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Angular distribution calculation based on the exciton model taking account of the influence of the Fermi motion and the Pauli principle

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

An exact closed form solution to the time-integrated master equation of the exciton model is applied to the calculation of the angular distribution for both the preequilibrium and equilibrium decays of the neutron-induced reaction. The distribution probability of two-nucleon collision fromΩ toΩ′ based on the Fermi gas model and the influence of the Fermi motion and the Pauli principle on the shape of the angular distribution are studied in detail. We have concluded that the influence of these effects on the shape of the angular distribution is rather significant for reactions in the energy range of several tens of MeV. As an example to compare with the experiments we have calculated the neutron-induced reaction93Nb(n,n′) atE n =15 MeV. It seems that the most significant improvement of the present approach is the rise of the backward direction of the double differential cross section for the higher energy emitted neutrons.

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Author notes

  1. Zhuo Yizhong

    Present address: Institute of Atomic Energy, Beijing, China

Authors and Affiliations

  1. Institute of Atomic Energy, Beijing, China

    Sun Ziyang, Wang Shunuan & Zhang Jingshang

  2. Max-Planck-Institut für Kernphysik, Heidelberg, Federal Republic of Germany

    Zhuo Yizhong

Authors
  1. Sun Ziyang
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  2. Wang Shunuan
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  3. Zhang Jingshang
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  4. Zhuo Yizhong
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Additional information

We would like to acknowledge the interest of Prof. H.A. Weidenmüller in this work, and express appreciation for his stimulating discussions and reading of the final version of this paper. One of the authors (Z.Y.) is also grateful to the Max-Planck-Institut für Kernphysik for their financial support during his stay in Heidelberg, where the final manuscript was prepared.

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Ziyang, S., Shunuan, W., Jingshang, Z. et al. Angular distribution calculation based on the exciton model taking account of the influence of the Fermi motion and the Pauli principle. Z Physik A 305, 61–68 (1982). https://doi.org/10.1007/BF01415080

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  • DOI: https://doi.org/10.1007/BF01415080

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