Abstract
The continua excited by inelastic scattering of 26 MeV/Aα- and6Li-particles from28Si have been studied at forward angles by coincident detection ofγ-rays in final nuclei after particle decay. While the coincident γ-ray spectra in6Li-induced reactions show only transitions in massA=24, 27 and 28 nuclei, in theα-induced reactionsγ-transitions in mass 20 to 28 nuclei were observed.
Inelastic6Li-scattering with energy losses between 30 and 80 MeV predominantly leads toγ-transitions in27Si and27Al. We interpret this as due to a dominant direct one-nucleon removal process producing the characteristic “triangular” shapes of the inclusive inelastic6Li spectra.6Li-induced reactions on27Al show a corresponding behaviour. The typical flatα-spectra result from additional truly inelastic processes which lead to highly excited states in the target nuclei and subsequent evaporation of nucleons andα-particles. This is supported by the measuredγ-multiplicities and by means of Hauser-Feshbach calculations which allow to deduce that part of the inelasticα-continuum which decays by particle evaporation.
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Dedicated to Professor Theo Mayer-Kuckuk on the occasion of his 60th birthday
Work supported in part by KfK Karlsruhe
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Nitsche, W., Wagner, G.J., Knöpfle, K.T. et al. Nature of continua in inelastic α- and6Li-scattering at 26 MeV/A. Z. Physik A - Atomic Nuclei 326, 435–446 (1987). https://doi.org/10.1007/BF01289548
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DOI: https://doi.org/10.1007/BF01289548