Eta-Helium Quasi-Bound States
Nuclear Experiment
2008-11-26 v1 High Energy Physics - Experiment
Nuclear Theory
Abstract
The cross section and tensor analysing power t_20 of the d\vec{d}->eta 4He reaction have been measured at six c.m. momenta, 10 < p(eta) < 90 MeV/c. The threshold value of t_20 is consistent with 1/\sqrt{2}, which follows from parity conservation and Bose symmetry. The much slower momentum variation observed for the reaction amplitude, as compared to that for the analogous pd->eta 3He case, suggests strongly the existence of a quasi-bound state in the eta-4He system and optical model fits indicate that this probably also the case for eta-3He.
Keywords
Cite
@article{arxiv.nucl-ex/9703002,
title = {Eta-Helium Quasi-Bound States},
author = {N. Willis and Y. Le Bornec and A. Zghiche and C. Wilkin and R. Wurzinger and O. Bing and M. Boivin and P. Courtat and R. Gacougnolle and F. Hibou and J. M. Martin and F. Plouin and B. Tatischeff and J. Yonnet},
journal= {arXiv preprint arXiv:nucl-ex/9703002},
year = {2008}
}
Comments
LaTeX, uses elsart.sty, 10 pages, 3 Postscript figures, Submitted to Physics Letters B