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- Title
The electron capture of nuclides Co and Ni in the process of stellar core collapse.
- Authors
Liu, Jing-Jing
- Abstract
Using Shell-Model Monte Carlo (SMMC) method and Random Phase Approximation (RPA) theory, the electron capture (EC) and the electron capture cross section (ECCS) of nuclei Co and Ni are investigated. We also discuss the rates of the change of electron fraction (RCEF) and the error factor C, which is compared our results with those of AFUD, which calculated by the method of Aufderheide. The results show that the ECCS and the EC rates for Co and Ni increased about four orders of magnitude at relative high temperature (such as T=5,7,9). On the other hand, the RCEF for two nuclides decreased greatly, and even exceed four orders of magnitude. The error factor shows ours is agreed reasonably well with AUFD under the higher density surroundings (e.g. ρ7=106, Y=0.43; ρ7=506, Y=0.42; ρ7=4010, Y=0.41). But under the lower density surroundings (e.g. ρ7=3.36, Y=0.48) the maximum error is ∼14.5 % for Co but is ∼14.0 % for Ni. The error is ∼9.5 % and ∼9.0 % for Co, Ni at ρ7=5.86, Y=0.47 respectively.
- Subjects
ELECTRON capture; NUCLIDES; NICKEL; STELLAR evolution; COBALT; MONTE Carlo method; APPROXIMATION theory; NUCLEAR cross sections
- Publication
Astrophysics & Space Science, 2013, Vol 343, Issue 1, p117
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-012-1257-5