PaperPanorama

Nuclear Experiment·nucl-ex

Fri·Jun 26, 2026

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 01

    Half-Life Measurements of Sn, Sn, Sn, and Sn Produced via Photon Activation of Natural Tin

    O Nusair🇺🇸 · D Devries · M Toto-Gonzalez

    We report independent determinations of the ground-state half-lives of Sn, Sn, and the isomeric states Sn (J) and Sn (J), produced via photon activation of natural tin using a TT-300HE Rhodotron accelerator. The activated samples were monitored over several months using a high-purity germanium (HPGe) detector. Time-dependent -ray spectra were analyzed using Gaussian peak fitting for the \SI{280.49}{keV}, \SI{391.697}{keV}, \SI{158.56}{keV}, and \SI{160.34}{keV} transitions, yielding half-lives of \SI{4.165(25)}{h} for Sn, \SI{116.08(94)}{d} for Sn, \SI{13.95(1)}{d} for Sn, and \SI{39.95(12)}{min} for Sn. Agreement with Nuclear Data Sheets (NDS) recommended values is generally observed for Sn, Sn, and Sn, with deviations consistent within combined uncertainties when quantified using standardized differences (z-scores). In contrast, Sn exhibits a statistically significant deviation from the evaluated value of \SI{13.76(4)}{d}, with a z-score indicating a discrepancy well beyond expected statistical fluctuations. This result suggests a systematic difference warranting further investigation, with potential implications for applications relying on precise decay data, including calibration, dosimetry, and astrophysical modeling.

    nucl-exphysics.ins-det0 citations
  2. 02

    Anomalously long-delayed afterpulses in large-area photomultipliers

    Nikita Ushakov🇷🇺 · Bayarto Lubsandorzhiev🇷🇺 · Arslan Lukanov🇷🇺 · Andrei Sidorenkov🇷🇺 · Dmitrii Voronin🇷🇺

    We report the observation of anomalously long-delayed afterpulses in photomultipliers of the Baksan Large Neutrino Telescope project 10-inch R7081-100, 8-inch R5912-100, 20-inch R12860 photomultipliers produced by Hamamatsu Photonics, and 20-inch N6205 photomultipliers produced by NNVT. The mean delay times relative to the main pulses are approximately s, s, s, and s, respectively. The probability of such afterpulses does not exceed 0.1% per photoelectron, and their amplitudes are strictly confined to the single-photoelectron level, regardless of the amplitude of the main pulse. The delay time of these afterpulses shows no significant dependence on the PMT operating voltage.

    ↳ physics.ins-detastro-ph.IMhep-exnucl-ex0 citations
  3. 03

    Axial-Vector Lattice Benchmarks Reveal a Common Medium Response of Meson Screening in Hot QCD

    Jie Ren🇨🇳 · Chen Chen🇨🇳 · Fei Gao🇨🇳 · Si-xue Qin🇨🇳

    Meson screening masses trace the evolution of hadronic correlations toward quasi-free quark--antiquark screening in hot QCD. Combining lattice QCD (LQCD) benchmarks with a symmetry-preserving Dyson--Schwinger baseline, we identify a flavor-dependent axial-vector quasi-free onset, : an operational high-temperature matching scale at which the axial-vector screening mass has approached the corresponding free-field value after ordinary chiral restoration or parity-partner convergence has set in. On the finite interval , independent light/strange and charm-containing lattice benchmarks are organized by a common medium-response function with one flavor-sector parameter. One axial-vector point fixes this parameter; the remaining axial-vector data test its temperature dependence, and vector screening masses validate it without vector input. A reduced-mass interpolation then yields lattice-testable quasi-free onsets and screening spectra for light-charm and bottom-containing sectors. The resulting onset scales provide common reference points for future lattice and continuum studies of meson dissolution across flavor.

