Abstract
The () and (,′) reactions on , , , [() reaction only], , and have been investigated at energies varying between 40 and 50 MeV. Angular distributions were obtained for all prominent states up to excitations of 20 MeV. A microscopic analysis of these data has been carried out, using a local two-body interaction with an arbitrary spin-isospin exchange mixture. Spectroscopic factors were calculated, using intermediate-coupling wave functions for -shell states, while simple configurations were assumed for the levels which were populated by promoting a nucleon to the shell. A Yukawa interaction with a range of 1.2 F was found to give the best results. The strength of the effective nucleon-nucleon interaction required to fit these data is in good agreement with recent analyses of the () and () reactions on light nuclei. In particular, dominant transitions observed in the () reaction give values for the isospin-dependent () and spin-isospin-dependent () terms (converted to an effective nucleon-nucleon interaction at a range of 1.0 F) of 20.6 and 16.5 MeV, respectively, while the strengths required to fit () transitions were generally enhanced. For inelastic transitions, the average strengths obtained for , assuming a Serber exchange mixture, varied from 47.2 to 67.3 MeV, depending upon the transfer involved. A comparison of the () and (,′) reactions populating analog final states (where ) is also presented. In general, these transitions were weak; however, it was possible to observe the lowest levels in the mirror nuclei - and -, and several levels in -.
- Received 29 July 1968
DOI:https://doi.org/10.1103/PhysRev.177.1466
©1969 American Physical Society