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Nuclear Theory·nucl-th

Tuesday·May 20, 2025

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 01

    Probing Nuclear Geometry through Multi-Particle Azimuthal Correlations and Rapidity-Even Dipolar Flow in O+O Collisions

    Kaiser Shafi🇮🇳 · Sandeep Chatterjee🇮🇳

    We study symmetric and asymmetric cumulants as well as rapidity-even dipolar flow in O+O collisions at ~GeV to explore -clustering phenomena in light nuclei within the viscous relativistic hydrodynamics framework. Signatures of -clustering manifest in the anisotropic flow coefficients and their correlations -- particularly in observables involving elliptic-triangular flow correlations. We show that final-state symmetric and asymmetric cumulants -- especially and -- are sensitive to the initial nuclear geometry. Additionally, we observe a significant difference in rapidity-even dipolar flow, , between -clustered and Woods--Saxon configurations in high-multiplicity events. These findings underscore the pivotal role of nuclear structure in heavy-ion collision dynamics and provide observables for distinguishing nuclear geometries, particularly in ultra-central collisions.

    nucl-thhep-phEPJC(2026)·6 citations
  2. 02

    Symmetry energy expansion and the peak value of the bulk viscosity

    Steven P Harris🇺🇸

    The symmetry energy expansion is a useful way to parametrize the properties of dense matter near nuclear saturation density, and much work has been done to connect physical quantities like the neutron star radius and the core-crust transition density to the symmetry energy parameters. In this work, I connect the weak-interaction-driven bulk viscosity in neutron-proton-electron () matter to the symmetry parameters by calculating the susceptibilities of dense matter in terms of the symmetry energy. I use this result to calculate the resonant-peak value of the bulk viscosity as a function of density, finding that it strongly depends on , as does the minimum bulk-viscous dissipation timescale. Also resulting from this calculation is a formula for finding the conformal points of the zero-temperature equation of state. Finally, I determine for which values of the symmetry parameters the maximum r-mode-stable rotation frequency of an -matter neutron star is smaller than the Kepler frequency, in the high-temperature conditions where bulk viscosity is the dominant dissipation mechanism.

    nucl-thastro-ph.HEgr-qcPRC(2025)·8 citations
  3. 03

    Approach to nuclear cross sections via classical Skyrmion scattering: A proposal

    N.S. Manton🇬🇧

    By analogy with heavy ion collisions, which can be modelled by a classical hydrodynamics, it is proposed that the differential cross section for collisions of smaller nuclei can be calculated from the classical, numerical scattering data for Skyrmions. It is also suggested that the numerical data for the outgoing particles should be classified into bins, as is done in nuclear physics experiments.

    nucl-thhep-th0 citations
  4. 04

    Three-nucleon contact forces in the Jacobi partial-wave basis

    Lin Zuo🇨🇳 · Hao Yang🇨🇳 · Bingwei Long🇨🇳

    We construct the three-nucleon contact potentials in the Jacobi partial-wave basis. The potentials are built in the separable form as the products of the antisymmetrized three-nucleon states in which the nucleons are arbitrarily close to each other. We compile the three-nucleon contact potentials up to . These contact potentials are by construction independent operators under exchanges of any nucleon pairs.

    nucl-thPRC(2026)·2 citations
  5. 05

    Study of the hottest droplet of fluid through correlations and fluctuations of collective variables

    Rupam Samanta

    In this thesis, we focus on the fluctuations and correlations of the collective observables such as the mean transverse momentum per particle () and harmonic flow coefficients () of particles produced in the ultrarelativistic heavy-ion collisions at RHIC and the LHC. Specifically, we show that the fluctuations of harmonic flow can be probed by the factorization-breaking coefficients between flow vectors in different -bins. Experimental difficulty can be reduced by taking one of the flow vectors momentum averaged. Fluctuations cause a decorrelation between the flow vectors, which can be attributed to equal contributions from the flow magnitude and flow angle decorrelation. We study fluctuations of mean transverse momentum per particle () in ultra-central collisions and show that our model can explain the steep fall of its variance observed by the ATLAS collaboration. We also present robust predictions for the skewness and kurtosis, and highlight the role of impact parameter fluctuations in ultracentral collisions. We study the Pearson correlation coefficients between and , which can map the initial state correlations between the shape and size of the fireball. We show that higher order normalized and symmetric cumulants between these observables can be constructed, which put useful additional constraints on the initial state properties. Furthermore, we study the momentum dependent Pearson correlation between and the transverse momentum dependent flow. It shows sensitivity to the Gaussian width of the nucleon at the initial state. Finally, we show that such correlations and fluctuations of collective observables can be used to study nuclear deformation and put robust constraints on their deformation parameters through high energy nuclear collisions.

    nucl-thhep-ph1 citation
  6. 06

    Correlation between U/Th and Pb/Os abundance ratios and its application in nuclear cosmochronology

    Y. Y. Huang🇨🇳 · Q. Q. Cui🇨🇳 · X. H. Wu🇨🇳 · S. Q. Zhang🇨🇳

    The abundance ratios of radioactive elements U/Th and stable elements Pb/Os from the -process are found to have a strong correlation. This correlation is quite robust with respect to astrophysical conditions. The U/Th-Pb/Os correlation is then applied to provide customized initial abundance ratios U/Th from the observed abundance ratios Pb/Os for six -process enhanced metal-poor stars respectively. Ages of these six metal-poor stars are predicted by the U/Th chronometer, which are approximately between and Gyr. Their ages are compatible with the cosmic age of 13.8 billion years predicted from the cosmic microwave background radiation.

    nucl-thastro-ph.SRApJ(2025)·5 citations
  7. 07

    Nucleon-nucleon correlation functions from different interactions in comparison

    Matthias Göbel🇮🇹 · Alejandro Kievsky🇮🇹

    Correlation functions as they can be observed in heavy-ion collisions using the femtoscopy technique are a powerful tool to study the interaction among different baryons or mesons. Specifically, the multi-nucleon correlation functions have been under intense experimental and theoretical investigation in the recent years. Due to the interest of using this observable as an input in the construction of potentials between hadrons we revisit the nucleon-nucleon correlation function and calculate it using different nuclear interactions at high precision. Since the nucleon-nucleon potential is determined to reproduce the two-nucleon scattering data, we would like to critically evaluate the amount of this information captured by the correlation function. We study the dependence of the correlations on the nuclear force giving detailed insights into the calculations, in particular the convergence behavior in the partial waves. The coupling between the different partial-wave channels is taken into account and the relevance of this effect is quantified. To make contact with precedent studies the results based on the Argonne V18 interaction are presented. Then we consider also the Norfolk NV2-IIa and NV2-IIb chiral EFT interactions. The analysis of the differences between the correlations of the various interactions shows that for momenta between 0 and 500 MeV there are variations of up to 5.9 % for the system, of up to 1.8 % for the system, and of 1.4 % for the system.

    nucl-thnucl-exPLB(2025)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE