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Nuclear Theory·nucl-th

Friday·August 20, 2021

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    [Submitted on 18 Aug 2021]

    Exploring an experimental route of synthesizing superheavy elements beyond Z > 118

    H.C.Manjunatha · Y.S.Vidya · P.S.Damodara Gupta · N.Manjunatha · N.Sowmya · L.Seenappa · T. Nandi

    Role of the Coulomb interaction, mean fissility, mass asymmetry, and charge asymmetry parameters on the synthesis of heavy and superheavy elements has been examined with respect to the deformation parameters of the projectile and target nuclei explicitly in light of the experimental results. The observed facts are classified into four categories and are then used to study several unsuccessful as well as planned reactions to synthesize the new superheavy elements . Concrete inference is too difficult to draw from these results because of excessive deviations in evaporation residue cross-section data. It is found that the arbitrary choice of excitation energy for the experiments studied was the root cause of such large deviations. Such a complex issue can be resolved well by theoretical excitation function studies using the advanced statistical model or the dinuclear system model and choosing the excitation energy corresponding to the energy where the excitation function curve shows the maximum. We believe this method may help us to predict whether the estimated evaporation residue cross-section can be measurable within the experimental limit of the existing facilities for the future reactions planned.

    Comments:
    5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2108.08335 [pdf]
    0 citations
  2. 02

    [Submitted on 19 Aug 2021]

    Dynamics of particle production in Pb--Pb collisions at = 2.76 TeV using PYTHIA8 Angantyr model

    Ravindra Singh🇮🇳 · Yoshini Bailung🇮🇳 · Ankhi Roy🇮🇳

    We study the dynamics of identified, strange, and multi-strange particle production in Pb--Pb collisions at = 2.76 TeV using the recently developed Angantyr model, incorporated within PYTHIA8. We show the interplay between multi-parton interactions (MPI) and color reconnection (CR) on the experimentally measured quantities. The charged-particle multiplicity () and mean transverse momentum () distributions are well explained by PYTHIA8 Angantyr with proper tuning, as presented in this paper. Predictions of spectra, , integrated yields of the identified, strange and multi-strange particles are studied. To provide insight into the collective nature of the produced particles, we look into the ratio of particle yields to pions and kaons. PYTHIA8 Angantyr with CR and MPI mimic signs of collectivity and is possibly one of the suitable candidates to study ultra-relativistic heavy-ion collisions.

    Comments:
    11 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2108.08626 [pdf]
    PRC(2022)·8 citations
  3. 03

    [Submitted on 19 Aug 2021]

    Finite-temperature linear response theory based on relativistic Hartree Bogoliubov model with point-coupling interaction

    A. Ravlić · Y.F. Niu · T. Nikšić · N. Paar · P. Ring

    The finite-temperature linear response theory based on the finite-temperature relativistic Hartree-Bogoliubov (FT-RHB) model is developed in the charge-exchange channel to study the temperature evolution of spin-isospin excitations. Calculations are performed self-consistently with relativistic point-coupling interactions DD-PC1 and DD-PCX. In the charge-exchange channel, the pairing interaction can be split into isovector () and isoscalar () parts. For the isovector component, the same separable form of the Gogny D1S pairing interaction is used both for the ground-state calculation as well as for the residual interaction, while the strength of the isoscalar pairing in the residual interaction is determined by comparison with experimental data on Gamow-Teller resonance (GTR) and Isobaric analog resonance (IAR) centroid energy differences in even-even tin isotopes. The temperature effects are introduced by treating Bogoliubov quasiparticles within a grand-canonical ensemble. Thus, unlike the conventional formulation of the quasiparticle random-phase approximation (QRPA) based on the Bardeen-Cooper-Schrieffer (BCS) basis, our model is formulated within the Hartree-Fock-Bogoliubov (HFB) quasiparticle basis. Implementing a relativistic point-coupling interaction and a separable pairing force allows for the reduction of complicated two-body residual interaction matrix elements, which considerably decreases the dimension of the problem in the coordinate space. The main advantage of this method is to avoid the diagonalization of a large QRPA matrix, especially at finite temperature where the size of configuration space is significantly increased. The implementation of the linear response code is used to study the temperature evolution of IAR, GTR, and spin-dipole resonance (SDR) in even-even tin isotopes in the temperature range MeV.

    Comments:
    20 pages, 9 figures, submitted for publication
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2108.08702 [pdf]
    14 citations

Affiliations

first authorsco-authorsvia INSPIRE