Nature of the first excited state of He-4
Nuclear Theory
2008-11-26 v1
Abstract
We study the first excited state of He4 in a microscopic {H3+p,He3+n} cluster model, including H3 and He3 distortions. The phenomenological 1S0 H3+p scattering phase shift is well reproduced. We localize a complex pole of the S-matrix between the H3+p and He3+n thresholds. The corresponding resonance parameters are E_r=93 keV position relative to H3+p, and Gamma=390 keV width. A pole search is also performed in an extended R-matrix method, and a resonance is found with parameters E_r=114 keV and Gamma=392 keV. The R-matrix approach gives several additional poles, some of which may be connected with an enhanced threshold effect.
Cite
@article{arxiv.nucl-th/9701006,
title = {Nature of the first excited state of He-4},
author = {Attila Csoto and G. M. Hale},
journal= {arXiv preprint arXiv:nucl-th/9701006},
year = {2008}
}
Comments
13 pages, 2 figures