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PreprintCC BY 4.0arXiv

Deciphering Entangled Fission at Finite Excitations via Thermal Subspace Projection

  • J. W. Chen
  • S. C. Li
  • Y. Qiang
  • J. C. Pei
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Abstract

The sharing of particles and energy between entangled fission fragments is known to contribute considerably to final observable distributions. This work unravels this sharing mechanism at finite excitations, which exhibits an intriguing quantum-thermal interplay relevant to long-standing open questions in induced fission. We formulate a thermal double particle-number projection onto spatial subspaces, using the Balian-Brezin representation and Grassmann integrals, to derive the projected partition function and observables. Based on finite-temperature dynamical fission calculations of 240Pu, the formalism explains the puzzling energy dependence of odd-even staggering in charge yields and of sawtooth neutron multiplicities. The present framework also provides a general projection tool for probing entangled thermal many-body systems.

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Cite

BibTeXRIS
BibTeX
@misc{chen2026deciphering,
  title = {{Deciphering Entangled Fission at Finite Excitations via Thermal Subspace Projection}},
  author = {J. W. Chen and S. C. Li and Y. Qiang and J. C. Pei},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.28044},
  eprint = {2610.28044},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.28044},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Deciphering Entangled Fission at Finite Excitations via Thermal Subspace Projection
AU  - J. W. Chen
AU  - S. C. Li
AU  - Y. Qiang
AU  - J. C. Pei
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2610.28044
UR  - https://arxiv.org/abs/2610.28044
AB  - The sharing of particles and energy between entangled fission fragments is known to contribute considerably to final observable distributions. This work unravels this sharing mechanism at finite excitations, which exhibits an intriguing quantum-thermal interplay relevant to long-standing open questions in induced fission. We formulate a thermal double particle-number projection onto spatial subspaces, using the Balian-Brezin representation and Grassmann integrals, to derive the projected partition function and observables. Based on finite-temperature dynamical fission calculations of 240Pu, the formalism explains the puzzling energy dependence of odd-even staggering in charge yields and of sawtooth neutron multiplicities. The present framework also provides a general projection tool for probing entangled thermal many-body systems.
ER  -