Low energy neutrinos in Super-Kamiokande

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Sekiya, Hiroyuki^1

Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, 456 Higashi-mozumi, Gifu, Hida

506-1205, Japan^1

关键词: Electron elastic scattering;    Low energy neutrinos;    Low-energy physics;    Recoil electrons;    Solar activity cycles;    Solar neutrino fluxes;    Supernova neutrinos;    Water Cherenkov detectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/6/062052/pdf
DOI  :  10.1088/1742-6596/718/6/062052

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Super-Kamiokande (SK), a 50 kton water Cherenkov detector, observes8B solar neutrinos via neutrino-electron elastic scattering. The analysis threshold was successfully lowered to 3.5 MeV (recoil electron kinetic energy) in SK-IV. To date SK has observed solar neutrinos for 18 years. An analysis regarding possible correlations between the solar neutrino flux and the 11 year solar activity cycle is shown. With large statistics, SK searches for distortions of the solar neutrino energy spectrum caused by the MSW resonance in the core of the sun. SK also searches for a day/night solar neutrino flux asymmetry induced by the matter in the Earth. The Super-Kamiokande Gd (SK-Gd) project is the upgrade of the SK detector via the addition of water-soluble gadolinium (Gd) salt. This modification will enable it to efficiently identify low energy anti-neutrinos. SK-Gd will pursue low energy physics currently inaccessible to SK due to backgrounds. The most important will be the world's first observation of the diffuse supernova neutrino background. The main R&D program towards SK-Gd is EG ADS: a 200 ton, fully instrumented tank built in a new cavern in the Kamioka mine.