Abstract
The ground-state transition from the 13.51-Mev state of formed by bombarding fluorine with protons of 669 kev is anomalously weak. This is interesting because the 13.51-Mev state has a large reduced width for proton emission to the ground state of and a large width for radiation to the first excited (1.63-Mev) state of . A simple explanation would be that the ground state of is close to . The ground-state radiation is sought and found using a 3-in.×3-in. NaI(Tl) crystal. The radiative width is approximately 1.0× ev corresponding to . The 13.51-Mev state is found also to radiate to the 4.97-Mev state with a width of approximately 0.24 ev. The 4.97-Mev state itself chiefly cascades via the first excited state: An upper limit on the relative strength of the ground-state transition is 0.07.
- Received 13 June 1960
DOI:https://doi.org/10.1103/PhysRev.120.952
©1960 American Physical Society