Impact of tensor force on quantum shell effects in quasifission reactions

Li, Liang; Guo, Lu; Godbey, K.; Umar, A. S.

doi:10.1016/j.physletb.2022.137349

Cited by 9 publications

(2 citation statements)

References 71 publications

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“…Recent studies with time-dependent extensions to the meanfield approach that was used here (see [47] for a review) have also shown the importance of shell effects in quasifission reaction [48][49][50]. Combined with shell effect identification methods as used in this work, such time-dependent approaches could be used to investigate the interplay between energy dissipation and shell effects that would impact the energy released in nuclear fission.…”

Section: Discussionmentioning

confidence: 96%

Hartree–Fock–Bogoliubov study of quantum shell effects on the path to fission in $$^{180}$$Hg, $$^{236}$$U and $$^{256}$$Fm

2023

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Quantum shell effects stabilising fission fragments with various shapes have been invoked as a factor determining the distribution of nucleons between the fragments at scission. Shell effects also induce asymmetric shapes in the nucleus on its way to fission well before the final fragments are (pre)formed. These shell effects are studied in fission of $$^{180}$$ 180 Hg, $$^{236}$$ 236 U and $$^{256}$$ 256 Fm with constrained Hartree-Fock-Bogoliubov calculations using the D1S parametrisation of the Gogny interaction. Strutinsky shell energy correction and single-particle energy level density near the Fermi surface are computed. Several neutron and proton shell effects are identified as drivers towards asymmetric fission. Shell effects are also used to identify the preformation of the fragments in the later stage of fission.

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Section: Discussionmentioning

confidence: 96%

Hartree–Fock–Bogoliubov study of quantum shell effects on the path to fission in $$^{180}$$Hg, $$^{236}$$U and $$^{256}$$Fm

2023

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“…The time-dependent Hartree-Fock (TDHF) approach has been extensively used to investigate quasi-fission mechanisms in the past decade [23,28,[53][54][55][56][57][58][59][60][61][62][63]. Three main observables are commonly used to characterise quasifission in such calculations: contact times, TKE and final mass asymmetries of the fragments.…”

Section: B Quasifission Signaturesmentioning

confidence: 99%

Time-dependent Hartree-Fock study of quasifission trajectories in reactions forming $^{294}$Og

McGlynn¹,

Simenel²

2023

Preprint

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Background: Fission modes in superheavy nuclei are expected to be impacted by quantum shell effects. Similar shell effects may be present in quasifission reactions, acting to hinder the mass equilibration process in heavy-ion collisions.Purpose: To investigate quasifission mechanisms in five different reactions forming 294 Og as a compound nucleus and compare quasifission trajectories with predicted fission modes.Methods: The potential energy surface (PES) of 294 Og is calculated using the static Hartree-Fock approach with BCS pairing correlations. Quasifission trajectories for central collisions at various energies are studied with the time-dependent Hartree-Fock theory.Results: The exit channel strongly depends on initial mass asymmetry and orientation, but it only exhibits small dependences in the reaction energy. The 48 Ca+ 246 Cf reaction is affected by the PES topology, leading to either fusion or asymmetric fission. Spherical shell effects associated with the Z = 50 magic gap hinder charge and mass equilibrations in 126 Sn+ 168 Er, resulting in large total kinetic energies and compact scission configurations.Conclusions: Quasifission trajectories can be interpreted in terms of the underlying PES for low excitation energies. Future investigations of quasifission with temperature and angular momentum dependent PES could be considered.

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Possibilities for the synthesis of superheavy element $$Z=121$$ in fusion reactions

Zhang,

Zou

et al. 2024

NUCL SCI TECH

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Impact of tensor force on quantum shell effects in quasifission reactions

Cited by 9 publications

References 71 publications

Hartree–Fock–Bogoliubov study of quantum shell effects on the path to fission in $$^{180}$$Hg, $$^{236}$$U and $$^{256}$$Fm

Hartree–Fock–Bogoliubov study of quantum shell effects on the path to fission in $$^{180}$$Hg, $$^{236}$$U and $$^{256}$$Fm

Time-dependent Hartree-Fock study of quasifission trajectories in reactions forming $^{294}$Og

Possibilities for the synthesis of superheavy element $$Z=121$$ in fusion reactions

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