS pairing gap equation for neutrons that are confined to the Wigner-Seitz cell that surrounds a heavy nucleus. We performed calculations that are based on the Gogny pairing force. They are feasible for realistic densities of neutrons and heavy nuclei that are expected to be found in the inner crust of neutron stars. The results will be compared to the semiclassical predictions. This work is in progress.
Authors:
; ;  [1] ;  [2]
  1. Instituto of Nazionale di Fisica Nucleare, Milano (Italy)
  2. Univ. of Sevilla (Spain)
Publication Date:
OSTI Identifier:
166474
Report Number(s):
ANL--95/14
ON: DE96000985; TRN: 95:007970-0190
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Aug 1995; Related Information: Is Part Of Physics Division Annual Report, April 1, 1994--March 31, 1995; Henning, W.F.; PB: 207 p.
Research Org:
Argonne National Lab., IL (United States)
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; NEUTRON STARS; PAIRING ENERGY; HEAVY NUCLEI; PAIRING INTERACTIONS; PROGRESS REPORT; SPECIFIC HEAT