The cross section for the proton weak capture reaction is calculated with wave functions obtained from a number of modern, realistic high-precision interactions. To minimize the uncertainty in the axial two-body current operator, its matrix element has been adjusted to reproduce the measured Gamow-Teller matrix element of tritium decay in model calculations using trinucleon wave functions from these interactions. A thorough analysis of the ambiguities that this procedure introduces in evaluating the two-body current contribution to the capture is given. Its inherent model dependence is in fact found to be very weak. The overlap integral for the capture is predicted to be in the range 7.05–7.06, including the axial two-body current contribution, for all interactions considered.
- Received 2 April 1998
- Published in the issue dated August 1998
© 1998 The American Physical Society