Angular Distributions and Total Cross Sections of Reactions of Li6, Li7 on B10, B11

Robert L. McGrath
Phys. Rev. 145, 802 – Published 20 May 1966
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Abstract

Charged particles from four sets of reactions induced by Li6, Li7 on B10, B11 targets have been observed. The incident beam energy in each case corresponds to 3.05 MeV in the center-of-mass system. A dEdx, E counter coupled to an on-line computer is used to obtain 115 angular distributions and absolute cross sections of p, d, t, He3, and He4 particles. N14, N15, N16, and C13 are formed in several different reactions. The observed relative cross sections are often independent of the mode of formation. Cross sections for low-lying states of these nuclei, and C12, C14 are closely proportional to (2J+1) where J is the spin of the residual state. On this basis it is suggested that the statistical compound nucleus mechanism dominates the cross sections to many low-lying states. At high-level excitations, yields typically deviate upwards from (2J+1) dependence. The N15 9.16-MeV and N14 9.13-, 10.09-, and 11.06-MeV states have very large yields in the (Li6, d), (Li7, t) reactions. At these higher excitations direct reactions evidently supplement the statistical yields. Unambiguous evidence for the following unreported levels is found: 7.17±0.04, 7.37, 8.14, 8.55, 8.93, 9.26, and 9.74 MeV in N17; 7.66±0.05, 8.10, 8.36, 8.83, and 9.47 MeV in N16; and 10.79±0.03 MeV in N14 (previously reported as 10.71±0.09 MeV).

  • Received 3 January 1966

DOI:https://doi.org/10.1103/PhysRev.145.802

©1966 American Physical Society

Authors & Affiliations

Robert L. McGrath*

  • Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa

  • *Present address: Lawrence Radiation Laboratory, Berkeley, California.

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Issue

Vol. 145, Iss. 3 — May 1966

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