Study of the Reactions O18(p, n)F18, O18(p, pγ)O18, and O18(p, α1,2γ)N15 from Ep=2500 to 3000 keV

F. W. Prosser, Jr., G. U. Din, and D. D. Tolbert
Phys. Rev. 157, 779 – Published 20 May 1967
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Abstract

The reactions O18(p, n)F18, O18(p, pγ)O18, and O18(p, α1,2γ)N15 were investigated in the energy range Ep=2500 to 3000 keV by simultaneous observation of the neutrons, 1.98-MeV γ rays, and 5.30-MeV γ rays. Angular distributions of the 1.98-MeV γ rays were measured at the five prominent inelastic scattering resonances. The threshold for neutron production was found to be 2577±3 keV. The following resonances in the three decay channels were identified: (neutron) 2645, 2696, 2722, 2769, and 2926 keV; (alpha) 2645, 2769, and 2926 keV; and (proton) 2633, 2705, 2732, 2769, and 2926 keV. Spins and parities were assigned to several of these resonances: 2633, 52(+); 2645, (32); 2705, 32(+); 2732, 52(+)(72); and 2769, 52(+). All parity assignments, as well as the spin assignment of the 2645-keV resonance, are based on physical arguments. Comparison of the properties of the elastic scattering resonance at 849 keV and the resonances at 2633 (and 2732) and 2705 keV with those of the known and theoretically predicted states in O19 indicates that they are isobaric-spin analog states; however, isobaric-spin impurities are present.

  • Received 7 October 1966

DOI:https://doi.org/10.1103/PhysRev.157.779

©1967 American Physical Society

Authors & Affiliations

F. W. Prosser, Jr., G. U. Din*, and D. D. Tolbert

  • The University of Kansas, Lawrence, Kansas

  • *Now at the Australian National University, Canberra, Australia.

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Issue

Vol. 157, Iss. 4 — May 1967

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