Nuclear Experiment·nucl-ex

Tue·Jul 7, 2026Tuesday·July 7, 2026

8 papers—1 primary·7 cross-listed

01
Measurement of isolated prompt photon production in $p$ + $p$ collisions at $s = 200$ GeV with the sPHENIX detector
sPHENIX Collaboration: M. I. Abdulhamid🇺🇸 · U. Acharya🇺🇸 · G. Adawi🇺🇸 · I. Ahmed🇺🇸 · C. A. Aidala🇺🇸 · Y. Akiba🇯🇵 · M. Alfred🇺🇸 · A. Alsayegh🇺🇸 · D. M. Anderson🇺🇸 · V. V. Andrieux🇺🇸 · A. Angerami🇺🇸 · N. Applegate🇺🇸 and 208 other authors
The differential cross section of isolated prompt photon production is measured as a function of photon transverse energy ( $E_{T}^{γ}$ ) in proton--proton ( $p$ + $p$ ) collisions at $s = 200$ GeV. The data were recorded in $2024$ with the sPHENIX detector at the Relativistic Heavy Ion Collider. Photons are reconstructed in $∣ η^{γ} ∣ < 0.7$ and $12 < E_{T}^{γ} < 32$ GeV using the electromagnetic calorimeter, and an isolation requirement is imposed using both the electromagnetic and hadronic calorimeters. The measured cross section is compared with the PYTHIA Monte Carlo event generator and perturbative quantum chromodynamics (pQCD) calculations at next-to-leading and next-to-next-to-leading order. The pQCD calculations are consistent with the result within the quoted uncertainties. This measurement provides a test of pQCD calculations for a process with sensitivity to the gluon parton distribution function of the proton and establishes the $p$ + $p$ baseline for forthcoming sPHENIX measurements of isolated prompt photons in heavy-ion collisions.
nucl-exnucl-th1 citation
02
Transverse-spin dependent energy-energy correlators in proton-proton collisions within the dihadron fragmentation framework
Zhong-Bo Kang🇺🇸 · Andreas Metz🇺🇸 · Daniel Pitonyak🇺🇸 · Congyue Zhang🇺🇸
We calculate energy-energy correlations for two hadrons produced inside a jet in transversely polarized proton-proton collisions. We make numerical predictions based on a simple model that utilizes a previous global QCD analysis of dihadron fragmentation and transversity parton distribution functions. The results show remarkable agreement with a very recent STAR measurement. We also find the data at large jet transverse momentum have a slight preference for extractions of transversity that are consistent with lattice QCD computations of the nucleon tensor charges. Overall, this work provides further evidence for the underlying non-perturbative mechanism of near-side energy-energy correlators as well as highlights the potential for these observables to probe transverse-spin effects inside the nucleon.
↳ hep-phhep-exnucl-exnucl-th1 citation
03
CUORE Data Release for ML Applications: Pulse Shape Analysis Dataset
CUORE Collaboration
We present a public dataset from the CUORE (Cryogenic Underground Observatory for Rare Events) experiment, designed to support the development and benchmarking of Artificial Intelligence and Machine Learning (AI/ML) algorithms for cryogenic calorimeter data analysis. CUORE uses TeO $_{2}$ cryogenic calorimeters to measure particle energy depositions as thermal fluctuations. This dataset contains thermal pulses measured during calibration data taking. Each data point is provided as a one-dimensional, time-series array corresponding to a thermal pulse, accompanied by a binary classification label to distinguish between single-pulse events and pile-up events with two or more pulses; pulse normalization parameters and relevant metadata are also included, with all data stored in HDF5 format. This data release enables the testing of supervised learning approaches to pulse shape analysis, pile-up identification, and related tasks in the context of rare-event searches with cryogenic calorimeters.
↳ physics.ins-detnucl-ex0 citations
04
Studying baryon number transport dynamics via hyperon-kaon correlations in $p + Au$ collisions at $s_{_{NN}} = 20$ , $39$ and $62$ GeV
Siyuan Ping🇨🇳 · Xiaozhou Yu🇨🇳 · Long Ma🇨🇳
The observation of positive net hyperon baryon numbers at mid-rapidity in heavy-ion collisions indicates that baryon numbers from incident nucleons can be transported across a large rapidity gap to hyperons where strange quarks of $s - s ˉ$ are pair-produced. Consequently, hyperons and kaons are expected to be correlated, providing a sensitive probe of both baryon number transport mechanism and strange quark pair correlation. Such correlation may be used to test the gluon-junction interaction mechanism where a $Y$ -shaped gluonic field may carry the baryon number and be responsible for the baryon number transport to hyperons over a large rapidity gap. We present hyperon-kaon correlations as a function of their relative rapidity in $p + Au$ collisions at $s_{N N} = 20$ , $39$ , and $62$ GeV using a multiphase transport ( $AMPT$ ) model and Ultra-relativistic Quantum Molecular Dynamics ( $UrQMD$ ) models where hyperon-kaon pairs are originated from fragmentation scheme. We quantify the correlation function using the Wasserstein distance method and systematically investigate the correlation dependence on the beam energy, hyperon emission direction and detector acceptance. Our simulation results provide a baseline without the baryon junction mechanism for future experimental measurements.
