Elsevier

Nuclear Physics A

Volume 474, Issue 1, 16 November 1987, Pages 253-284
Nuclear Physics A

High excitation inelastic scattering induced by intermediate energy 40Ar BEAMS

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Abstract

The inelastic channels of the 40Ar + 40Ca, 90Zn, 120Sn and 208Pb reactions at 44 MeV/nucleon and the 40Ar + 90Zr reaction at 33 MeV/nucleon were measured with a time-of-flight spectrometer in the vicinity of the respective grazing angles. In addition to the well known giant quadrupole resonance which is strongly excited, structures at higher excitation energies are observed in all the studied reactions. The existence and regular spacing of these structures are quantitatively confirmed by auto-correlation, cross correlation and Fourier analyses. The contributions to the spectra of transfer-evaporation reactions are calculated by Monte Carlo methods and are shown to reproduce the measured backgrounds. The excitation energies of the bumps are then shown to vary smoothly with target mass A as A13. Interpretations of this phenomenon involving giant resonance and multiphonon excitations and multi-transfer reactions are discussed.

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    Experiment performed at the GANIL national facility, Caen, France.

    1

    Division de Physique Théorique, Laboratoire associé au C.N.R.S.

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