Deuterium He3 Reaction

W. E. Kunz
Phys. Rev. 97, 456 – Published 15 January 1955
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Abstract

By the use of accelerated He3 ions, the reaction H2(He3, p)He4 has been studied in the energy range 100-800 kev (He3 energy). The angular distribution of the protons was found to be isotropic at bombarding energies of 200, 290, and 350 kev. The reaction cross section has a peak of 695±14 millibarns as determined with reference to the peak value 5.00 barns for the comparison reaction, H3(H2, n)He4. The comparison was effected by alternately bombarding the same deuterium target with tritium and He3 ions, and counting the alpha particles. The peak occurred at 640-kev He3 ion bombarding energy.

From considerations of the absolute value of the cross section, it is concluded that the resonance at 640 kev is associated with a J=32 level in the compound nucleus. The experimental shape of the peak is well fitted by resonance parameters in the one-level dispersion formula having the following values: interaction radius R, 5×1013 cm; reduced width for proton emission γp, 41.9 kev; reduced scattering width γα, 2930 kev; "formal" resonance energy in the center-of-mass system εs, 391 kev; energy of the level above the ground state of Li5: 16.2±0.3 Mev. These values agree within experimental error with analogous values associated with the similar resonance which occurs in the H2(H3, n)He4 reaction.

  • Received 29 September 1954

DOI:https://doi.org/10.1103/PhysRev.97.456

©1955 American Physical Society

Authors & Affiliations

W. E. Kunz*

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee

  • *Oak Ridge Institute of Nuclear Studies Fellow now at the Naval Research Laboratory, Washington, D. C.

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Issue

Vol. 97, Iss. 2 — January 1955

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