η-helium quasi-bound states

Authors :: P. Courtat
R. Gacougnolle
Jérôme Martin
O. Bing
N. Willis
F. Plouin
Colin Wilkin
J. Yonnet
B. Tatischeff
F. Hibou
Y. Le Bornec
A. Zghiche
R. Wurzinger
M. Boivin
Institut de Physique Nucléaire d'Orsay (IPNO)
Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Institut de Recherches Subatomiques (IReS)
Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)
Source :: Physics Letters B, Physics Letters B, Elsevier, 1997, 406, pp.14-19
Publication Year :: 1997
Publisher :: Elsevier BV, 1997.
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.<br />LaTeX, uses elsart.sty, 10 pages, 3 Postscript figures, Submitted to Physics Letters B

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