Abstract
The cross section for excitation of the 0.72-Mev gamma ray in the reaction has been measured for neutron bombarding energies from threshold to 5.2 Mev. Resonances were observed at 1.93 Mev, 3.31 Mev, 4.1 Mev, and 4.73 Mev, with evidence of a broad resonance at 2.6 Mev. The angular distributions of the 0.110-Mev and 0.197-Mev gamma rays in the reaction and the 0.847-Mev gamma ray in the reaction were also measured at a neutron energy of 2.56 Mev. The first of these was isotropic, as would be expected for the decay of a spin-½ level; the last two showed anisotropies but were symmetrical about 90°. The angular distribution of the gamma ray agrees very well in both shape and absolute magnitude with calculations based on the statistical model. Since this model predicts angular distributions for that have a strong dependence on the spin assumed for the excited state, it appears that such angular distribution measurements may be a useful technique in nuclear spectroscopy.
- Received 21 September 1959
DOI:https://doi.org/10.1103/PhysRev.117.1330
©1960 American Physical Society