Abstract
Electromagnetic and transitions in the seven-nucleon systems, the radiative-capture problem, and the electron-capture reaction of into are studied. The wave functions employed are from a previous single-channel resonating-group calculation which yielded satisfactory results for the + and + scattering cross sections and polarizations. With no adjustable parameters, the calculated and values for transitions between the ground and first excited states of or are found to agree rather well with values empirically determined. The study shows, in particular, that the nuclei and must have strong collective features, which are describable in terms of plus three-nucleon clustering. The cross-section factor , important in astrophysical considerations, is determined to have a value between 0.5 and 0.6 keV b. For the electron-capture reaction, the calculated value of the branching ratio to the first excited state of is 10.31%, which is in very good agreement with the measured value of 10.36±0.10% reported prior to 1982.
NUCLEAR REACTIONS , (), ;; calculated capture cross section, , and with resonating-group wave functions.
- Received 4 March 1983
DOI:https://doi.org/10.1103/PhysRevC.28.57
©1983 American Physical Society