The cross sections for the weak proton capture reactions p+p→d++ and pHeHe++ have been calculated with realistic wave functions determined by using the Argonne nucleon-nucleon interaction. To minimize the uncertainty in the axial exchange current operator, its matrix element has been adjusted so as to reproduce the measured Gamow-Teller matrix element for β decay of tritium. The exchange current contribution enhances the calculated rate of the pp capture reaction by 1.5% and decreases that of the He reaction by almost a factor of 5.
- Received 11 January 1991
- Published in the issue dated August 1991
© 1991 The American Physical Society