Multidimensional Skyrme-density-functional study of the spontaneous fission of ²³⁸U

Journal Article · Thu Jan 01 00:00:00 EST 2015 · Acta Physica Polonica. Series B

DOI:https://doi.org/10.5506/APhysPolB.46.575· OSTI ID:1233541

Sadhukhan, J. ^[1]; Mazurek, K. ^[2]; Dobaczewski, J. ^[3]; Nazarewicz, W. ^[4]; Sheikh, J. A. ^[1]; Baran, A. ^[5]

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1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Niewodniczanski Institute of Nuclear Physics, Krakow (Poland)
3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland); Univ. of Jyvaskyla (Finland)
4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland)
5. Univ. of Warsaw, Warsaw (Poland)

Here, we determined the spontaneous fission lifetime of ²³⁸U by a minimization of the action integral in a three-dimensional space of collective variables. Apart from the mass-distribution multipole moments Q₂₀ (elongation) and Q₃₀ (left–right asymmetry), we also considered the pairing-fluctuation parameter λ₂ as a collective coordinate. The collective potential was obtained self-consistently using the Skyrme energy density functional SkM*. The inertia tensor was obtained within the nonperturbative cranking approximation to the adiabatic time-dependent Hartree–Fock–Bogoliubov approach. The pairing-fluctuation parameter λ₂ allowed us to control the pairing gap along the fission path, which significantly changed the spontaneous fission lifetime.

• Research Organization: Michigan State Univ., East Lansing, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0002574; AC05-00OR22725
• OSTI ID: 1233541
• Alternate ID(s): OSTI ID: 1338504
• Journal Information: Acta Physica Polonica. Series B, Vol. 46, Issue 3; ISSN 0587-4254
• Publisher: Jagiellonian University
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS