Abstract
A triple-coincidence counter telescope consisting of two thin silicon surface-barrier detectors (114 μ total thickness) and a CsI detector was used with a pulse-multiplier particle-discrimination system to detect the charged particles emanating from nuclear reactions induced by 14.1- or 14.8-MeV neutrons. Angular distributions of the outgoing charged particles from the ground-state transitions of and were measured out to a center-of-mass angle of 100° for 14.1-MeV incident neutrons. The () distribution was fitted with two theoretical curves calculated from the Butler and distorted-wave Born-approximation (DWBA) theories. The () results were fitted by two curves calculated from the double-stripping theory of Newns and the diffraction theory of Dar, and were compared to previous results obtained for . Charged particles corresponding to the excited-state transitions and were detected at forward angles. Angular distributions for the reaction were measured out to 60 degrees for MeV. The 14.8-MeV data were fitted with Butler and DWBA curves for , but the 14.1-MeV data were inconsistent with a pure-direct-reaction interpretation. The results agree with previous measurements on the inverse reaction, and indicate that a compound-nucleus mechanism contributes strongly near 14.9 MeV of excitation in the compound nucleus. Absolute reduced widths and spectroscopic factors were extracted from the fits to the reactions.
- Received 4 November 1966
DOI:https://doi.org/10.1103/PhysRev.158.948
©1967 American Physical Society