Thu·Dec 28, 2023Thursday·December 28, 2023

1. 01*

   Modification of Quark-Gluon Distributions in Nuclei by Correlated Nucleon Pairs

   nCTEQ Collaboration: A.W. Denniston🇮🇱 · T. Jezo🇩🇪 · A. Kusina🇵🇱 · N. Derakhshanian🇵🇱 · P. Duwentaster🇫🇮 · O. Hen🇺🇸 · C. Keppel🇺🇸 · M. Klasen🇩🇪 · K. Kovarik🇩🇪 · J.G. Morfin🇺🇸 · K.F. Muzakka🇩🇪 · F.I. Olness🇺🇸 and 5 other authors

   We extend the QCD Parton Model analysis using a factorized nuclear structure model incorporating individual nucleons and pairs of correlated nucleons. Our analysis of high-energy data from lepton Deep-Inelastic Scattering, Drell-Yan and W/Z production simultaneously extracts the universal effective distribution of quarks and gluons inside correlated nucleon pairs, and their nucleus-specific fractions. Such successful extraction of these universal distributions marks a significant advance in our understanding of nuclear structure properties connecting nucleon- and parton-level quantities.

   ↳ hep-phnucl-exPRL(2024)·38 citations
2. 02*

   The Energy Response of LaBr3(Ce), LaBr3(Ce,Sr) and NaI(Tl) Crystals for GECAM

   Pei-Yi Feng (1 and 2) · Xi-Lei Sun (3)🇨🇳 · Zheng-Hua An (1) · Yong Deng (4) · Cheng-Er Wang (5) · Huang Jiang (3) · Jun-Jie Li (4)🇨🇳 · Da-Li Zhang (1)🇨🇳 · Xin-Qiao Li (1) · Shao-Lin Xiong (1)🇨🇳 · Chao Zheng (1 and 2) · Ke Gong (1)🇨🇳 and 10 other authors

   The GECAM series of satellites utilize LaBr3(Ce), LaBr3(Ce,Sr), and NaI(Tl) crystals as sensitive materials for gamma-ray detectors (GRDs). To investigate the non-linearity in the detection of low-energy gamma rays and address errors in the E-C relationship calibration, comprehensive tests and comparative studies of the non-linearity of these three crystals were conducted using Compton electrons, radioactive sources, and mono-energetic X-rays. The non-linearity test results for Compton electrons and X-rays displayed substantial differences, with all three crystals showing higher non-linearity for X-rays and gamma-rays than for Compton electrons. Despite LaBr3(Ce) and LaBr3(Ce,Sr) crystals having higher absolute light yields, they exhibited a noticeable non-linear decrease in light yield, especially at energies below 400 keV. The NaI(Tl) crystal demonstrated excess light output in the 6~200 keV range, reaching a maximum excess of 9.2% at 30 keV in X-ray testing and up to 15.5% at 14 keV during Compton electron testing, indicating a significant advantage in the detection of low-energy gamma rays. Furthermore, this paper explores the underlying causes of the observed non-linearity in these crystals. This study not only elucidates the detector responses of GECAM, but also marks the inaugural comprehensive investigation into the non-linearity of domestically produced lanthanum bromide and sodium iodide crystals.

   ↳ physics.ins-detastro-ph.IMhep-exnucl-exNucl.Sci.Tech.(2024)·6 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.