nucl-ex

Observation of impact parameter dependent modifications of nuclear parton distributions in photonuclear Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV with the ATLAS detector

Using 2018 ATLAS data from ultra-peripheral Pb+Pb collisions at 5.02 TeV, this study provides the first experimental observation that nuclear parton distribution modifications vary with impact parameter, evidenced by a significant difference in $\gamma+A$ jet production cross-sections between collisions with and without forward neutron emission.

Overview of results from NA61/SHINE

This paper provides a subjective summary of recent results from the NA61/SHINE experiment at CERN, highlighting findings of particular importance to other major heavy-ion research programs operating at overlapping or adjacent collision energies.

Probing QCD instantons using jet correlation observables in proton-proton collisions at the LHC

This paper proposes jet correlation observables to unambiguously distinguish instanton-induced processes from perturbative QCD events in proton-proton collisions at the LHC, utilizing constraints derived from 2+1 flavor QCD calculations to guide future searches at the Electron-Ion Collider.

Exploring Particle Production and Thermal-Like Behavior through Quantum Entanglement

Observation of hidden nuclear reactions on fast neutron-irradiated Lu isotopes

This paper presents experimental evidence suggesting that dineutron formation during fast neutron irradiation of lutetium isotopes leads to unexpected reaction pathways, including the fusion of 175Lu with deuterons, which significantly reduces the half-life of 176gLu and implies the existence of novel low-energy nuclear reactions with major implications for nuclear physics and high-energy physics.

Determination of the Muon Lifetime in $^{76}$Se with the MONUMENT experiment

The MONUMENT collaboration determined the muon lifetime in $^{76}$Se with improved accuracy to be (135.1 $\pm$ 0.5) ns, a result that aligns with phenomenological calculations using unquenched axial-vector coupling and serves as a benchmark for neutrinoless double beta decay models.

Backward-angle electroproduction of $η'$ mesons off protons at $W=2.13~\text{GeV}$ and $Q^{2}=0.46~\left(\text{GeV}/c\right)^{2}$

This paper reports the first experimental measurement of backward-angle $η'$ meson electroproduction off protons at $W=2.13~\text{GeV}$ and $Q^{2}=0.46~(\text{GeV}/c)^{2}$, yielding a differential cross section significantly lower than real-photoproduction values and providing new constraints on nucleon resonance couplings within an isobar model framework.

The collectivity of transverse momentum fluctuations

This paper utilizes hydrodynamic modeling to demonstrate that the transverse momentum fluctuation observable $v_0(p_T)$ serves as a robust probe of radial flow and collectivity, revealing that its apparent sensitivity to transport coefficients is largely driven by changes in the mean transverse momentum and can be isolated through appropriate scaling.

Westcott $g$ Factors Extended to Arbitrary Neutron Energy Spectra

This paper presents an updated methodology and open-source software for calculating Westcott $g$ factors using ENDF/B-VIII.1 cross-section data across both Maxwellian and arbitrary non-Maxwellian neutron spectra, specifically addressing the needs of guided thermal and cold-neutron beams at facilities like the Budapest Research Reactor and FRM II.

Proton induced reactions on 118Sn target at energies up to 18 MeV

This study investigates proton-induced reactions on an enriched 118Sn target up to 18 MeV using the stacked-foil activation technique, reporting first-time cross-section measurements for specific channels and revealing discrepancies between experimental data and theoretical models regarding composite-particle emission.