Exact 4He Spectral Function in a Semirealistic NN Potential Model
Abstract
The spectral function of 4He is calculated with the Lorentz integral transform method in a large energy and momentum range. The excitation spectrum of the residual 3N-system is fully taken into account. The obtained spectral function is used to calculate the quasi elastic longitudinal (e,e') response R_l of 4He for q=300, 400, and 500 MeV/c. Comparison with the exact R_l shows a rather sizeable disagreement except in the quasi elastic peak, where the differences reduce to about 10% at q=500 MeV/c. It is shown as well that very simple momentum distribution approximations for the spectral function provide practically the same results for R_l as the exact spectral function.
Cite
@article{arxiv.nucl-th/9805002,
title = {Exact 4He Spectral Function in a Semirealistic NN Potential Model},
author = {V. D. Efros and W. Leidemann and G. Orlandini},
journal= {arXiv preprint arXiv:nucl-th/9805002},
year = {2008}
}
Comments
7 pages, Latex (Revtex), 4 Postscript figures, to appear in Phys. Rev. C