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Nuclear Reactions Induced by the Nitrogen Bombardment of Sulfur

D. E. Fisher* and A. Zucker

A. Gropp

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee

  • University of Florida, Gainesville, Florida

  • *Oak Ridge Institute of Nuclear Studies Fellow from the University of Florida. Present address: Brookhaven National Laboratory, Upton, New York.
  • Operated for the U. S. Atomic Energy Commission by Union Carbide Corporation.

Phys. Rev. 113, 542 – Published 15 January, 1959

DOI: https://doi.org/10.1103/PhysRev.113.542

Abstract

Thick targets of ZnS, containing natural sulfur, were bombarded with 28-Mev nitrogen ions in the ORNL 63-in. cyclotron. The compound nucleus resulting from bombardment of sulfur-32 with 28-Mev nitrogen ions is V46, with an excitation energy of 33.3 Mev. The following nuclear reactions were studied: (1) S32(N14, p)Ti45; (2) S32(N14, 2p)Sc44; (3) S32(N14, 2p)Sc44m; (4) S32(N14, 2pn)Sc43; (5) S32(N14, 2α)K38m; and (6) S32(N14,N13)S33. The yields as a function of incident energy for these reactions were differentiated to obtain excitation functions. The cross sections for (1), (2 and 3), and (5) are compared with calculations based on the statistical theory of compound nucleus decay. Two values of the level density parameter, a, were employed, first considering and then ignoring de-excitation of a nucleus by gamma-ray emission. The value a=A10.5 fits the p and 2p emission cross sections when gamma emission is considered. The excitation function for reaction (6) agrees well with the systematics of previously studied nitrogen-induced transfer reactions.

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