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Nuclear Theory·nucl-th

Thursday·January 11, 2024

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    [Submitted on 10 Jan 2024]

    Light Hypernuclei Production in Au+Au Collisions at 3 GeV within Thermodynamic Approach

    M. Kozhevnikova🇷🇺 · Yu. B. Ivanov🇷🇺

    Simulations of the -hyperon and light-hypernuclei production in Au+Au collisions at 3 GeV were performed within updated Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD (Ultra-relativistic Quantum Molecular Dynamics) final State interactions (THESEUS). The light (hyper)nuclei are treated thermodynamically, i.e. they are considered on the equal basis with hadrons. The only additional parameter is related to the late freeze-out that imitates the afterburner stage for the light (hyper)nuclei because the UrQMD is not able to dynamically treat them. The calculation of hypernuclei production is completely similar to that of light nuclei. The hypernuclei results are compared with recent STAR data. It is found that the calculated midrapidity H/ ratio falls within the error bars of the experimental point. It is remarkable that large difference between the and H/ ratios is reproduced without any additional parameters. Rapidity distributions of H/ and He/ ratios are predicted. Midrapidity mean transverse momenta of protons, s and light (hyper)nuclei in central collisions well agree with the data. The calculated directed flow also reasonably well reproduces of the data.

    Comments:
    7 pages, 4 figures, references updated, version published in PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2401.04991 [pdf]
    PRC(2024)·7 citations
  2. 02

    [Submitted on 10 Jan 2024]

    Prediction of two-neutron halos in the isotones Mg and Na

    Jagjit Singh · J. Casal · W. Horiuchi · N. R. Walet · W. Satula

    The ground states of the nuclei Mg and Na are investigated using the hyperspherical formalism. Since they are located at the edge of the "big island of inversion", we concentrate on whether we are likely to find two-neutron Borromean halos in these nuclei. A three-body model with effective - and Mg interactions is built for Mg based on the available data. We also give predictions for the low-lying spectrum of NaNa and two-neutron separation energy of the Na nucleus. Depending on parameter choice, we report an increase in the matter radii in the range - fm relative to those of the core nuclei. The results suggest a two-neutron halo structure in Mg for a subset of parameters, reinforcing the prediction of a Borromean halo nucleus. The calculations indicate that a two-neutron halo is even more likely for Na. As expected, the halo is linked to the disappearance of the shell gap in these nuclei due to the inversion of the and orbitals. We study the total cross section for scattering of these nuclei from a carbon target using a Glauber model and show that these provide a clear signal to assess the halo structure.

    Comments:
    9 pages, 5 figures, 1 table (Final published version)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2401.05160 [pdf]
    PLB(2024)·15 citations
  3. 03

    [Submitted on 10 Jan 2024]

    Deciphering yield modification of hadron-triggered semi-inclusive recoil jets in heavy-ion collisions

    Yang He🇨🇳 · Maowu Nie🇨🇳 · Shanshan Cao🇨🇳 · Rongrong Ma🇺🇸 · Li Yi🇨🇳 · Helen Caines🇺🇸

    In relativistic heavy-ion collisions, a hot and dense state of matter, called the Quark-Gluon Plasma (QGP), is produced. Semi-inclusive jets recoiling from trigger hadrons of high transverse momenta () can serve as an effective probe of the QGP properties, as they are expected to experience jet quenching when traversing the QGP. Recent experimental results on the ratio of recoil jet yields normalized by the trigger counts in heavy-ion collisions to that in + collisions () pose an unexpected challenge in its interpretation. It is observed that rises with the jet and possibly exceeds unity at high , while traditionally it is expected that jet quenching would lead to . To address this challenge, we utilize the Linear Boltzmann Transport (LBT) model to simulate jet transport in the QGP, and study the effect of jet quenching for high- triggers and recoil jets separately on . We find that the quenching of the colored triggers alone is responsible for the rising trend and larger-than-unity value observed experimentally.

    Comments:
    4 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2401.05238 [pdf]
    PLB(2024)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE