Fri·Nov 29, 2024Friday·November 29, 2024

1. 01*

   New Limits on Coherent Neutrino Nucleus Elastic Scattering Cross Section at the Kuo-Sheng Reactor Neutrino Laboratory

   TEXONO Collaboration: S. Karmakar🇹🇼 · M.K. Singh🇹🇼 · V. Sharma🇹🇼 · H.T. Wong🇹🇼 · Greeshma C.🇹🇼 · H.B. Li🇹🇼 · L. Singh🇮🇳 · M. Agartioglu🇹🇼 · J.H. Chen🇨🇳 · C.I. Chiang🇹🇼 · M. Deniz🇹🇼 · H.C. Hsu🇹🇼 and 16 other authors

   Neutrino nucleus elastic scattering ({\nu}Ael) with reactor neutrinos is an interaction under full quantum-mechanical coherence. It has not yet been experimentally observed. We present new results on the studies of {\nu}Ael cross section with an electro-cooled p-type point-contact germanium detector at the Kuo-Sheng Reactor Neutrino laboratory. A total of (242)357 kg-days of Reactor ON(OFF) data at a detector threshold of 200 eVee in electron equivalent unit are analyzed. The Lindhard model parametrized by a single variable k which characterizes the quenching function was used. Limits at 90% confidence level are derived on the ratio {\rho} relative to standard model (SM) cross section of {\rho}<4.7 at the predicted value of k=0.162, while k<0.285 at the SM-value of {\rho}=1. Prospects on future positive measurements are discussed.

   nucl-exhep-exhep-phPRL(2025)·37 citations
2. 02*

   Towards a new generation of solid total-energy detectors for neutron-capture time-of-flight experiments with intense neutron beams

   J. Balibrea-Correa🇪🇸 · V. Babiano-Suarez🇪🇸 · J. Lerendegui-Marco🇪🇸 · C. Domingo-Pardo🇪🇸 · I. Ladarescu🇪🇸 · A. Tarifeño-Saldivia🇪🇸 · G. de la Fuente-Rosales🇪🇸 · B. Gameiro🇪🇸 · N. Zaitseva🇺🇸 · V. Alcayne🇪🇸 · D. Cano-Ott🇪🇸 · E. González-Romero🇪🇸 and 125 other authors

   Challenging neutron-capture cross-section measurements of small cross sections and samples with a very limited number of atoms require high-flux time-of-flight facilities. In turn, such facilities need innovative detection setups that are fast, have low sensitivity to neutrons, can quickly recover from the so-called $\gamma$-flash, and offer the highest possible detection sensitivity. In this paper, we present several steps toward such advanced systems. Specifically, we describe the performance of a high-sensitivity experimental setup at CERN n\_TOF EAR2. It consists of nine sTED detector modules in a compact cylindrical configuration, two conventional used large-volume C${}_6$D${}_6$ detectors, and one LaCl${}_3$(Ce) detector. The performance of these detection systems is compared using ${}^{93}$Nb($n$,$\gamma$) data. We also developed a detailed \textsc{Geant4} Monte Carlo model of the experimental EAR2 setup, which allows for a better understanding of the detector features, including their efficiency determination. This Monte Carlo model has been used for further optimization, thus leading to a new conceptual design of a $\gamma$ detector array, STAR, based on a deuterated-stilbene crystal array. Finally, the suitability of deuterated-stilbene crystals for the future STAR array is investigaged experimentally utilizing a small stilbene-d12 prototype. The results suggest a similar or superior performance of STAR with respect to other setups based on liquid-scintillators, and allow for additional features such as neutron-gamma discrimination and a higher level of customization capability.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2025)·5 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.