PaperPanorama

Nuclear Experiment·nucl-ex

Thu·Jun 18, 2026

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    First Measurement of the Escape Cross Section in the Reaction

    Fumiya Oura🇯🇵 · Yudai Ichikawa🇯🇵 · Junko Yamagata-Sekihara🇯🇵 · Jung Keun Ahn🇰🇷 · Sung Wook Choi🇰🇷 · Manami Fujita🇯🇵 · Takeshi Harada🇯🇵 · Shoichi Hasegawa🇯🇵 · Shuhei Hayakawa🇯🇵 · Kenneth Hicks🇺🇸 · Satoru Hirenzaki🇯🇵 · Sang Hoon Hwang🇰🇷 and 23 other authors

    We investigated the -nucleus interaction through the simultaneous measurement of the inclusive and exclusive -escape reactions at GeV/ at J-PARC. The present measurement explicitly focuses on the escape process for the first time, successfully accomplishing a direct experimental determination of the imaginary part of the optical potential. The differential cross section for the -escape reaction was determined to be . A simultaneous likelihood fit yielded real and imaginary potential strengths of and at the nuclear center, respectively. The derived is significantly stronger than that predicted by theoretical models based on one-nucleon processes, suggesting possible contribution of multi-nucleon involving processes.

    nucl-exnucl-th0 citations
  2. 02

    The electromagnetic decay of No and the stability of neutron deficient Rf isotopes

    A. Lopez-Martens🇫🇷 · K. Hauschild🇫🇷 · R. Chakma🇺🇸 · O. Dorvaux🇫🇷 · B. Gall🇫🇷 · K. Kessaci🇫🇷 · M.L. Chelnokov🇷🇺 · V.I. Chepigin🇷🇺 · A.V. Isaev🇷🇺 · I.N. Izosimov🇷🇺 · D.E. Katrasev🇷🇺 · A.A. Kuznetsova🇷🇺 and 7 other authors

    The electromagnetic decay of the 40 s isomer of No has been investigated using the \textsc{Geant4} toolkit for the simulations of the interaction of particles through matter. It is concluded that the decay does not follow the pattern established in the lighter isotones, where the isomer decays directly to members of the ground state rotational band. An alternative scenario is proposed. The implications on the location of the isotopic border for neutron deficient Rf isotopes are discussed.

    nucl-exnucl-thEPJA(2026)·1 citation
  3. 03

    Vision AI Agent for Continuous Material Monitoring of LEGEND-1000 LoFi Reentrant Tube

    Sonata Simonaitis-Boyd🇺🇸 · Soonhong Lee · Lauren N. O'Brien · Brandon T. Turner · Ralph Massarczyk🇺🇸 · Steven R. Elliott🇺🇸 · Aobo Li · Alexander F. Leder🇺🇸

    We report on a vision AI agent pipeline for non-contact material strain and property extraction from video data, demonstrated on video taken during hydrostatic testing of four OFHC copper cylinders conducted as part of the LEGEND-1000 hardware validation campaign. Traditional strain gauge measurements proved unreliable, motivating a fully-automated agentic alternative. The agent was built on the LangChain framework with Claude Haiku 4.5 as its central reasoning engine, integrating a specialized suite of computer vision tools: FFmpeg for video preprocessing and rotation correction via Hough Line Transform, the Segment Anything Model 2 (SAM2) for spatiotemporal segmentation with automated memory-informed dynamic chunking, and a hybrid EasyOCR and LLM-based timestamp validation pipeline. Three specialized sub-agents were developed to process the video data and obtain cylinder diameters and timestamps while autonomously handling obstacles such as corrupted frames and memory limits. From the diameter profiles synchronized to pressure data, hoop stress--strain curves were reconstructed and yield strengths were calculated using the 0.2\% offset, 0.5\% EUL, and Johnson-Cook methods across two independent tests. Cross-validation against a non-agentic pipeline confirmed agreement for the diameter extraction at the 5 pixel level. The material properties and testing results were further compared to Ansys mechanical simulations performed as part of the LEGEND-1000 reentrant tube design campaign. This work showcases the power of agentic pipelines to extract materials data from video alone.

    ↳ physics.ins-detnucl-exphysics.app-ph0 citations
  4. 04

    Diffuse scattering of neutrons in a wave resonator

    E.D. Kolupaev · V.D. Zhaketov · Yu.V. Nikitenko

    In fundamental experiments with neutrons, the neutron flux and the neutron storage time in the measuring setup are of primary importance. These quantities can be increased by using a storage device for neutrons generated by a pulsed source. In a storage device with material walls, both parameters are determined by the probabilities of neutron absorption and diffuse scattering upon reflection from the storage walls, as well as by the neutron decay probability. This work considers a neutron measurement method and presents the results of an experimental determination of the probability of diffuse neutron scattering in a wave resonator.

    ↳ physics.ins-detcond-mat.mtrl-scinucl-ex0 citations
  5. 05

    Self-Calibration of the Neutrino-Argon Cross Section with Solar Neutrinos

    Rasmi Hajjar🇺🇸 · Obada Nairat🇺🇸 · John F. Beacom🇺🇸

    The success of DUNE's MeV physics program depends upon high-precision knowledge of the charged-current (CC) cross section. While there are indirect constraints at the 10% level for the nuclear transitions that constitute this cross section, the only direct measurement in the MeV range has an uncertainty of 50%. We show, surprisingly, that the cross section can be precisely measured using the solar-neutrino data themselves. This is possible because of independent knowledge of the B flux and survival probability, plus the distinctive angular distributions of the Fermi and Gamow-Teller transitions that comprise the cross section. We propose new methods to extract the transition strengths, considering both intuitive groupings and a Principal Component Analysis. Under pessimistic assumptions about detection, but taking detector uncertainties to be controlled, we demonstrate that a precision of 2% on the cross section can be achieved in the 9-15 MeV energy range. These results will be an important foundation for studying the cross section up to several tens of MeV, where the complexity increases significantly due to nuclear breakup channels but where reducing uncertainties is critical for supernova and atmospheric neutrino studies.

    ↳ hep-phhep-exnucl-exnucl-th0 citations
  6. 06

    Track and energy reconstruction algorithms for a time projection chamber with orthogonal fields

    Martin Vít Vavřík🇨🇿 · Babar Ali🇨🇿 · Hugo Natal da Luz🇨🇿 · Olivier Rousselle🇫🇷 · Tomáš Sýkora🇨🇿

    In this work, we describe the development of track- and energy-reconstruc-tion algorithms for atypical Time Projection Chambers (TPCs) that will be used at the Institute of Experimental and Applied Physics, Czech Technical University in Prague, to search for the anomalous internal pair creation reported by the ATOMKI group. These chambers operate with an inhomogeneous toroidal magnetic field oriented orthogonally to the electric field; we therefore refer to them as Orthogonal-Field TPCs (OFTPCs). Although this configuration distorts the drift of ionization electrons and complicates the resulting electron and positron trajectories, it also offers several practical advantages. We present the most effective of several tested approaches, which employs a simulated ionization-electron drift map for track reconstruction and a Runge--Kutta-based fit for energy reconstruction. Using simulations, we demonstrate that -- under idealized conditions, namely an ideal charge readout with no amplification and no noise and with known initial track positions and directions -- it is possible to achieve a fitted Gaussian width (sigma) better than 1\% in relative energy for both electrons and positrons, after applying corrections for systematic effects that depend on the track parameters.

    ↳ physics.ins-detnucl-ex0 citations

Affiliations

first authorsco-authorsvia INSPIRE