Elsevier

Nuclear Physics

Volume 46, July–September 1963, Pages 336-352
Nuclear Physics

A study of the reactions Be9(He3,n)C11, Li7(He3,n)B9 and C13(He3,n)O15

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Abstract

Time-of-flight techniques with time resolution capabilities of 4 ns for neutrons have been used to study (He3,n) reactions with the following targets: Be9, Li7 and C13. The angular distributions of neutrons to the ground state and the first four excited states (2.00, 4.32, 4.81 and the unresolved doublet at 6.35 and 6.49 MeV) of C11 have been measured for the reaction Be9 (He3,n)C11 at an incident He3 energy of 2.1 MeV. Excitation functions were measured for these states for EHe3 from 1.2 to 2.7 MeV at laboratory angles of 0° and 81.5°. For the Li7 (He3,n)B9 reaction an angular distribution was measured at EHe3=2.1 MeV for the ground state neutron group from B9 and the yield curve was measured for this group from 1.2 to 2.7 MeV at 0°. For the C13(He3,n)O15 reaction resolved neutron groups were seen for transitions to the ground and third excited states (6.15 MeV) in O15. Excitation functions were measured at laboratory angles of 0° and 90° for this reaction for EHe3 from 1.2 to 2.7 MeV and angular distributions were measured at EHe3=2.66 MeV. Distorted wave calculations have been made in an attempt to describe all of the reactions. In general, the calculations can be made to fit the angular distributions quite well in the forward direction but the back angle cross sections predicted by the calculations are usually much lower than the measured values. Tentative spin and parity assignments are given for the resolved groups.

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    ††

    ORINS Summer Research Participants from the University of Kentucky.

    †

    ORINS Graduate Fellow from Louisiana State University. Present address; Physics Dept., University of Georgia, Athens, Georgia.

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