Angular Distribution of Alphas from Li6(d,α)α and Li7(p,α)α

N. P. Heydenburg, C. M. Hudson, D. R. Inglis, and W. D. Whitehead, Jr.
Phys. Rev. 74, 405 – Published 15 August 1948
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Abstract

The intensity of the reaction Li6(d,α)α is observed to vary with angle as 1+A(E)cos2θ+B(E)cos4θ, as expected from the Bose statistics of the product alphas, with A(E) rising gradually beginning just below 1 Mev to a broad maximum a little below unity at a bombarding energy E in the neighborhood of 2 Mev. The coefficient B(E) remains zero up to almost 1.5 Mev and rises to a positive value of about 0.35 at higher energies. The yield curve observed at right angles to the beam displays a sharp maximum at 0.75 Mev and there is evidence of approach to another peak at or just beyond the highest bombarding energy employed, 3.75 Mev. The substitution of a proportional counter for the ionization chamber used in earlier work has made possible improvement over our earlier observations of the angular distribution of the reaction Li7(p,α)α in the neighborhood of 3 Mev, where difficulty was experienced in the discrimination against pile-up of scattered protons, and the new results show a node in the curve for A(E) at 2.7 Mev. A peak in the yield curve of this reaction is found at 3 Mev, which is about 3 Mev lower in the compound nucleus Be8 than the lower peak observed in the reaction Li6(d,α)α. There is great similarity in the trends of the angular distributions of the two reactions, but their coefficients B(E) have opposite signs in the energy regions investigated, and both A(E) and B(E) rise from zero more gradually in Li6(d,α)α than in Li7(p,α)α as the bombarding energy increases from low values.

  • Received 10 May 1948

DOI:https://doi.org/10.1103/PhysRev.74.405

©1948 American Physical Society

Authors & Affiliations

N. P. Heydenburg, C. M. Hudson*, D. R. Inglis, and W. D. Whitehead, Jr.

  • Carnegie Institution of Washington, Department of Terrestrial Magnetism, Washington, D. C.

  • *Office of the Chief of Ordnance, War Department, Washington, D. C.
  • Johns Hopkins University, Baltimore, Maryland.
  • Carnegie Institution Fellow.

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Vol. 74, Iss. 4 — August 1948

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