    ↳ hep-phhep-exhep-latnucl-ex+10 citations
  4. 04

    Development and Characterization of Low-Scattering Vanadium Nanoparticle Targets for Short-Range Interaction Searches

    Masayuki Hiromoto · Tatsushi Shima🇯🇵 · Christopher C. Haddock · Katsuya Hirota🇯🇵 · Masaaki Kitaguchi🇯🇵 · Ryota Kondo · Rintaro Nakabe🇯🇵 · Kenji Mishima🇯🇵 · Hirohiko M. Shimizu🇯🇵 · Yuki Yoshikawa · Tamaki Yoshioka🇯🇵

    We developed high-purity vanadium-based nanoparticle targets for neutron scattering experiments aimed at exploring gravity-like short-range new interactions in the submicron regime. Vanadium and V-Ni nanoparticles were fabricated using top-down and bottom-up methods and quantitatively characterized by SEM-EDS, ICP-AES, NDIR and SAXS. Through the performance tests, an RF thermal plasma method was found to be the best from viewpoints of the reproducibility, dispersion of the radius, and contamination of metallic elements. The oxygen incorporation during fabrication was quantified, and its impact on the effective coherent scattering length was evaluated, leading to a minimum average coherent scattering length of , comparable to that of natural vanadium. These results demonstrate that vanadium-based nanoparticle targets with controlled composition and nanostructure can be systematically designed and fabricated to suppress nuclear scattering backgrounds, thereby enabling experimentally viable coherent neutron scattering measurements for short-range interaction searches.

    ↳ physics.ins-detnucl-ex0 citations
  5. 05

    HERETIX: A Hermetic, Enriched, Rare-Event Time Projection Chamber in Xenon

    L. Althueser🇩🇪 · N. Hargittai🇮🇱 · J. Pienaar🇮🇱 · R. Braun🇩🇪 · H. Landsman🇮🇱 · C. Weinheimer🇩🇪 · R. Budnik🇮🇱

    Xenon-based time projection chambers have established themselves as one of the most powerful technologies for rare-event searches. HERETIX is a proposed multi-tonne liquid xenon observatory featuring two nested time projection chambers that enable the simultaneous optimisation of searches for weakly interacting massive particles and neutrinoless double beta decay () of Xe. A hermetically sealed sapphire vessel containing xenon enriched to 90% Xe forms the inner detector, providing an ultra-low-background environment for searches. Monte Carlo studies indicate that material-induced backgrounds can be effectively eliminated, yielding a projected half-life sensitivity of at 90% confidence level after a 10-year exposure, while the surrounding xenon volume, depleted in Xe, preserves the excellent dark matter sensitivity of large liquid xenon detectors. HERETIX therefore offers a unified experimental approach capable of delivering leading sensitivity to two of the most compelling questions in fundamental physics.

    ↳ physics.ins-dethep-exnucl-ex0 citations
  6. 06

    Rapidity-even directed flow splitting of protons and antiprotons as a probe of baryon stopping in relativistic heavy-ion collisions

    Tribhuban Parida🇮🇳 · Sandeep Chatterjee🇮🇳

    We compare the rapidity-even directed flow in Au+Au collisions at Beam Energy Scan (BES) energies for baryons and anti-baryons within a (3+1)-dimensional viscous relativistic hydrodynamics coupled to hadronic transport framework. The double-junction baryon stopping picture motivates a rapidity-even component in the baryon deposition in the initial state. We demonstrate that the split in the of protons and anti-protons is sensitive to the rapidity extension of the baryon deposition that we associate with the double junction baryon stopping. Particularly, we find that the mid-rapidity curvature is a robust discriminator of the initial state baryon rapidity profiles. A simultaneous measurement of and its curvature at mid-rapidity could constrain both the baryon diffusion strength and the baryon stopping profile, providing access to the physics of baryon stopping in relativistic heavy ion collisions.

    ↳ nucl-thhep-phnucl-ex1 citation

Affiliations

first authorsco-authorsvia INSPIRE