PaperPanorama

Nuclear Experiment·nucl-ex

Mon·Sep 28, 2026

4 papers—0 primary·4 cross-listed

All4Primary0Cross-lists4
  1. 01

    Measurement of charged-particle production in TeV proton-oxygen collisions as a probe of cosmic-ray air showers with the ATLAS detector

    ATLAS Collaboration

    This Letter presents a measurement of prompt charged-particle production in proton-oxygen interactions at TeV center-of-mass energy with the ATLAS detector, corresponding to 634 b of integrated luminosity. A total of 246 million selected events have at least one track with transverse momentum MeV and pseudorapidity . The measured fiducial proton-oxygen cross section is and the extrapolated inelastic proton-air cross section is . Measurements of charged-particle multiplicity, , and distributions are an order-of-magnitude more precise than differences between hadronic-interaction models. These results enable improved modeling of cosmic-ray air showers, which is important for astroparticle physics.

    ↳ hep-exnucl-exPRL(2026)·4 citations
  2. 02

    A new type of skin thickness in high-spin isomers to constrain equation of state of spin-polarized nuclear matter

    Toi Tachibana · Kouichi Hagino · Kenichi Yoshida · Qiang Zhao

    We explore experimental probes for constraining the equation of state (EOS) of spin-polarized nuclear matter, where spins of nucleons are aligned along a particular direction. For this purpose, we calculate the isomeric state of the \ce{^{52}Fe} nucleus with the relativistic point-coupling model. We argue that the spin skin thickness of this high-spin state, that is, the difference between the radius of the spin-up density and that of the spin-down density, strongly correlates with the spin slope parameter of the EOS. This is in analogy to the well known linear correlation between the slope parameter of the symmetry energy and the neutron skin thickness of finite nuclei. We show that this correlation is retained even when one considers the difference of the radii between the and the ground states, even though the correlation is much weaker than in the case of the difference between the spin-up and the spin-down radii. We also discuss the mean-square charge radii of the state. We find that by taking the square of the radii the dependence on the spin slope parameter becomes much stronger, and thus it can serve as a good probe of the spin slope parameter given a high resolution of laser-spectroscopy experiments.

    ↳ nucl-thnucl-ex
  3. 03

    Strangeness Production at GlueX

    Hao Li

    The GlueX experiment at Jefferson Lab is well suited for exclusive studies of strangeness production, combining a linearly polarized photon beam at GeV with a large-acceptance detector that reconstructs weakly decaying hyperons. We outline a research program built on three aspects: (i) spectroscopy of strange mesons, where many excited states remain unestablished and crypto-exotic strange hybrids must be identified from combined spectrum and decay information, anchored by the as a standard candle; (ii) spin dynamics, where the first precise measurements of the complete spin-density matrix elements in the photoproduced system beyond the Schilling formalism constrain the -channel strange production mechanism; and (iii) hadronization, probed through the newly published , , and photoproduction cross sections and emerging spin-correlation measurements. We place these efforts in the context of the broader GlueX strangeness program and give an outlook toward the high-statistics GlueX-II era.

    ↳ hep-exnucl-ex
  4. 04

    Transition Radiation Detector Upgrade for the GlueX-III Charmonium Program

    Lauren Kasper · Alexander Austregesilo · Cody Dickover · Sean Dobbs · Sergey Furletov · Yulia Furletova · Ilya Larin · Lubomir Pentchev · Saheli Rakshit · Nizar Septian · Simon Taylor · Julia Velkovska

    The GlueX-III experiment at Jefferson Lab, planned to run in 2027-2029, will enhance the laboratory's capability to explore charmonium production near threshold and related aspects of QCD in the non-perturbative regime. A central upgrade for GlueX-III is a large-scale triple-GEM Transition Radiation Detector (TRD) optimized for electron identification and pion suppression in the hadron-rich environment of fixed-target photoproduction. This document describes the motivation for and efforts related to such an upgrade, including the design, construction, and performance of a 720x528mm triple-GEM-TRD prototype that was tested in the existing GlueX-II experimental acceptance during the 2025 run. Results validate the prototype's integration, timing performance, and electron identification capability. Its projected impact in the GlueX-III setting is discussed, with background reduction in a candidate sample demonstrated. The development and use of a modern TRD technology in a high-background environment at Jefferson Lab may inform detector design choices as a future upgrade path for the EIC.

    ↳ physics.ins-detnucl-ex

Affiliations

first authorsco-authorsvia INSPIRE