The new data on the process dp to 3 He eta at threshold are analysed in terms of a two-body reaction mechanism involving pi , eta and rho exchange. D-state effects are included within a two-body cluster model for the 3 He nucleus. In contrast to the dp to 3 He pi 0 case, the reaction rate is underestimated and the deuteron tensor analysing power t 20 only weakly reproduced. This and other evidence suggests the three-nucleon mechanisms play an important role here.
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Germond et al. (1989) studied this question.
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