F19 (He3,d)Ne20 Reaction at 20-23 MeV

A. W. Obst and K. W. Kemper
Phys. Rev. C 8, 1682 – Published 1 November 1973
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Abstract

14 deuteron groups populating levels to 10.26 MeV excitation in Ne20 have been measured with the F19 (He3,d)Ne20 reaction. Excitation functions measured at θlab=25 and 45 from 20.0 to 21.2 MeV reveal little structure, and therefore probably little compound-nuclear contribution to the observed cross sections for the deuteron groups. In particular, the 2 level at 4.97 MeV excitation, strongly populated at E3He=10 MeV, is weakly populated in the present energy range. The "j-forbidden" 4+ level at 4.25 MeV excitation, on the other hand, is strongly populated in the present energy range. A collective-model coupled-channel Born-approximation analysis of angular distributions measured at E3He=21 and 23 MeV is better able to explain the data than distorted-wave Born-approximation analysis for the positive-parity states. The negative-parity states are poorly described by both theories.

[NUCLEAR REACTIONS F19 (He3,d), E=2023 MeV; measured σ(E,θ), deduced S. DWBA and CCBA analysis; θ=20150, Δθ=5.]

  • Received 20 July 1973

DOI:https://doi.org/10.1103/PhysRevC.8.1682

©1973 American Physical Society

Authors & Affiliations

A. W. Obst* and K. W. Kemper

  • Department of Physics, The Florida State University, Tallahassee, Florida 32306

  • *Present address: Physics Department, University of Texas, Austin, Texas 78712.

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Vol. 8, Iss. 5 — November 1973

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