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Fission Fragment Intrinsic Spins and Their Correlations.

Aurel Bulgac1, Ibrahim Abdurrahman1, Shi Jin1

  • 1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.

Physical Review Letters
|April 23, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new theoretical framework to analyze fission fragment intrinsic spins and their correlations. It provides the first microscopic calculations for ^{236}U and ^{240}Pu, revealing novel spin distribution features.

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Area of Science:

  • Nuclear Physics
  • Quantum Mechanics
  • Computational Physics

Background:

  • Intrinsic spins and correlations of fission fragments remain poorly understood theoretically and experimentally.
  • Fission fragments possess intrinsic excitation energy and spin, influenced by reaction mechanisms and conservation laws.
  • Understanding these properties is crucial for characterizing fragment deexcitation mechanisms.

Purpose of the Study:

  • To develop a theoretical framework for extracting intrinsic spin distributions and correlations of fission fragments.
  • To apply this framework to induced fission of Uranium-236 and Plutonium-240.
  • To investigate novel qualitative features in spin distributions and provide insights into long-standing debates.

Main Methods:

  • Utilizing the fully microscopic real-time density-functional theory (RT-DFT) formalism.
  • Employing two nuclear energy density functionals for calculations.
  • Extracting intrinsic spin distributions and their correlations from theoretical models.

Main Results:

  • The framework successfully extracts intrinsic spin distributions and correlations for ^{236}U and ^{240}Pu.
  • New qualitative features in fission fragment spin distributions, not previously discussed, were identified.
  • The study provides the first microscopic insights into correlations debated for over six decades.

Conclusions:

  • The developed RT-DFT framework offers a powerful tool for studying fission fragment spins.
  • This work presents the first quantitative theoretical results on intrinsic spin correlations in ^{236}U and ^{240}Pu fission.
  • The findings contribute to resolving long-standing questions in nuclear fission research.