Search for Solar 8B Neutrinos in the PandaX-4T Experiment Using Neutrino-Nucleus Coherent Scattering

A search for interactions from solar 8B neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data is reported. The energy threshold of this search is further lowered compared with the previous search for dark matter, with various techniques utilized to suppress the background that emerges from data with the lowered threshold. A blind analysis is performed on the data with an effective exposure of 0.48 tonne year, and no significant excess of events is observed. Among the results obtained using the neutrino-nucleus coherent scattering, our results give the best constraint on the solar 8B neutrino flux. We further provide a more stringent limit on the cross section between dark matter and nucleon in the mass range from 3 to 9 GeV=c2.

Automated summary

A search is conducted for interactions from solar 8B neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data. The energy threshold for this search is lowered compared to previous dark matter searches, and various techniques are employed to suppress background. Analyzing the data with an effective exposure of 0.48 tonne year, no significant excess of events is observed. The study provides the most stringent constraint on the solar 8B neutrino flux and a more stringent limit on the cross section between dark matter and nucleon in the mass range from 3 to 9 GeV/c2.