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Nucleon Transfer in B10(N14,N13)B11, B10(N14,C11)C13, and Ca40(N14,N13)Ca41 Reactions

J. G. Couch* and J. A. McIntyre†

J. C. Hiebert‡

  • Texas A&M University, College Station, Texas

  • Oak Ridge National Laboratory, Oak Ridge, Tennesee

  • *Oak Ridge Graduate Fellow from Texas A&M University under appointment from the Oak Ridge Associated Universities. Present address: Physics Department, Washington State University, Pullman, Washington.
  • †Partially supported by an Oak Ridge Associated Universities research participation contract.
  • ‡U. S. Atomic Energy Commission Postdoctoral Fellow under appointment from the Oak Ridge Associated Universities, 1963-1965. Present address: Physics Department, Texas A&M University, College Station, Texas.
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Phys. Rev. 152, 883 – Published 16 December, 1966

DOI: https://doi.org/10.1103/PhysRev.152.883

Abstract

Thin targets of B10 and Ca40 were bombarded with N14 ions from the Oak Ridge tandem van de Graaff accelerator. Ranges, angular distributions dσ(θ)dΩ, and total cross sections σ(E) were obtained by measuring the activities of the positron emitters N13 and C11 formed in the neutron and proton transfer reactions. The B10(N14,N13)B11 reaction was shown to involve primarily ground states of B11 at an incident energy of 16.3 MeV. The angular-distribution data for this reaction were found, in their dependence on angle, to be consistent with tunneling-theory calculations. [Although cross-section calculations with the tunneling theory have been limited to the N14(N14,N13)N15 reaction, the angular dependence calculated for the differential cross section can be used for other reactions.] A reduced width for the transferred neutron could not be determined, however, because of the specialization of the calculations to the N14(N14,N13)N15 reaction. In the B10(N14,C11)C13 reaction, the protons transfer to both the ground state and first excited state of C13, but no transfers involving the first excited state of C11 were observed. For the Ca40(N14,N13)Ca41 experiments, reactions were found at the higher energies measured (>27.5 MeV) which led to excited states as well as to the ground state of Ca41. Again, the angular distributions were found to be consistent with the tunneling process. Total-cross-section data were also obtained which can be used for a neutron reduced-width determination in Ca41 when the theory has been extended to this reaction (with the reservation that there is no evidence available that only one state in Ca41 is involved in the transfer-process energies below 27.5 MeV).

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References (19)

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  13. Omitted endnote

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Phys. Rev. 152, 883– Published 16 December, 1966
  • Received 29 July 1966

© 1966 American Physical Society

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