Abstract
Energy levels in have been investigated by observing the neutrons from the reaction and the rays from the reaction in the range of bombarding energy from 2 Mev to 5 Mev. At Mev both the neutrons and the rays are resonant. The width of the -ray peak is 38±3 kev while the width of the neutron peak is 85±10 kev. The results are analyzed in terms of two states at 8.89 Mev which probably are the analogs to the 7.37- and 7.54-Mev states in . The neutron reduced widths for the states are in good agreement with those for the states (which is to be expected on the basis of charge symmetry of nuclear forces) if the neutron and -ray resonances have , and , , respectively. In addition, a broad resonance in the neutron yield at near 3.2 Mev indicates a wide level ( Mev) in at 9.5 Mev. Angular distributions of the neutrons have been measured and total cross sections obtained at bombarding energies of 2.56, 2.92, 3.06, 3.56, and 4.56 Mev.
- Received 23 April 1956
DOI:https://doi.org/10.1103/PhysRev.103.713
©1956 American Physical Society