Heavy-Particle Stripping in the Be9(He3, α)Be8 Reaction and Energy Levels of Be8

W. E. Dorenbusch and C. P. Browne
Phys. Rev. 131, 1212 – Published 1 August 1963
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Abstract

Angular distributions of alpha particles from the Be9(He3, α)Be8 reaction leading to the ground state and the levels at 2.9, 16.6, 16.9, and 17.6 MeV were measured at bombarding energies of 3.00 and 4.00 MeV. Reaction alphas were momentum-analyzed with a broad-range spectrograph. Angular distributions for the ground state and the levels at 2.9 and 16.9 MeV are analyzed with a direct reaction theory which includes both the pickup and the heavy-particle stripping amplitudes. Yield measurements for the 17.6-MeV level were not made for angles larger than 100 deg. Over this limited range in angle the angular distributions for this level are in agreement with the predictions of Butler theory. The formation of the 16.6-MeV level apparently proceeds via the compound nucleus. Absolute differential cross sections were found by comparison with the known cross section for the Be9(d, p)Be10 reaction. Cross sections for the Be9(He3, α)Be8 reaction vary from 0.5 mb/sr to 7.6 mb/sr. The level structure of Be8 was studied from the ground state up to 17.6-MeV excitation. Levels were found at excitation energies of 2.90±0.04, 16.633±0.015, 16.928±0.015, and 17.639±0.010 MeV, with the indication of a very broad level in the region of 12.5 MeV. Widths of the 2.9-, 16.6-, and 16.9-MeV levels are 1350±150, 96±20, and 80±15 keV, respectively.

  • Received 25 March 1963

DOI:https://doi.org/10.1103/PhysRev.131.1212

©1963 American Physical Society

Authors & Affiliations

W. E. Dorenbusch and C. P. Browne

  • University of Notre Dame, Notre Dame, Indiana

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Issue

Vol. 131, Iss. 3 — August 1963

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