Elsevier

Nuclear Physics A

Volume 373, Issue 1, 4 January 1982, Pages 54-80
Nuclear Physics A

Evidence for spin fluctuations in the deep-inelastic reaction 165Ho + 165Ho at 8.5 MeVamu

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Abstract

Both the magnitude and alignment of the transferred angular momentum in the reaction 165Ho + 165Ho have been measured as a function of Q-value via continuum γ-ray multiplicity and anisotropy techniques. The spin transfer and the continuum γ-ray anisotropy increase throughout the quasi-elastic region. The spin transfer as a function of Q-value saturates at ~ 35ħ/fragment, the anisotropy peaks at a value of ~2 and then decreases to near unity for the largest Q-values. The observed anisotropies are in good agreement with predictions from an equilibrium statistical model in which thermal excitation of angular-momentum-bearing collective modes and neutron evaporation give rise to in-plane components of the angular momentum.

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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 and Nuclear Sciences of the Basic Energy Sciences Program of the US Department of Energy under Contract W-7405-ENG-48.

    ∗∗

    Permanent addresses :Comision Nacional de Energia Atómica, Buenos Aires, Argentina.

    ∗∗∗

    School of Physics, University of Melbourne, Parkville, Victoria 3052, Austria.

    Permanent addresses :Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay, France.

    ††

    Shanghai Institut of Nuclear Research, Shanghai, China.

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