First Indication of Solar <math display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">B</mi></mrow><mprescripts/><none/><mrow><mn>8</mn></mrow></mmultiscripts></mrow></math> Neutrinos via Coherent Elastic Neutrino-Nucleus Scattering with XENONnT - INSPIRE

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First Indication of Solar ${}^{8}B$ Neutrinos via Coherent Elastic Neutrino-Nucleus Scattering with XENONnT

XENON

Collaboration

Aug 5, 2024

10 pages

Published in:

Phys.Rev.Lett. 133 (2024) 19, 191002

Published: Nov 7, 2024

e-Print:

2408.02877 [nucl-ex]

DOI:

10.1103/PhysRevLett.133.191002 (publication)

Experiments:

XENONnT

View in:

reference search62 citations

Citations per year

Abstract: (APS)

We present the first measurement of nuclear recoils from solar

{}^{8}B

neutrinos via coherent elastic neutrino-nucleus scattering with the XENONnT dark matter experiment. The central detector of XENONnT is a low-background, two-phase time projection chamber with a 5.9 t sensitive liquid xenon target. A blind analysis with an exposure of

3.51 t \times yr

resulted in 37 observed events above 0.5 keV, with (

{26.4}_{- 1.3}^{+ 1.4}

) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of

2.73 σ

. The measured

{}^{8}B

solar neutrino flux of

({4.7}_{- 2.3}^{+ 3.6}) \times 10^{6} {cm}^{- 2} s^{- 1}

is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted

CE ν NS

cross section on Xe of

({1.1}_{- 0.5}^{+ 0.8}) \times 10^{- 39} {cm}^{2}

is consistent with the Standard Model prediction. This is the first direct measurement of nuclear recoils from solar neutrinos with a dark matter detector.

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