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Nuclear Theory·nucl-th

Wednesday·July 3, 2024

10 papers—5 primary·5 cross-listed

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  1. 01

    [Submitted on 2 Jul 2024]

    A sign of three-nucleon short-range correlation from an analysis of nuclear mass and short-range correlation probability

    Na-Na Ma · Rong Wang

    Three-nucleon short-range correlation ( SRC) represents a rare and intriguing part of the nuclear dynamics at short distance, beyond the two-nucleon short-range correlation ( SRC). To search its existence is a hot topic in the ongoing and future high-energy nuclear experiments and the developments of nuclear theory. In this study, we found a positive sign of SRC in nuclei, by analyzing the correlation between the per-nucleon nuclear mass and the probability of a nucleon in SRC state, with the current experimental measurements of H, He, He, Be, C, Al, Fe, Cu, Au and Pb from SLAC, CLAS, and JLab Hall C collaborations. The effective masses of the nucleons in SRC and SRC are also extracted from the analysis, which provide some references for the nuclear medium effect study. The probability of SRC is much smaller than that of SRC, thus requiring high-luminosity experiments to confirm its existence.

    Comments:
    7 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2407.01882 [pdf]
    EPJA(2025)·1 citation
  2. 02

    [Submitted on 2 Jul 2024]

    Benchmarking NN three-body forces and first predictions for A=3-5 hypernuclei

    Hoai Le🇩🇪 · Johann Haidenbauer🇩🇪 · Hiroyuki Kamada🇯🇵 · Michio Kohno🇯🇵 · Ulf-G. Meißner🇩🇪 · Kazuya Miyagawa🇯🇵 · Andreas Nogga🇩🇪

    Explicit expressions for the leading chiral hyperon-nucleon-nucleon three-body forces have been derived by Petschauer et al [Phys. Rev. C93.014001 (2016)]. An important prerequisite for including these three-body forces in few- and many-body calculations is the accuracy and efficiency of their partial-wave decomposition. A careful benchmark of the {\Lambda}NN potential matrix elements, computed using two robust and efficient partial-wave decomposition methods, is presented. In addition, results of a first quantitative assessment for the contributions of NN forces to the separation energies in A=3-5 hypernuclei are reported.

    Comments:
    10 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2407.02064 [pdf]
    EPJA(2025)·14 citations
  3. 03

    [Submitted on 2 Jul 2024]

    Estimating Inverse Scattering Potentials for n-p System Using Variational Monte Carlo & Neural Networks

    Anil Khachi · Gabor Balassa

    The Riccati-type nonlinear differential equation, also known as the Variable Phase Approach or Phase Function Method, is used to construct local inverse potentials for the \( ^3S_1 \) and \( ^1S_0 \) states of the deuteron. The Morse potential has been optimized by adjusting parameters using the Variational Monte Carlo (VMC) and Multilayer Perceptron (MLP) type Neural Networks (NN). The inverse potentials obtained from VMC and NN show almost identical parameters. In VMC, all three parameters of the Morse potential are varied to obtain the phase shifts, while in NN, the 3D-parameter optimization problem is converted to a 1D-parameter optimization problem, thus reducing optimization parameters, time, and computational cost. Recently, the GRANADA group published a comprehensive partial wave analysis of scattering data, which includes 6713 \( np \) phase shift data points from 1950 to 2013. Using the final experimental data points from GRANADA, we obtained the parameters for the Morse potential by minimizing the mean square error (MSE) as the cost function. The MSE using VMC (NN) is found to be 0.65 (2.5) for the \( ^1S_0 \) state and 0.16 (0.22) for the \( ^3S_1 \) state. Various quantum functions, such as phase \( \delta(r) \), amplitude \( A(r) \), and wave function \( u(r) \), are described up to 5 fm with energies \( E_{\ell ab} = [1-350 \text{ MeV}] \).

    Comments:
    18 pages, 1 table, 8 figures, 26 references
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2407.02137 [pdf]
    0 citations
  4. 04

    [Submitted on 2 Jul 2024]

    Vortex Rings in Event-by-Event Relativistic Heavy-Ion Collisions

    David Dobrigkeit Chinellato🇧🇷 · Michael Annan Lisa🇺🇸 · Willian Matioli Serenone🇧🇷 · Chun Shen🇺🇸 · Jun Takahashi🇧🇷 · Giorgio Torrieri🇧🇷

    We present event-by-event simulations for central asymmetric light+heavy and Au+Au collisions to investigate the formation and evolution of vortex-ring structures in the longitudinal flow velocity profile. The production-plane polarization of hyperons, defined w.r.t. the momentum and the beam, can track the "vortex-ring" feature in the event, a characteristic vortical structure generated by longitudinal flow gradients. We make comprehensive model predictions for the rapidity-dependent vortex-ring observables for different collision system sizes at and 72 GeV. Our predictions at the latter energy can be explored in the future LHCb fixed-target experiment at the Large Hadron Collider.

    Comments:
    10 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2407.02212 [pdf]
    PRC(2024)·7 citations
  5. 05

    [Submitted on 2 Jul 2024]

    Calibrating the medium effects of light clusters in heavy-ion collisions

    Tiago Custódio🇵🇹 · Alex Rebillard-Soulié🇫🇷 · Rémi Bougault🇫🇷 · Diego Gruyer🇫🇷 · Francesca Gulminelli🇫🇷 · Tuhin Malik🇵🇹 · Helena Pais🇵🇹 · Constança Providência🇵🇹

    We propose a Bayesian inference estimation of in-medium modification of the cluster self-energies from light nuclei multiplicities measured in selected samples of central XeSn collisions with the INDRA apparatus. The data are interpreted with a relativistic quasi-particle cluster approach in the mean-field approximation without any prior assumption on the thermal parameters of the model. An excellent reproduction is obtained for H and He isotope multiplicities, and compatible posterior distributions are found for the unknown thermal parameters. We conclude that the cluster--meson coupling is temperature dependent, becoming weaker when the temperature increases, in agreement with microscopic quantum statistical calculations. This implies a faster decrease of the light cluster abundances with temperature than previously estimated.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2407.02307 [pdf]
    PRL(2025)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE