Elsevier

Nuclear Physics A

Volume 258, Issue 1, 16 February 1976, Pages 43-60
Nuclear Physics A

Nuclear shapes of the transitional nuclei 186, 188, 190, 192Os

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Abstract

Excitation functions at θlab = 130° have been measured for inelastic scattering of 13–24 MeV alpha particles from 186,188,190,192Os. Data have been obtained for 0+, 2+, 4+, 2+' states in 186,188,192Os and for 0+, 2+ states in 190Os. Charge and mass quadrupole deformations, β2c and β2N, were deduced from coupled-channels analysis of the 2+ data. No simple model could provide good fits to the 4+ data over the entire energy range but the very deep interference minima observed establish the charge and mass hexadecapole moments, β4c and β4N, to be negative. The energies of the interference minima for the 4+ states could be reproduced by coupled-channels calculations only if large differences in β4c and β4N were allowed. Data for the (J, K)π = (2, 2)+ states are inconsistent with an asymmetric rotational model.

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    Supported in part by the National Science Foundation.

    ††

    Present address.

    †††

    Present address: Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720.

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