STUDY OF LEVELS IN O$sup 18$ THROUGH THE RADIATIVE CAPTURE OF ALPHA PARTICLES BY C$sup 1$$sup 4$
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
S>Two resonances in the reaction C/sup 14/( alpha , )O/sup 18/ have been studied at laboratory alpha-particle energies of 1.142 sintering time 0.010 and 1.790 sintering time 0.010 Mev. These correspond to excited states in O/ sup 18/ at 7.127 and 7.630 Mev. At the upper resonance only two primary transitions are observed leading to the ground state of O/sup 18/ and the first excited state at 1.98 Mev. Their angular distributions along with other evidence unambiguously establish spins and parities of 1- for the 7.63-Mev state, 2+ for the 1.98Mev state, and 0+ for the ground state. Values of = vely, are obtained for the 7.63- and 5.65-Mev E1 primary transitions. At the lower resonance again only two primary transitions are observed leading to levels in O/ sup 18/ at 1.98 and 3.55 Mev. Greater than 96% of the decays of the 3.55-Mev level lead to the 1.98-Mev level. Analysis of the angular distributions of the four gamma rays observed in the direct spectrum at this resonance, with respect to the incident beam, unambiguously es tablish spin and parity of 4+ to both the capturing state at 7.13 Mev and the level at 3.55 Mev. Values of of 15 and 12 millielectron volts, respectively, are obtained for the 3.58-Mev M1 and the 5.15-Mev E2 primary transitions. The amount of E2 mixing in the former transition is very small. (auth)
- Research Organization:
- Atomic Energy of Canada, Chalk River, Ont.
- NSA Number:
- NSA-13-012132
- OSTI ID:
- 4271757
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 113; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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