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Title: Nuclear electron capture in a plasma

Abstract

We consider the electron density at the position of an ion of charge Ze in a plasma under conditions approximating those in the core of the Sun. Numerical calculations have shown that the plasma effects on the density, over and above the ordinary Coulomb factor for a single electron in the vicinity of the ion, are well represented by a reduction factor, exp({minus}Ze{sup 2}{beta}{kappa}{sub D}), where {beta} is the inverse temperature and {kappa}{sub D} is the Debye wavelength. Although this factor is the direct analog of the Salpeter enhancement factor for the fusion rates in stars, the elementary considerations that establish it in the fusion case are not applicable to the determination of the electron density and the resulting electron-capture rates. We show analytically, through a sum rule that leads to a well-defined perturbative approach, that in the limit of Boltzmann statistics, the Salpeter factor indeed provides the leading correction. We estimate residual effects both from Fermi statistics and from short-range terms. {copyright} {ital 1997} {ital The American Astronomical Society}

Authors:
 [1];  [2]
  1. Department of Physics, University of Washington, Seattle, Washington 98195 (United States)
  2. Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106 (United States)
Publication Date:
OSTI Identifier:
573742
DOE Contract Number:  
FG03-96ER40956
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 489; Journal Issue: 2; Other Information: PBD: Nov 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; SOLAR PARTICLES; NUCLEOSYNTHESIS; PLASMA SIMULATION; ELECTRON CAPTURE; NUMERICAL SOLUTION; BOLTZMANN STATISTICS; FERMI STATISTICS; SAHA EQUATION

Citation Formats

Brown, L S, and Sawyer, R F. Nuclear electron capture in a plasma. United States: N. p., 1997. Web. doi:10.1086/304828.
Brown, L S, & Sawyer, R F. Nuclear electron capture in a plasma. United States. https://doi.org/10.1086/304828
Brown, L S, and Sawyer, R F. 1997. "Nuclear electron capture in a plasma". United States. https://doi.org/10.1086/304828.
@article{osti_573742,
title = {Nuclear electron capture in a plasma},
author = {Brown, L S and Sawyer, R F},
abstractNote = {We consider the electron density at the position of an ion of charge Ze in a plasma under conditions approximating those in the core of the Sun. Numerical calculations have shown that the plasma effects on the density, over and above the ordinary Coulomb factor for a single electron in the vicinity of the ion, are well represented by a reduction factor, exp({minus}Ze{sup 2}{beta}{kappa}{sub D}), where {beta} is the inverse temperature and {kappa}{sub D} is the Debye wavelength. Although this factor is the direct analog of the Salpeter enhancement factor for the fusion rates in stars, the elementary considerations that establish it in the fusion case are not applicable to the determination of the electron density and the resulting electron-capture rates. We show analytically, through a sum rule that leads to a well-defined perturbative approach, that in the limit of Boltzmann statistics, the Salpeter factor indeed provides the leading correction. We estimate residual effects both from Fermi statistics and from short-range terms. {copyright} {ital 1997} {ital The American Astronomical Society}},
doi = {10.1086/304828},
url = {https://www.osti.gov/biblio/573742}, journal = {Astrophysical Journal},
number = 2,
volume = 489,
place = {United States},
year = {Sat Nov 01 00:00:00 EST 1997},
month = {Sat Nov 01 00:00:00 EST 1997}
}