First Indication of Solar Neutrinos through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T
Jul 15, 20249 pages
Published in:
- Phys.Rev.Lett. 133 (2024) 19, 191001
- Published: Nov 7, 2024
e-Print:
- 2407.10892 [hep-ex]
DOI:
- 10.1103/PhysRevLett.133.191001 (publication)
Experiments:
View in:
Citations per year
Abstract: (APS)
The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of and background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit neutrino signal of 3.5 (75) events from the paired (US2) data sample, with uncertainty, and the background-only hypothesis is disfavored at significance. This gives a solar neutrino flux of , consistent with the standard solar model prediction. It is also the first indication of solar neutrino “fog” in a dark matter direct detection experiment.Note:
- Accepted by Physical Review Letters
References(56)
Figures(8)
- [1]
- [2]
- [3]
- [4]
- [5]
- [6]
- [7]
- [8]
- [9]
- [10]
- [11]
- [12]
- [13]
- [14]
- [15]
- [16]
- [17]
- [18]
- [19]
- [20]
- [21]
- [22]
- [23]
- [24]
- [25]