Abstract
A double proportional counter-scintillator telescope was employed to study the angular distributions of deuterons produced by 14.1-MeV neutron-induced pickup reactions on natural targets of , , and . Measurements were taken at intervals of 5°-15° over the laboratory range 0°-150°. Simultaneous measurements of and permitted separation of particles of different . Five angular distributions of deuterons corresponding to three ground-state and two excited-state transitions were obtained. Absolute center-of-mass differential cross sections were assigned. Neither significant isotropic contributions nor back-angle yields were observed. All spin and parity assignments were consistent with accepted values. Absolute reduced widths were extracted by the peak-fitting method and the Amado extrapolation procedure. Comparison of experimental and shell-model values (relative reduced widths), in addition to observed -forbidden transitions, clearly indicated appreciable core excitations in the ground-state configurations of and . The (gnd.) measurements revealed a gross discrepancy in a previously reported cross section for the inverse reaction. An anomalously large reduced width for the transition to the 3.68-MeV level of was qualitatively confirmed.
- Received 9 October 1962
DOI:https://doi.org/10.1103/PhysRev.129.1728
©1963 American Physical Society