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PreprintarXiv licencearXiv

A Two-Component Exciton Model for β-Delayed Neutron Emission

  • Nico Braukman
  • Toshihiko Kawano
  • Robert Grzywacz
  • Zhengyu Xu
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Abstract

A model for β-delayed neutron emission is presented in which the emission of neutrons is allowed to occur before states populated in β- decay have reached equilibrium in the so-called "compound nucleus" picture. The pre-equilibrium neutron spectra are computed using a two-component exciton model, where neutron and proton, particle and hole degrees of freedom are treated independently. This model is implemented in the code BeoH to supplement the existing Hauser-Feshbach model for statistical decay of compound-nucleus states. The effect of a pre-equilibrium component in the total neutron spectrum on the single- and multi-neutron emission probabilities Pxn is investigated for β-decay precursor nuclei in the regions 47≤ Z≤ 49, 83≤ N≤ 86 and 54≤ Z≤ 58, N=125,126. An absolute change in the Pxn values of up to 5-10% is observed in the N=126 region when including pre-equilibrium emission compared to the values predicted by the Hauser-Feshbach model alone.

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Cite

BibTeXRIS
BibTeX
@misc{braukman2026twocomponent,
  title = {{A Two-Component Exciton Model for $β$-Delayed Neutron Emission}},
  author = {Nico Braukman and Toshihiko Kawano and Robert Grzywacz and Zhengyu Xu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.00761},
  eprint = {2610.00761},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.00761},
}
RIS
TY  - UNPB
TI  - A Two-Component Exciton Model for β-Delayed Neutron Emission
AU  - Nico Braukman
AU  - Toshihiko Kawano
AU  - Robert Grzywacz
AU  - Zhengyu Xu
PY  - 2026
DA  - 2026/10/01
PB  - arXiv
DO  - 10.48550/arxiv.2610.00761
UR  - https://arxiv.org/abs/2610.00761
AB  - A model for β-delayed neutron emission is presented in which the emission of neutrons is allowed to occur before states populated in β^- decay have reached equilibrium in the so-called "compound nucleus" picture. The pre-equilibrium neutron spectra are computed using a two-component exciton model, where neutron and proton, particle and hole degrees of freedom are treated independently. This model is implemented in the code BeoH to supplement the existing Hauser-Feshbach model for statistical decay of compound-nucleus states. The effect of a pre-equilibrium component in the total neutron spectrum on the single- and multi-neutron emission probabilities P_xn is investigated for β-decay precursor nuclei in the regions 47≤ Z≤ 49, 83≤ N≤ 86 and 54≤ Z≤ 58, N=125,126. An absolute change in the P_xn values of up to 5-10% is observed in the N=126 region when including pre-equilibrium emission compared to the values predicted by the Hauser-Feshbach model alone.
ER  -