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Willis, N.; Le Bornec, Y.; Zghiche, A.; Wilkin, C.; Wurzinger, R.; Bing, O.; Boivin, M.; Courtat, P.; Gacougnolle, R.; Hibou, F.; Martin, J.M.; Plouin, F.; Tatischeff, B.; Yonnet, J.
Physics letters. B, 07/1997, Letnik: 406, Številka: 1Journal Article
The cross section and tensor analysing power t 20 of the dd → 4 Heη reaction have been measured at six c.m. momenta, 10 ⩽ p η ⩽ 90 MeV/ c. The threshold value of t 20 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 pd → 3 Heη 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.
