Elsevier

Nuclear Physics A

Volume 282, Issue 2, 23 May 1977, Pages 331-340
Nuclear Physics A

Level structure of 76Br from the 75As(α,3nγ) reaction

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Abstract

Hitherto unknown states of 76Br were excited through the (α, 3nγ) reaction on 75As at Eα = 30 to 55 MeV. Excitation functions, γ-ray angular distributions, γ-γ coincidences and the γ-ray emission time with respect to the beam bursts were determined. Levels above the 1 ground state at energies (in keV) with the following spin-parity assignments are proposed: 141.8, 2; 253.7, 3; 491.8, 4; 584.9, 5; 1016.3, 6. These levels exhibit the energy spacings of a Coriolis-perturbed rotational band and the branching ratios show collective behavior. The comparison of these levels with those of the 52+ ground-state band recently reported in 77Kr show that (a) the Coriolis effects are quite similar and (b) the first two excited levels lie very close in energy in both cases. The possibility that these two facts indicate the validity of the rotation aligned coupling scheme in a doubly odd system is discussed.

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Partially supported with a grant from Alpargatas SAIC.

††

Fellow of the Consejo Nacional de Investigaciones Cientificas y Técnicas.

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