Abstract
The radioactive nuclide has been produced in the reaction by 5.2-Mev particles from the NRL 5-Mv Van de Graaff accelerator. The target, CaO on a Pt backing, was about 300 kev thick to the incident beam. The gamma rays following the decay of were detected by a 3-in. diam by 3-in. NaI(Tl) crystal and a 256-channel pulse-height analyzer. Only one nuclear gamma ray was observed. Its energy, measured with respect to the gamma ray at 1.2736±0.0016 Mev, is 1.041±0.005 Mev. Therefore, this gamma ray is assigned to the 1.04-Mev state of . This state is considered to be the isobaric spin analog state of the ground state, and therefore has quantum parameters , . The branching to this excited state was measured to be 0.07±0.02 (including a calculated contribution of 0.00006 from orbital electron capture), and that to the ground state of was measured to be 0.93±0.02 (including a calculated contribution of 0.0002 from orbital electron capture). The values are, respectively, 3030±880 and 1120±70 sec. The half-life of was measured to be 1.46±0.07 sec.
- Received 2 November 1960
DOI:https://doi.org/10.1103/PhysRev.121.1782
©1961 American Physical Society