Two-body Pion Absorption on 3He at Threshold
L. L. Kiang, T. -S. H. Lee, D. O. Riska
Abstract
It is shown that a satisfactory explanation of the ratio of the rates of the reactions 3He(π-,nn) and 3He(π-,np) for stopped pions is obtained once the effect of the short range two-nucleon components of the axial charge operator for the nuclear system is taken into account. By employing realistic models for the nucleon-nucleon interaction in the construction of these components of the axial charge operator, the predicted ratios agree with the empirical value to within 10-20\%.
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