RESONANCES IN THE REACTIONS Si$sup 28$ + p
Resonances in the gamma -ray yield were observed at bombarding energies of 1.653 plus or minus 0.005, 2.09 plus or minus 0.015, and 2.30 plus or minus 0.015 Mev. They correspond to energy levels in P/sup 29/ at 4.320 plus or minus widths of 55.2 plus or minus 2, 14 plus or minus 2, and less than 4 kev, respectively. Capture gamma radiation proceeding predominantly to the ground state of P/sup 29/ was observed from the two lower resonances. The 4.94 Mev resonance showed only radiation corresponding to that from the first excited state of Si/sup 28/. The angular distribution of the gamma rays at the 1.65- Mev resonance shows that the 4.320 Mev state has spin 3/2. Considerations of reduced widths indicate that it has odd parity and is of the "single particle" type. Strong interference effects were observed in the angular distributions at off resonant energies. It seemed likely that this interference occurs mainly with the hard sphere part of the direct electric dipole capture process. A cross section of (1.3 plus or minus 0.4) mu barns was obtained for this process at 1.65-Mev bombarding energy on the assumption that all of the interference arises from this source. A value of 1.75 plus or minus 0.35 ev was obtained for the radiative width r of the 4.320-Mev state. The angular distribution of the gamma rays at the 2.09-Mev resonance was also shown to be anisotropic, but the anisotropy may still be consistent with the previously reported spin of 1/2 + for the 4.74-Mev state. A value of 0.9 plus or minus 0.4 ev was obtained for the radiative width (2J + l) GAMMA gamma of this state. (auth)
- Research Organization:
- Atomic Energy Research Establishment, Harwell, Berks, Eng.
- NSA Number:
- NSA-15-010032
- OSTI ID:
- 4087095
- Journal Information:
- Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 21
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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