TY - JOUR
T1 - η-helium quasi-bound states
AU - Willis, N.
AU - Le Bornec, Y.
AU - Zghiche, A.
AU - Wilkin, C.
AU - Wurzinger, R.
AU - Bing, O.
AU - Boivin, M.
AU - Courtat, P.
AU - Gacougnolle, R.
AU - Hibou, F.
AU - Martin, J. M.
AU - Plouin, F.
AU - Tatischeff, B.
AU - Yonnet, J.
PY - 1997/7/31
Y1 - 1997/7/31
N2 - The cross section and tensor analysing power t20 of the d(combining right arrow above) d → 4He η reaction have been measured at six c.m. momenta, 10 ≤ pη ≤ 90 MeV/c. The threshold value of t20 is consistent with 1/√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 p d → 3He η case, strongly suggests the existence of a quasi-bound state in the η 4He system and simple optical model fits tentatively indicate that this might also be the case for η 3He.
AB - The cross section and tensor analysing power t20 of the d(combining right arrow above) d → 4He η reaction have been measured at six c.m. momenta, 10 ≤ pη ≤ 90 MeV/c. The threshold value of t20 is consistent with 1/√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 p d → 3He η case, strongly suggests the existence of a quasi-bound state in the η 4He system and simple optical model fits tentatively indicate that this might also be the case for η 3He.
KW - Meson production threshold
KW - η meson
KW - η-nucleus quasi-bound states
U2 - 10.1016/S0370-2693(97)00650-3
DO - 10.1016/S0370-2693(97)00650-3
M3 - Article
AN - SCOPUS:0002413796
SN - 0370-2693
VL - 406
SP - 14
EP - 19
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -