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PreprintCC BY 4.0HAL

Energy-Resolved Spin and Parity Distributions of Fission Fragments

  • Petar Marević
  • Nicolas Schunck
  • Antonio Bjelčić
  • Guillaume Scamps
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Abstract

Fission fragments are born rotating rapidly, but the evolution of this spin with excitation energy and its impact on fission observables remain largely unknown. Combining state-of-the-art microscopic and statistical reaction theory, we simulate the full fission process - from the initial state, through scission, to fragment decay - and report the first microscopic, energy-resolved spin and parity distributions of the fragments produced in 239Pu(n,f). From thermal energy to En = 10 MeV, the spin of individual fragments evolves non-monotonically, tracking their deformation. The parity content, strongly non-statistical at thermal energy, remains correlated with spin throughout this range. For the first time, we quantify the impact of microscopic spin-parity distributions on prompt photon multiplicities, demonstrating the predictive potential of parameter-free microscopic inputs.

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Cite

BibTeXRIS
BibTeX
@misc{marevic2026energyresolved,
  title = {{Energy-Resolved Spin and Parity Distributions of Fission Fragments}},
  author = {Petar Marević and Nicolas Schunck and Antonio Bjelčić and Guillaume Scamps},
  howpublished = {HAL},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.03018},
  eprint = {2610.03018},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05835190v1},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Energy-Resolved Spin and Parity Distributions of Fission Fragments
AU  - Petar Marević
AU  - Nicolas Schunck
AU  - Antonio Bjelčić
AU  - Guillaume Scamps
PY  - 2026
DA  - 2026/10/02
PB  - HAL
DO  - 10.48550/arxiv.2610.03018
UR  - https://hal.science/hal-05835190v1
AB  - Fission fragments are born rotating rapidly, but the evolution of this spin with excitation energy and its impact on fission observables remain largely unknown. Combining state-of-the-art microscopic and statistical reaction theory, we simulate the full fission process - from the initial state, through scission, to fragment decay - and report the first microscopic, energy-resolved spin and parity distributions of the fragments produced in ^239Pu(n,f). From thermal energy to E_n = 10 MeV, the spin of individual fragments evolves non-monotonically, tracking their deformation. The parity content, strongly non-statistical at thermal energy, remains correlated with spin throughout this range. For the first time, we quantify the impact of microscopic spin-parity distributions on prompt photon multiplicities, demonstrating the predictive potential of parameter-free microscopic inputs.
ER  -