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×y resulted in 37 observed events above 0.5 keV, with (26.4 +1.4 −1.3 ) 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 +3.6 −2.3 ) × 10 6 cm −2 s −1 is consistent with results from dedicated solar neutrino experiments. The measured neutrino flux-weighted CEνNS cross-section on Xe of (1.1 +0.8 −0.5 ) × 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.

The COHERENT experiment is well poised to test sub-GeV dark matter models using detectors sensitive to coherent elastic neutrino-nucleus scattering (CEvNS) in the π þ decay-at-rest (π-DAR) neutrino beam produced by the Spallation Neutron Source. We show a planned 750-kg single-phase liquid argon scintillation detector would place leading limits on scalar light dark matter models for dark matter particles produced through vector and leptophobic portals in the absence of other effects beyond the standard model. The characteristic timing profile of a π-DAR beam allows a unique opportunity for constraining systematic

No abstract

A time-domain non-linear potential-flow model has been developed in order to predict the large-amplitude motions of the SEAREV device in a prescribed or arbitrary sea state. The floating body three-dimensional, undergoing six degree-of-freedom motions. The fluid is considered homogeneous, incompressible, inviscid and with an irrotational flow. Surface tension is not taken into account and the depth is considered infinite. The incident wave field is given by a higher-order spectral method. This spectral method permits the simulation of very steep wave field.

No abstract