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Evidence of the spectator role of unpaired nucleons of the target nucleus in (p, α) reactions

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

In this paper the spectra ofα particles emitted in (p, α) reactions induced by ∼24 MeV protons on adjacent target nuclei, onemagic, with a magic neutron or proton shell and the othernear magic, with one more nucleon outside the shell, are measured and compared.

The nuclei investigated are90, 91Zr,122Sn,123Sb,142, 143, 144Nd,208Pb and209Bi. The weak population of low energy levels of the residual nucleus from thenear magic target nucleus and the excitation of homologous states in the residual nuclei from neighbouringmagic andnear magic target nuclei convincingly prove that in most of the cases the unpaired nucleon outside the magic shell acts as a spectator in the process.

The implications of these experimental findings are discussed.

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Authors and Affiliations

  1. Istituto di Fisica dell'Università di Milano, Milano

    E. Gadioli, E. Gadioli Erba, R. Gaggini, P. Guazzoni, P. Michelato, A. Moroni & L. Zetta

  2. Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Milano, Italia

    E. Gadioli, E. Gadioli Erba, R. Gaggini, P. Guazzoni, P. Michelato, A. Moroni & L. Zetta

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  1. E. Gadioli
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  2. E. Gadioli Erba
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  3. R. Gaggini
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  4. P. Guazzoni
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  5. P. Michelato
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  6. A. Moroni
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  7. L. Zetta
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Gadioli, E., Gadioli Erba, E., Gaggini, R. et al. Evidence of the spectator role of unpaired nucleons of the target nucleus in (p, α) reactions. Z Physik A 310, 43–54 (1983). https://doi.org/10.1007/BF01433609

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  • DOI: https://doi.org/10.1007/BF01433609

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