Abstract
was investigated by the and reactions at Van de Graaff bombarding energies of 17 and 12 MeV, respectively. Particle analysis for the stripping study employed nuclear emulsions in an Enge split-pole spectrograph and yielded 10-12-keV resolution for the detected protons of 21-24 MeV. Comparison of measured () angular distributions with nonlocal, finite-range distorted-wave Born-approximation (DWBA) calculations led to -value assignments, limits, and spectroscopic strengths for 34 transitions. The deduced values were 0.42 for 2d states and 0.80 for the neutron orbital and agree to within 10% with our ()-derived occupancies for the same target. The low yield at 12-MeV incident energy necessitated use of thick targets (130 μg/) and large solid angles, which led to resolutions of about 35-40 keV for Si counter data and 20 keV for spectrograph analysis. Angular distributions for ten () transitions were measured out to 150° and compared with local, zero-range DWBA predictions. Based on a macroscopic triton-transfer model, these calculations were particularly successful in duplicating the dependence observed in the ground-state transition. A modified -level scheme incorporating our results with the previous literature is presented and includes 20 new states from the present studies.
- Received 12 June 1969
DOI:https://doi.org/10.1103/PhysRev.188.1881
©1969 American Physical Society