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Nuclear Theory·nucl-th

Friday·November 5, 2021

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    Three-dimensional Skyrme Hartree-Fock-Bogoliubov solver in coordinate-space representation

    Mengzhi Chen · Tong Li · Bastian Schuetrumpf · Paul-Gerhard Reinhard · Witold Nazarewicz

    The coordinate-space representation of the Hartree-Fock-Bogoliubov theory is the method of choice to study weakly bound nuclei whose properties are affected by the quasiparticle continuum space. To describe such systems, we developed a three-dimensional Skyrme-Hartree-Fock-Bogoliubov solver HFBFFT based on the existing, highly optimized and parallelized Skyrme-Hartree-Fock code Sky3D. The code does not impose any self-consistent spatial symmetries such as mirror inversions or parity. The underlying equations are solved in HFBFFT directly in the canonical basis using the fast Fourier transform. To remedy the problems with pairing collapse, we implemented the soft energy cutoff and pairing annealing. The convergence of HFB solutions was improved by a sub-iteration method. The Hermiticity violation of differential operators brought by Fourier-transform-based differentiation has also been solved. The accuracy and performance of HFBFFT were tested by benchmarking it against other HFB codes, both spherical and deformed, for a set of nuclei, both well-bound and weakly-bound.

    nucl-thComput.Phys.Commun.(2022)·14 citations
  2. 02

    Stochastic features of dissipative large-amplitude dynamics and nuclear fission

    V.M.Kolomietz · S.V.Radionov

    Within a density matrix approach for nuclear many--body system, it is derived non--Markovian Langevin equations of motion for nuclear collective parameters, where memory effects are defined by memory time. The developed stochastic approach is applied to study both the nuclear descent from fission barrier to a scission point and thermal diffusive overcoming of the barrier. The present paper is partly a review of our results obtained earlier and contains new results on the non--Markovian generalization of Kramers' theory of escape rate and on time features of the collective dynamics in the presence of periodic external modulation.

    nucl-th0 citations
  3. 03

    Analysis of the fusion mechanism in synthesis superheavy element 119 via Cr+Am reaction

    B.M. Kayumov (1,4) · O.K. Ganiev (1,2,5) · A.K. Nasirov (1,3) · G.A. Yuldasheva (1) ((1) Institute of Nuclear Physics, Uzbekistan Academy of Science, Tashkent, Uzbekistan, (2) College of Engineering, Akfa University, Tashkent, Uzbekistan, (3) Joint Institute for Nuclear Research, Dubna, Russia, (4) New Uzbekistan University, Tashkent, Uzbekistan, (5) Faculty of Physics, National University of Uzbekistan, Tashkent)

    The combined dinuclear system (DNS) and statistical model implanted in KEWPIE2 have been used to study the prospects for the synthesis of a superheavy element (SHE) with in the Cr+Am fusion reaction. The method of calculation has been verified by description of the evaporation residue cross sections measured for the Ca+Am reaction. The calculated results of the partial and total cross sections for the complete fusion, quasifission, fast fission and evaporation residues formation for both reactions are discussed.

    nucl-thPRC(2022)·34 citations
  4. 04

    Constraining the nucleon size with relativistic nuclear collisions

    Giuliano Giacalone🇩🇪 · Björn Schenke🇺🇸 · Chun Shen🇺🇸

    The notion of the "size" of nucleons and their constituents plays a pivotal role in the current paradigm of the formation and the fluctuations of the quark-gluon plasma produced in high-energy nuclear collision experiments. We report on state-of-the-art hydrodynamic results showing that the correlation between anisotropic flow, , and the mean transverse momentum of hadrons, , possesses a unique sensitivity to the nucleon size in off-central heavy-ion collisions. We argue that existing experimental measurements of this observable support a picture where the relevant length scale characterizing the colliding nucleons is of order 0.5 fm or smaller, and we discuss the broad implications of this finding for future global Bayesian analyses aimed at extracting initial-state and medium properties from nucleus-nucleus collision data, including - correlations. Determinations of the nucleon size in heavy-ion collisions will provide a solid independent constraint on the initial state of small system collisions, and will establish a deep connection between collective flow data in nucleus-nucleus experiments and data on deep inelastic scattering on protons and nuclei.

    nucl-thhep-exhep-phnucl-exPRL(2022)·43 citations

Affiliations

first authorsco-authorsvia INSPIRE