↳ hep-phhep-exnucl-exnucl-th0 citations
05
A New High-Intensity Source for Ultracold Neutrons
K. Abe🇯🇵 · S. Ahmed · B. Algohi🇨🇦 · D. Anthony🇨🇦 · L. Barron-Palos🇲🇽 · Y. Bylinsky · M. Bosse🇨🇦 · M.P. Bradley🇨🇦 · A. Brossard🇨🇦 · J. Chak🇨🇦 · R. Chiba🇨🇦 · C. Davis🇨🇦 and 69 other authors
The TRIUMF UltraCold Advanced Neutron (TUCAN) collaboration has completed a new superthermal source for ultracold neutrons (UCNs) at TRIUMF. It uses neutrons from a spallation target driven by TRIUMF's %520-MeV main cyclotron. Heavy water and liquid deuterium serve as neutron moderators, and inelastic scattering inside superfluid $^{4}$ He at around \qty{1.1}{\kelvin} slows the neutrons down to become ultracold. During commissioning runs with the completed source, including the deuterium moderator, up to $1.47 (2) \times 1 0^{7}$ UCNs were detected in the experimental area after irradiating the target and accumulating UCNs in the source for \qty{60}{\second}. Up to \qty{6.75(3)e5} UCN/s were detected during continuous operation, more than at any other source in the world.
↳ physics.ins-detnucl-ex0 citations
06
Quantum interference effects enhanced in $π^{+} p$ femtoscopic correlation functions
Zhi-Wei Liu🇨🇳 · Jun-Xu Lu🇨🇳 · Duo-Lun Ge🇨🇳 · Li-Sheng Geng🇨🇳
We present a comprehensive analysis of the $π^{+} p$ femtoscopic correlation functions measured by the ALICE Collaboration in high-multiplicity $pp$ collisions at $s = 13$ TeV. Using the Koonin-Pratt formula with a Gaussian source and data-driven $π N$ partial-wave amplitudes, we account for the contributions from $π^{+} p$ scattering and $Δ (1232)^{++}$ -decay, thereby successfully reproducing the measured data and their transverse-mass ( $m_{T}$ ) dependence. The scattering contribution yields a peak near the relative momentum $k \approx 140$ MeV/ $c$ , whereas the decay contribution peaks around $k \approx 220$ MeV/ $c$ . The observed correlation peak results from a weighted sum of the two contributions, with $m_{T}$ -dependent relative weights. We find that the 140 MeV/ $c$ peak originates from quantum interference between the incident and scattered waves-a mechanism previously unnoticed in femtoscopic studies. This finding resolves the peak-shift puzzle in $π^{+} p$ correlations and provides a novel perspective for quantum interference effects in femtoscopy.
↳ hep-phhep-exnucl-ex1 citation
07
$S$ matrices of elastic $n$ - $^{16}$ O scattering at low energies in cluster effective field theory
Shung-Ichi Ando🇰🇷
Elastic $n$ - $^{16}$ O scattering at low energies is studied in the framework of cluster effective field theory. An evaluated data set of the total cross section of elastic $n$ - $^{16}$ O scattering at neutron energy, $0 \leq E_{n} \leq 4$ ~MeV, is adopted from Evaluated Nuclear Data File (ENDF/B-VIII.0). We derive an expression for the $S$ matrices of the elastic scattering for seven spin-partial wave channels, $l j = s_{1/2}$ , $p_{1/2}$ , $p_{3/2}$ , $d_{3/2}$ , $d_{5/2}$ , $f_{5/2}$ , $f_{7/2}$ , including one excited state and nineteen resonant states of $^{17}$ O. Thirty-four parameters of the theory are fitted to the ENDF data, and we find that a plotted line, by using the fitted parameters, reproduces the ENDF data well. We discuss the uncertainties that may appear in the present approach from the fitted parameters of the resonant states with widths, larger than $Γ = 90$ ~keV. We also discuss the implications of the fitted values of energies and widths of the resonant states in the estimate of the astrophysical $S$ factor of $^{13}$ C( $α$ , $n$ ) $^{16}$ O reaction at stellar energies.
↳ nucl-thnucl-ex0 citations
08
High-precision ab initio calculations of nuclear binding energies: Tin isotopes from dripline to dripline
Urban Vernik🇩🇪 · Pepijn Demol🇧🇪 · Thomas Duguet🇫🇷 · Alexander Tichai🇩🇪
The location of the neutron drip line in tin isotopes has important consequences for our fundamental understanding of nuclear structure and nuclear forces as well as for astrophysical nucleosynthesis. Performing high-precision ab initio calculations of even-even tin isotopes from $N = 50$ to $N = 126$ based on chiral two- and three-nucleon interactions, the predicted drip-line location is found to be highly sensitive to the employed nuclear interactions and to exhibit tension with recent energy-density-functional predictions. On the neutron-deficient side, results are consistent with extrapolated two-neutron separation energies constrained by recent Penning-trap mass measurements.
↳ nucl-thcond-mat.str-elnucl-ex4 citations

Affiliations

first authorsco-authorsvia INSPIRE