Masses of the unbound nuclei Ne16, F15, and O12

G. J. KeKelis, M. S. Zisman, D. K. Scott, R. Jahn, D. J. Vieira, Joseph Cerny, and F. Ajzenberg-Selove
Phys. Rev. C 17, 1929 – Published 1 June 1978
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Abstract

The (He4, He8) and (He3, Li8) reactions have been employed at detection angles near 8° on gas targets of Ne20 and O16 to produce and measure the masses of the nuclei Ne16, F15, and O12. The (He4, He8) reactions were performed at an incident energy of 117 MeV and the (He3, Li8) reaction at 88 and 75 MeV. The mass excesses of Ne16, F15, and O12 were determined to be 23.92±0.08, 16.67±0.18, and 32.10±0.12 MeV, respectively. Estimated ground state decay widths were Γc.m.=0.2±0.1, 0.8±0.3, and 0.40±0.25 MeV, for Ne16, F15, and O12, respectively. A d coefficient of 8±5 keV is indicated for the isobaric multiplet mass equation description of the mass 16 multiplet. Consideration of the possible decay mechanisms of Ne16 and O12 indicates that both nuclei probably have an appreciable diproton decay width.

NUCLEAR REACTIONS Ne20(He4, He8), O16(He4, He8), Ne20(He3, Li8). Measured reaction Q values, ground state Γc.m. deduced mass excesses. Deduced coefficients for IMME. Discuss diproton decay widths.

  • Received 20 October 1977

DOI:https://doi.org/10.1103/PhysRevC.17.1929

©1978 American Physical Society

Authors & Affiliations

G. J. KeKelis*, M. S. Zisman, D. K. Scott, R. Jahn, D. J. Vieira, and Joseph Cerny

  • Department of Chemistry and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

F. Ajzenberg-Selove

  • Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19174

  • *Present address: Williams College, Williamstown, Massachusetts 01267.
  • On leave from Institut für Strahlen-und Kernphysik Bonn, Universität Bonn, West Germany.

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Vol. 17, Iss. 6 — June 1978

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