Microscopic description of the torque acting on fission fragments

Scamps, Guillaume

doi:10.1103/physrevc.106.054614

Microscopic description of the torque acting on fission fragments

Journal Article · Wed Nov 30 00:00:00 EST 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.054614· OSTI ID:2419498

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Univ. of Washington, Seattle, WA (United States); OSTI

When two fragments are created in a fission decay, any torque due to nuclear and Coulomb interaction can change the fragment's angular momentum. This paper explores the character and magnitude of the angular momentum as a function of the initial conditions around the scission point using the time-dependent Hartree-Fock theory. To understand the torque acting on the fragments, the Frozen Hartree-Fock method is also used to determine the collective potential at scission. Two ²⁴⁰Pu fission channels (¹³²Sn + ¹⁰⁸Ru and ¹⁴⁴Ba + ⁹⁶Sr) are studied. Further, these two channels cover different shapes (spherical, quadrupole, and octupole deformation) of the fragments. It is found that the angular momentum generated by the Coulomb interaction after fission is mainly collective, while this is not the case for the angular momentum generated at scission. The competition between rotational modes (bending, wriggling, and twisting) is discussed and shows that the angular momentum is generated mainly perpendicular to the fission axis.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FG02-97ER41014

OSTI ID:: 2419498

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 106; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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