Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Neutrino astronomy IV

T 92.7: Talk

Thursday, March 18, 2021, 17:30–17:45, Tq

Prospects for the Detection of Solar Neutrinos in DARWIN via Elastic Electron Scattering — •Shayne Reichard for the DARWIN collaboration — Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT) — Physik-Institut, University of Zurich

The DARWIN observatory, a proposed experiment that would utilize tens of tonnes of liquid xenon to directly detect dark matter, will additionally exhibit sensitivity to solar neutrinos via elastic electron scattering. DARWIN will have the potential to measure the fluxes of five solar neutrino components: pp, ⁷Be, ¹³N, ¹⁵O and pep. A high-statistics observation of pp neutrinos would allow us to infer the values of the weak mixing angle, sin²θ_w, and the electron-type neutrino survival probability, P_e, in the electron recoil energy region from a few keV up to 200 keV. Such measurements would be the first at these low energies. An observation of pp and ⁷Be neutrinos would constrain the neutrino-inferred solar luminosity down to 0.2%. A combination of all flux measurements would distinguish between the high (GS98) and low metallicity (AGS09) solar models with 2.1-2.5σ significance, independent of external measurements from other experiments or a measurement of ⁸B neutrinos through coherent elastic neutrino-nucleus scattering in DARWIN. Finally, the neutrino capture process on ¹³¹Xe may be observable with a target depleted of ¹³⁶Xe. We present results of detailed calculations based on the anticipated properties of the DARWIN detector.