Experimental Study of the O17(p, α)N14 Reaction and a Calculation of the Rate of this Reaction in the CNO Cycle in Stars

Phys. Rev. 125, 347 – Published 1 January 1962
Ronald E. Brown

Abstract

An experimental measurement of the absolute cross section for the O17(p, α)N14 reaction has been carried out in the energy range from 490- to 1580-kev proton bombarding energy at a laboratory angle of 150°. Resonances were observed at proton energies of 518, 672, 747, 825, 927, 1096, 1101, 1247, 1274, and 1335 kev. Other level parameters were assigned where possible. The 747-kev resonance corresponds to a level in F18 at 6302-kev excitation which does not appear to have been previously reported. A calculation of the ratio O17/O16 formed at equilibrium at various temperatures in the CNO cycle in stars is made, and it is concluded that the terrestrial material which has been processed in the CNO cycle underwent this processing at a temperature of about 17×106 °K.

DOI: http://dx.doi.org/10.1103/PhysRev.125.347

  • Received 7 August 1961
  • Published in the issue dated January 1962

© 1962 The American Physical Society

Authors & Affiliations

Ronald E. Brown*

  • California Institute of Technology, Pasadena, California

  • *National Science Foundation Predoctoral Fellow. Present address: Department of Physics, University of Washington, Seattle, Washington.

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