Nucleon localization and fragment formation in nuclear fission

Zhang, C. L.; Schuetrumpf, B.; Nazarewicz, W.

doi:10.1103/PhysRevC.94.064323

Title: Nucleon localization and fragment formation in nuclear fission

Journal Article · Tue Dec 27 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.94.064323· OSTI ID:1358654

Zhang, C. L. ^[1]; Schuetrumpf, B. ^[1]; Nazarewicz, W. ^[2]

Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Facility for Rare Isotope Beams (NSCL/FRIB)
Michigan State Univ., East Lansing, MI (United States). Facility for Rare Isotope Beams (FRIB), Dept. of Physics and Astronomy; Univ. of Warsaw (Poland). Inst. of Theoretical Physics

An electron localization measure was originally introduced to characterize chemical bond structures in molecules. Recently, a nucleon localization based on Hartree-Fock densities has been introduced to investigate α-cluster structures in light nuclei. Compared to the local nucleonic densities, the nucleon localization function has been shown to be an excellent indicator of shell effects and cluster correlations. In this work, using the spatial nucleon localization measure, we investigated the emergence of fragments in fissioning heavy nuclei using the self-consistent energy density functional method with a quantified energy density functional optimized for fission studies. We studied the particle densities and spatial nucleon localization distributions along the fission pathways of ²⁶⁴Fm, ²³²Th, and ²⁴⁰Pu. We demonstrated that the fission fragments were formed fairly early in the evolution, well before scission. To illustrate the usefulness of the localization measure, we showed how the hyperdeformed state of ²³²Th could be understood in terms of a quasimolecular state made of ¹³²Sn and ¹⁰⁰Zr fragments. Compared to nucleonic distributions, the nucleon localization function more effectively quantifies nucleonic clustering: its characteristic oscillating pattern, traced back to shell effects, is a clear fingerprint of cluster/fragment configurations. This is of particular interest for studies of fragment formation and fragment identification in fissioning nuclei.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: NA0002847; SC0013365; SC0008511

OSTI ID:: 1358654

Alternate ID(s):: OSTI ID: 1338107

Journal Information:: Physical Review C, Vol. 94, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 47 works

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