PaperPanorama

Nuclear Experiment·nucl-ex

Mon·Jun 29, 2026

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    Multiplicity dependence of the size of the common hadron emission source in pp collisions at the LHC

    ALICE Collaboration

    Femtoscopic analysis can shed light on hadron production in pp collisions. In this paper, proton-proton correlations measured in collisions at TeV recorded with the ALICE detector at the LHC are presented. The analysis is based on the minimum bias dataset collected in 2022 following the upgrade of the ALICE detector and corresponds to an integrated luminosity of pb. The increased integrated luminosity allows us, for the first time, to simultaneously measure the multiplicity and transverse-mass () dependence of the size of the hadron-emitting source. Precise knowledge of the femtoscopic source size in pp collisions is a crucial ingredient for using femtoscopy to study the residual strong interaction among stable and unstable hadrons at the LHC. In this light, the source radius was determined from the measured correlation functions by assuming several state-of-the-art models of the nucleonnucleon interactions. The consistency among the extracted radii demonstrates the robustness of the measurement with respect to interaction model assumptions. A comparison to femtoscopic radii measured in PbPb collisions at TeV reveals a markedly different multiplicity dependence in similar intervals, providing new insight into the system-size dependence of particle emission dynamics.

    nucl-exhep-ex2 citations
  2. 02

    Oblate-prolate shape mixing and E0 transition in 28Si

    Yasutaka Taniguchi · Masaaki Kimura🇯🇵

    Background: oblate-prolate shape coexistence in Si has been discussed for decades, but the degree of shape mixing between these configurations remains poorly constrained. Purpose: We constrain the oblate-prolate mixing amplitudes in Si using available experimental information and discuss the inter-band E0 transition strength. Methods: Oblate and prolate and configurations are obtained by antisymmetrized molecular dynamics combined with the generator coordinate method. Using these configurations as the basis states, we constrain the mixing amplitudes by simultaneously reproducing the measured charge radius, the quadrupole moment of the state, and the in-band and inter-band values. The strength of the density-dependent term in the Gogny interaction is also varied within a reasonable range. Results: In the ground state, the oblate component is dominant, and the prolate component in the ground state is limited to less than about . For the state, the allowed prolate component is smaller than that in the ground state. The present analysis does not tightly constrain the corresponding E0 transition strength, but an upper limit of is obtained. Conclusions: The low-lying states of Si may exhibit substantial oblate-prolate mixing. A measurement of the inter-band E0 transition strength would provide a quantitative determination of the mixing amplitude.

    ↳ nucl-thnucl-ex1 citation
  3. 03

    Universal EOS-Radius Inverse Mappings Govern Precision-Dependent Inference of the Neutron Star Equation of State

    Bao-An Li🇺🇸

    Bayesian inference of the neutron star (NS) equation of state (EOS) generally assumes that improved observations primarily reduce posterior uncertainties while leaving inferred EOS parameters unchanged. Using mock measurements of the radius of a canonical NS with identical central values but varying observational precisions, we show that the inferred posterior means of EOS parameters can shift systematically as the measurement uncertainty changes. We demonstrate that this behavior originates from previously unidentified nearly universal inverse mappings between the NS radius and empirical EOS parameters. Across a broad range of observational precisions, posterior samples collapse onto nearly unique functions. These mappings are largely independent of observational precision and define a low-dimensional EOS manifold underlying Bayesian inference. We show that the precision dependence of inferred EOS parameters arises from nonlinear filtering of the posterior radius distribution through these mappings. In the narrow-distribution limit this effect reduces to a Jensen-type correction proportional to the local curvature of the inverse mapping, while for presently realistic uncertainties the full nonlinear-filtering relation accurately reproduces the posterior means. Our results reveal a geometric origin of precision-dependent inference in NS EOS studies and provide a new framework for connecting astrophysical observations directly to microscopic nuclear many-body theories.

    ↳ nucl-thastro-ph.HEhep-phhep-th+12 citations

Affiliations

first authorsco-authorsvia INSPIRE