Elsevier

Nuclear Physics A

Volume 443, Issue 3, 7 October 1985, Pages 538-556
Nuclear Physics A

Mass dependence of shell effects at high rotational frequencies

https://doi.org/10.1016/0375-9474(85)90417-8Get rights and content

Abstract

The continuum γ-ray spectra from the reactions 40Ar(170–185 MeV) + 50Ti, 68Zn, 82Se, 100Mo → 90Zr, 108Cd, 122Te, 140Nd, respectively have been studied by using a sum-energy technique. The evolution of the γ-ray spectra with sum energy (spin) suggests the presence of rotational motion at high spins. A method to correct for incomplete feeding was applied to the γ-ray spectra and effective moments of inertia were determined. The results indicate the appearance of a new source of angular momentum at high rotational frequencies. We interpret this as the alignment of high-j orbitals from the next major shell. Simple arguments, as well as cranked-shell-model calculations, are consistent with this picture. Data on band moments of inertia, from EγEγ correlation experiments, are also in accord with our interpretation.

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This work was supported by the Director, Office of Energy Research, Division of Nuclear Physics of the Office of High Energy and Nuclear Physics of the US Department of Energy under contract no. DE-AC03-76SF00098.

Permanent address: Comisión Nacional de Energia Atómica, Buenos Aires, Argentina.

∗∗

Permanent address: Physik Institut, Universität Basel, Switzerland.

∗∗∗

Permanent address: Department of Physics, University Of California, Davis, Ca 95616,USA.

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