Eta-Helium Quasi-Bound States

Details Eta-Helium Quasi-Bound States Eta-Helium Quasi-Bound States

1997-03-12

arxiv.org/abs/nucl-ex/9703002v1

Phys.Lett.B406:14-19,1997

Physics

Nuclear Physics

Nuclear Experiment

LaTeX, uses elsart.sty, 10 pages, 3 Postscript figures, Submitted to Physics Letters B

Scientific paper

10.1016/S0370-2693(97)00650-3

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.

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