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Nuclear Theory·nucl-th

Wednesday·October 25, 2023

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    Effects of nuclear structure and quantum interference on diffractive vector meson production in ultra-peripheral nuclear collisions

    Heikki Mäntysaari🇫🇮 · Farid Salazar🇺🇸 · Björn Schenke🇺🇸 · Chun Shen🇺🇸 · Wenbin Zhao🇺🇸

    We study diffractive vector meson production in ultra-peripheral collisions (UPCs) of heavy nuclei, utilizing a theoretical framework based on the Color Glass Condensate (CGC) formalism. We focus on Au+Au, U+U, Ru+Ru, Zr+Zr, and Pb+Pb collisions, examining the transverse momentum dependence of vector meson production cross-sections and asymmetries in the decay product distributions to explore the role of nuclear geometry. The angular modulation is due to the linear polarization of the incoming photons and quantum interference effects. We extract nuclear radii and find them to be consistent with experimental data from the STAR collaboration. The amplitudes of the modulation in the cross-section and the extracted radii depend on the nuclear geometry. This dependence is dominated by the geometry-dependent variation of the minimum impact parameter required for ultra-peripheral collisions.

    nucl-thhep-phnucl-exPRC(2024)·34 citations
  2. 02

    Dynamical and finite-size effects on the criterion of first-order phase transition

    Lijia Jiang🇨🇳 · Fei Gao🇨🇳 · Yu-xin Liu🇨🇳

    To identify first-order phase transitions in the dynamical process similar to the relativistic heavy-ion collisions, we investigate the dynamical behaviors of the first-order phase transition criterion in the Fokker-Planck framework. In the thermodynamic limit, the criterion can be expressed as combinations of cumulants or coefficients of an Ising-like effective potential. Our study reveals that factors such as phase transition scenarios, initial temperature, system volume, relaxation rate, and evolution trajectory have great impacts on the criterion, a larger initial temperature, a smaller volume, a larger relaxation rate, or bending of the trajectory will all lead to a reduction of the first-order phase transition signal, while volume expansion over time preserves signal integrity. Analysis along a hypothetical freezeout line shows that the signal is possibly preserved at relatively large chemical potentials.

    nucl-thhep-phEPJC(2025)·4 citations
  3. 03

    Acceptance effect on the ratio of light nuclei coalescence yields as a probe of nucleon density fluctuations

    Michael X. Zhang · An Gu

    We employ a coalescence model to form deuterons (), tritons () and helium-3 () nuclei from a uniformly distributed volume of protons ({\rm p}) and neutrons ({\rm n}). We study the ratio of light nuclei yields as a function of the neutron density fluctuations. We investigate the effect of finite transverse momentum () acceptance on the ratio, in particular, the "extrapolation factor" () for the ratio as functions of the spectral shape and the magnitude of neutron density fluctuations. It is found that is monotonic in spectra "temperature" parameter and neutron density fluctuation magnitude; variations in the latter are relatively small. We also examine in realistic simulations using kinematic distributions of protons measured in heavy ion collision data. It is found that is smooth and monotonic as a function of beam energy. We conclude that extrapolation from limited ranges would not create, enhance, or reduce a local peak of the ratio in beam energy. Our study provides a necessary benchmark for light nuclei ratios as a probe of nucleon density fluctuations, an important observable in the search for the critical point of nuclear matter.

    nucl-thnucl-exNucl.Sci.Tech.(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE