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Nuclear Theory·nucl-th

Tuesday·March 19, 2024

12 papers—6 primary·6 cross-listed

All12Primary6Cross-lists6
  1. 01

    [Submitted on 15 Mar 2024]

    Simulations of stochastic fluid dynamics near a critical point in the phase diagram

    Chandrodoy Chattopadhyay🇺🇸 · Josh Ott🇺🇸 · Thomas Schaefer🇺🇸 · Vladimir V. Skokov🇺🇸

    We present simulations of stochastic fluid dynamics in the vicinity of a critical endpoint belonging to the universality class of the Ising model. This study is motivated by the challenge of modeling the dynamics of critical fluctuations near a conjectured critical endpoint in the phase diagram of Quantum Chromodynamics (QCD). We focus on the interaction of shear modes with a conserved scalar density, which is known as model H. We show that the observed dynamical scaling behavior depends on the correlation length and the shear viscosity of the fluid. As the correlation length is increased or the viscosity is decreased we observe a cross-over from the dynamical exponent of critical diffusion, , to the expected scaling exponent of model H, . We use our method to investigate time-dependent correlation function of non-Gaussian moments of the order parameter. We find that the relaxation time depends in non-trivial manner on the power .

    Comments:
    5 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Fluid Dynamics (physics.flu-dyn)
    arXiv:
    2403.10608 [pdf]
    PRL(2024)·29 citations
  2. 02

    [Submitted on 17 Mar 2024]

    Systematic shell-model study of structure and isomeric states in Bi isotopes

    Sakshi Shukla · Praveen C. Srivastava · Deepak Patel

    In this work, we have performed systematic shell-model calculations for Bi isotopes with 204-213 using KHH7B and KHM3Y effective interactions. We have reported yrast and non-yrast shell-model states corresponding to the available experimental data. From the comparison with the experimental data, we could assign spin and parity of several unconfirmed states. We have also calculated electromagnetic properties and compared them with the available experimental data and predicted where experimental data are not available. This study also includes a detailed discussion of multiple isomeric states based on computed shell-model configurations and their respective half-lives.

    Comments:
    Journal of Physics G: Nuclear and Particle Physics (2024)
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2403.11174 [pdf]
    J.Phys.G(2024)·4 citations
  3. 03

    [Submitted on 17 Mar 2024]

    Probing multi-particle bunching from intermittency analysis in relativistic heavy-ion collisions

    Valeria Zelina Reyna Ortiz🇵🇱 · Maciej Rybczynski🇵🇱 · Zbigniew Wlodarczyk🇵🇱

    It has been demonstrated that factorial moments analysis in dependence from the size of phase-space cells (when the latter is decreased but is still considerably large), exhibits sensitivity to particle bunching within a system situated in the two-dimensional cell. Based on recent findings concerning fluctuations in charge particle density observed in central Au + Au collisions at various energies ranging from = 7.7 to 200 GeV at RHIC/STAR, it is proposed that analyzing factorial moments in relativistic heavy-ion collisions could serve as a method to investigate density fluctuations linked to correlation phenomena. Our understanding of particle production mechanisms may be enriched by using factorial moments analysis to gain new information contained in them that was previously unavailable.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2403.11294 [pdf]
    NPA(2025)·1 citation
  4. 04

    [Submitted on 18 Mar 2024]

    Characteristics of the fission fragments in the three-body model of binary fission

    V. Yu. Denisov

    The evaluated nuclide yields, fragment mass and charge distributions, and averaged total kinetic energy of fission fragments for the neutron-induced fission of 30 actinide nuclei are well described in the new model, which considers the fissioning scission system consisting of two heavy fragments and an alpha-particle between them. The alpha-particle has its origin in the neck nucleons. The yield of fission fragments in the model is linked to the number of states over the barrier of the saddle point, which is between the contacting and well-separated fission fragments. The alpha-particle is fused with the nearest heavy fragment after passing the saddle point, therefore, two final fragments appear during fission. The quadrupole deformations of heavy fragments are taken into account in the model. The fragment yields depend on the heights of corresponding saddle points and the values of the equilibrium quadrupole deformation of fragments.

    Comments:
    8 pages, 5 figures, 1 table, Proc. of The 16th Varenna Conference on Nuclear Reaction Mechanisms (NRM2023), June 11-16, 2023
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2403.11628 [pdf]
    EPJ Web Conf.(2024)·1 citation
  5. 05

    [Submitted on 18 Mar 2024]

    Variational calculations of symmetric nuclear matter and pure neutron matter with the tensor-optimized Fermi Sphere (TOFS) method: many-body effects and short-range correlation

    Taiichi Yamada

    The equations of state for symmetric nuclear matter and pure neutron matter are investigated with the tensor-optimized Fermi Sphere method (TOFS) up to the density ~fm. This method is based on a linked-cluster expansion theorem, and the energy per particle of nuclear matter () is calculated variationally with respect to the correlated nuclear matter wave function. We can study the density dependence of the many-body terms arising from the operator products, which contribute to . In order to clarify the relation between the many-body effects and short-range correlation, we take the spin-isospin dependent central {\it NN} interaction with a few GeV repulsion in the inner region. The EOS obtained by the TOFS method is reasonably reproduced, compared with other \textit{ab initio} many-body methods. We found that the many-body terms from the 2-body to 6-body ones) give sizable effects on at higher density, and they play an important role in nuclear matter.

    Comments:
    13 pages, 4 figures, to be published in EJPA (2024). arXiv admin note: text overlap with arXiv:1808.08120
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2403.11717 [pdf]
    EPJA(2024)·1 citation
  6. 06

    [Submitted on 18 Mar 2024]

    Effects of strangeness on the chiral pseudocritical line

    Mahammad Sabir Ali🇮🇳 · Deeptak Biswas🇮🇳 · Amaresh Jaiswal🇮🇳 · Hiranmaya Mishra🇮🇳

    Within a 2+1 flavor Nambu\textendash Jona-Lasinio model, we calculate the curvature coefficients and check them against available lattice QCD estimations. With the observation that the flavor mixing due to the `t Hooft determinant term significantly affects the , we explore the effect of on the crossover lines. With the novel determination of negative at large , we advocate the importance of studying the same in lattice QCD.

    Comments:
    6 pages, 3 figures, Matched with the published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
    arXiv:
    2403.11965 [pdf]
    PRD(2024)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE