Fission dynamics of Pu240 from saddle to scission and beyond

Bulgac, Aurel; Jin, Shi; Roche, Kenneth J.; Schunck, Nicolas; Stetcu, Ionel

doi:10.1103/PhysRevC.100.034615

Title: Fission dynamics of ${}^{240}{Pu}$ from saddle to scission and beyond

Journal Article · 19 September 2019 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.100.034615 · OSTI ID:1570633

^[1]; Jin, Shi ^[1]; Roche, Kenneth J. ^[2]; Schunck, Nicolas ^[3];

^[4]

Univ. of Washington, Seattle, WA (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Calculations are presented for the time evolution of ²⁴⁰Pu from the proximity of the outer saddle point until the fission fragments are well separated, using the time-dependent density functional theory extended to superfluid systems. We have tested three families of nuclear energy density functionals and found that all functionals exhibit a similar dynamics: The collective motion is highly dissipative and with little trace of inertial dynamics, due to the one-body dissipation mechanism alone. This finding justifies the validity of using the overdamped collective motion approach and to some extent the main assumptions in statistical models of fission. This conclusion is robust with respect to the nuclear energy density functional used. The configurations and interactions left out of the present theory framework only increase the role of the dissipative couplings. An unexpected finding is varying the pairing strength within a quite large range has only minor effects on the dynamics. Furthermore, we find notable differences in the excitation energy sharing between the fission fragments in the cases of spontaneous and induced fission. With increasing initial excitation energy of the fissioning nucleus, more excitation energy is deposited in the heavy fragment, in agreement with experimental data on average neutron multiplicities.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; FG02-97ER41014; AC05-00OR22725; AC02-05CH11231; AC52-07NA27344; NA0003841

OSTI ID:: 1570633

Alternate ID(s):: OSTI ID: 1562742; OSTI ID: 1579618

Report Number(s):: LA-UR-18-23917; LLNL-JRNL-753306; PRVCAN; TRN: US2100106

Journal Information:: Physical Review C, Vol. 100, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 61 works

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