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Studies on the Low-Lying Levels of Ne24

A. J. Howard*, R. G. Hirko, and D. A. Bromley

K. Bethge and J. W. Olness

  • Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520

  • Brookhaven National Laboratory, Upton, New York, 11973

  • *Permanent address: Trinity College, Hartford, Conn. 06106.
  • Present address: Department of Physics, Stanford University, Stanford, Calif. 94305.
  • Summer visitor (1968) from the University of Pennsylvania, Philadelphia, Pa. Permanent address: Universität Heidelberg, Heidelberg, Germany.

Phys. Rev. C 1, 1446 – Published 1 April, 1970

DOI: https://doi.org/10.1103/PhysRevC.1.1446

Abstract

Angular-distribution measurements have been performed on the Ne22(t, p)Ne24 reaction at Et=3.3 MeV. Formation of the ground and 4.76-MeV Ne24 states is characterized by l=0 transfer, which establishes Jπ=0+ for these two states. The J=2, 3.87-MeV state was observed to be formed via l=2 transfer, and so even parity is indicated for this state. Proton-γ angular-correlation experiments were carried out in method II geometry at Et=3.45 and 3.33 MeV. These results establish unambiguous J=4 and 2 assignments for the respective 3.96- and 5.58-MeV levels of Ne24. The present experimental information on the static properties of Ne24 is shown to be consistent with a jj coupling-model representation involving pure twobody proton configurations. An intercomparison of the observed static properties associated with the low-lying levels of the even-A neon isotopes is presented, and a remarkable similarity is shown to exist between the low-lying level structures of O18 and Ne24. It is concluded that 1d52 subshell closure effects underlie the Ne24 spectrum.

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