Structural connection of highly deformed shape isomeric states in Si28, Mg24, and Ne20 by alpha-alpha coincidence studies in C12(16O,α)24Mg*→α+20Ne*

Suresh Kumar, M. A. Eswaran, E. T. Mirgule, D. R. Chakrabarty, V. M. Datar, N. L. Ragoowansi, U. K. Pal, and H. H. Oza
Phys. Rev. C 50, 1535 – Published 1 September 1994
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Abstract

Alpha-alpha coincidence measurements have been made in the reaction C12(16O,α)24Mg*→α+20Ne* at the bombarding energy of E(16O)=63 MeV corresponding to the resonance in the C12+16O system at Ec.m.=26.9 MeV leading to the compound nuclear state at 43.7 MeV in Si28. The coincidence alphas are detected, one at 0° to the beam and the other at 20° to 80° in steps of 10°. The spins of the states in Mg24 at 20.2 and 21.4 MeV are fed strongly at this resonance are inferred to be J≥8 from the branching of these states to the states in the ground state band of Ne20. From the result it is deduced that these states of Mg24 do not correspond to the near Coulomb barrier resonances in the C12+12C system. In addition, the coincidence measurements also lead to the result that the states of Mg24 in the 20–22 MeV region fed at the resonance preferentially decay to the eight-particle–four-hole states of Ne20 near 7.2 MeV. These results establish the structural connection of highly deformed shape isomeric states in the region of ε=1.17 to 1.35 and γ=50° to 60° in Si28, Mg24, and Ne20 expected from the Nilsson-Strutinsky calculations of Leander and Larsson.

  • Received 5 April 1994

DOI:https://doi.org/10.1103/PhysRevC.50.1535

©1994 American Physical Society

Authors & Affiliations

Suresh Kumar, M. A. Eswaran, E. T. Mirgule, D. R. Chakrabarty, V. M. Datar, N. L. Ragoowansi, U. K. Pal, and H. H. Oza

  • Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400 085, India

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Vol. 50, Iss. 3 — September 1994

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