PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·January 31, 2025

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    [Submitted on 29 Jan 2025]

    Coulomb interacting Bose-Einstein correlations in Fourier space

    Aletta Purzsa🇭🇺

    In high-energy heavy-ion physics experiments, a state of matter is created that existed in the early Universe: the quark-gluon plasma. This strongly interacting matter exists in today's experiments only within a range of a few femtometers and for a duration of a few femtometers per speed of light, making its resolution with optical tools impossible. However, there is a method that allows for a closer look into the structure of the quark-gluon plasma: femtoscopy. Initially used in astronomy, femtoscopy is based on the quantum mechanical indistinguishability of identical particles, which causes them to arrive at detectors in a correlated manner. The measurable correlation is related to the spacetime structure of the particle-emitting source, which in heavy-ion physics is the quark-gluon plasma created in collisions. For free particles, a relatively simple relationship exists between the source and the correlation (essentially a Fourier transform). However, this relationship becomes complex when accurately accounting for the repulsive Coulomb interaction between final-state electrically charged particles. Our paper presents a new method that is more precise than previously used ones, yet less computationally demanding, especially for the exotic source function shapes. Mathematically, the method is interesting because it exactly handles many emerging integrals and limits. Practically, it is ready for use in experimental analyses.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2501.17902 [pdf]
    Int.J.Mod.Phys.A(2025)·0 citations
  2. 02

    [Submitted on 30 Jan 2025]

    Branching ratio and information entropy for the p+C reaction in the extended-quantum-molecular-dynamics model

    Lei Shen · Bo-Song Huang · Yu-Gang Ma

    The reactions of p+C with triangular 3 structure and spherical structure with incident energies ranging from 5 to 200 MeV/nucleon are simulated by the in the extended-quantum-molecular-dynamics (EQMD) model together with the GEMINI decay process. This paper presents the incident energy dependence of the branching ratios of fragment production and multiplicity, as well as the associated event information entropy. The results indicate that the triangular 3 C has an extra branching ratio for the quasi-elastic reaction compared to the spherical C. This peculiarity of the branching ratios of the triangular 3 C appears as a small dent in the curves of the event information entropy (both the fragment information entropy and the multiplicity information entropy). Therefore, we propose that the event information entropy could be a probe for detecting the -cluster structure.

    Comments:
    9 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2501.18118 [pdf]
    PRC(2025)·0 citations
  3. 03

    [Submitted on 30 Jan 2025]

    Benchmarking ANN extrapolations of the ground-state energies and radii of Li isotopes

    Marco Knöll · Matthew Lockner · Pieter Maris · Ryan J. McCarty · Robert Roth · James P. Vary · Tobias Wolfgruber

    We present a comparison of model-space extrapolation methods for No-Core Shell Model calculations of ground-state energies and root-mean-square radii in Li isotopes. In particular, we benchmark the latest machine learning tools against widely used exponential and infrared extrapolations for energies and crossing point estimates for radii. Our findings demonstrate that machine learning-based approaches provide reliable predictions with robust statistical uncertainties for both observables even in small model spaces. These predictions are compatible with established exponential and IR extrapolations of energies and mark a notable improvement over conventional radius estimates.

    Comments:
    8 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2501.18252 [pdf]
    PRC(2025)·10 citations
  4. 04

    [Submitted on 30 Jan 2025]

    Hoyle-analog state in N

    Ying-Yu Cao · De-Ye Tao · Bo Zhou · Yu-Gang Ma

    We investigate the cluster structure of using a microscopic four-body cluster model. The calculated spectra agree well with the observed spectra in the low-lying states. We calculate the reduced width amplitudes and spectroscopic factors to investigate the Hoyle-analog state in . Our calculations show that the state at MeV is primarily constituted by and components. This finding is generally consistent with the newly observed state at MeV via the decay channel. Moreover, considering the calculated root-mean-square radius and isoscalar monopole transition strengths, the state emerges as a candidate for the Hoyle-analog state with the cluster structure.

    Comments:
    8 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2501.18303 [pdf]
    PRC(2025)·1 citation
  5. 05

    [Submitted on 30 Jan 2025]

    Description of di-hadron saturation signals within a universal nuclear parton distribution function approach

    Dennis V. Perepelitsa🇺🇸

    Di-hadron and di-jet correlation measurements in proton-nucleus (+A) and electron--nucleus collisions are widely motivated as sensitive probes of novel, non-linear QCD saturation dynamics in hadrons, which are particularly accessible in the dense nuclear environment at low values of Bjorken- (. Current measurements at RHIC and the LHC observe a significant suppression in the per-trigger yield at forward rapidities compared to that in proton-proton collisions, nominally consistent with the "mono-jet" production expected in a saturation scenario. However, the width of the azimuthal correlation remains unmodified, in contradiction to the qualitative expectations from this physics picture. I investigate whether the construction of these observables leaves them sensitive to effects from simple nuclear shadowing as captured by, for example, universal nuclear parton distribution function (nPDF) analyses. I find that modern nPDF sets, informed by recent precision measurements sensitive to the shadowing of low- gluon densities in LHC and other data, can describe all or the majority of the di-hadron/jet suppression effects in +A data at both RHIC and the LHC, while giving a natural explanation for why the azimuthal correlation width is unmodified. Notably, this is achieved via a -differential suppression of overall cross-sections only, without requiring additional physics dynamics which alter the inter-event correlations.

    Comments:
    9 pages, 7 figures, final version as published
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2501.18347 [pdf]
    PRC(2025)·4 citations
  6. 06

    [Submitted on 30 Jan 2025]

    nuclear contact coefficients in the Generalized Contact Formalism

    Eleonora Proietti🇮🇹 · Laura Elisa Marcucci🇮🇹 · Michele Viviani🇮🇹

    This work focuses on extracting nuclear contact coefficients for \( A = 2 \), \( A = 3 \) and \( A = 4 \) nuclei within the Generalized Contact Formalism framework. We investigate the universality of these coefficients across different nuclear systems and interaction models, using both local (in \( r \)-space) and non-local (in \( k \)-space) chiral potentials. The Hyperspherical Harmonics method is employed to calculate the nuclear wave functions from which we obtain the two-body momentum distributions and the two-body density functions, which are essential for extracting the contact coefficients. The adopted method is a rigorous ab-initio approach that can be applied to virtually any potential. We present ratios of contact coefficients across various spin and isospin channels, highlighting their independence from the used nuclear potential. This study extends previous work where only local interaction models were employed. Furthermore, we verify whether the contact coefficient ratio between different nuclei remains consistent even when non-local potentials are considered. Future work will extend this analysis to heavier nuclei, such as \( A = 4 \) and \( A = 6 \) nuclei.

    Comments:
    Proceedings of the 11th International Workshop on Chiral Dynamics (CD2024)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2501.18353 [pdf]
    PoS(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE