PaperPanorama

Nuclear Experiment·nucl-ex

Mon·Aug 24, 2026

2 papers—2 primary·0 cross-listed

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  1. 01

    Multi-Differential DVCS Cross Section Measurement on the Proton in the Valence Region with CLAS12

    S. Lee🇺🇸 · T.B. Hayward🇺🇸 · L. Elouadrhiri🇺🇸 · R.G. Milner🇺🇸 · P. Achenbach🇺🇸 · J. S. Alvarado🇫🇷 · M.J. Amaryan🇺🇸 · W.R. Armstrong🇺🇸 · H. Avakian🇺🇸 · N.A. Baltzell🇺🇸 · M. Bashkanov🇬🇧 · M. Battaglieri🇮🇹 and 129 other authors

    We report the measurement of the four-fold differential cross section of deeply virtual Compton scattering (DVCS) on the proton using a longitudinally polarized 10.6 GeV CEBAF electron beam incident on a liquid-hydrogen target with the CLAS12 detector. The analysis provides 1312 data points, expanding the measured phase space in the valence quark region, 0.06 < < 0.58, 1.00 < < 5.76 GeV, and 0.11 < < 1.00 GeV. DVCS cross section measurements directly constrain the real part of the DVCS amplitude through its interference with the Bethe-Heitler process, making them essential inputs to global extractions of the Compton Form Factors (CFFs), particularly the dominant CFF . These data improve sensitivity to these observables and can contribute to future determinations of the proton's internal mechanical structure.

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  2. 02

    Efficient production of Th via neutron capture in VUV-transparent crystals

    Zhong-yi Chen🇨🇳 · Hao-yang Lan · Di Wu🇨🇳 · Mei-zhi Wang · Ze Chen🇨🇳 · Li-pan Qin · Mei-qi Sun · Yu-peng Chen🇨🇳 · Yan Tian · Jin Yan · Yan Wang🇨🇳 · Xun-jie Ma and 5 other authors

    The low-lying isomeric state of Th, owing to its unique nuclear energy structure, has been widely regarded as one of the most promising candidates for the development of a nuclear clock. However, the limited availability of suitable Th sources with sufficiently high activity remains a major challenge for experimental investigations of the Th isomer. We propose a neutron-capture-based approach for the in-situ production of Th by doping Ra into crystal hosts, where Th is generated through neutron-capture reactions followed by a sequence of radioactive decay processes. We systematically investigate the background contributions associated with the three doped crystal hosts, namely CaF, SrF, and LiF, and evaluate their impact on the detection and identification of Th. Under a neutron flux of and a Ra doping concentration of , the proposed method is capable of producing on the order of Th and Th nuclei within only 1 s of irradiation, with a signal-to-noise ratios as high as . In addition, the influences of detector wavelength resolution and post-irradiation measurement time on the detectability of the Th signal are systematically analyzed, and the corresponding optimal measurement conditions are identified. Furthermore, the spatial distribution of neutron-produced Th within the crystal is investigated, providing practical guidance for optimizing crystal geometry and illumination configuration in future continuous-wave VUV absorption spectroscopy experiments. These results suggest that the proposed scheme provides a promising alternative pathway for the production and detection of Th, which may facilitate future studies toward the realization of nuclear-clock-based technologies.

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Affiliations

first authorsco-authorsvia INSPIRE