Mon·Jan 20, 2025Monday·January 20, 2025

1. 01*

   Neutrinoless double-beta decay search with the LEGEND experiment

   R. Brugnera🇮🇹

   Neutrinoless double-beta decay is a nuclear decay, given as $(A,Z)\to (A,Z+2)+2e^{-}$, with deep consequences for the understanding of our universe. A strong experimental program is underway to search for this transition with many proposed experiments using different technologies. In this article the LEGEND experiment, which uses ${}^{76}$Ge as the isotope of interest, will be described. We will discuss both the first stage, LEGEND-200, which is now taking data at the Laboratori Nazionali del Gran Sasso of INFN in Italy, and the future stage, LEGEND-1000. LEGEND-200 has analyzed a first sample of data (48.3 kg$\cdot$yr) collected from March 2023 to February 2024 with a background index not far away from its goal of 2$\times$10${}^{-4}$ cnts/(keV$\cdot$kg$\cdot$yr). Combining the LEGEND-200 data with those of \textsc{Gerda}\ and \textsc{Majorana Demonstrator}\ one obtains a sensitivity on the half-life of 0$\nu \beta \beta$ decay in ${}^{76}$Ge of $T_{1/2}>$ 2.8 $\times$ 10${}^{26}$ yr at 90\% C.L. and a limit on $T_{1/2}>$ 1.9 $\times$ 10${}^{26}$ yr at 90\% C.L.

   nucl-exPoS(2023)·3 citations
2. 02*

   Solar neutrinos

   Shaomin Chen🇨🇳 · Xun-Jie Xu🇨🇳

   Solar neutrinos, generated abundantly by thermonuclear reactions in the solar interior, offer a unique tool for studying astrophysics and particle physics. The observation of solar neutrinos has led to the discovery of neutrino oscillation, a topic currently under active research, and it has been recognized by two Nobel Prizes. In this pedagogical introduction to solar neutrino physics, we will guide readers through several key questions: How are solar neutrinos produced? How are they detected? What is the solar neutrino problem, and how is it resolved by neutrino oscillation? This article also presents a brief overview of the theory of solar neutrino oscillation, the experimental achievements, new physics relevant to solar neutrinos, and the prospects in this field.

   ↳ hep-phastro-ph.SRhep-exnucl-ex6 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.