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

Aprile E; Aalbers J; Abe K; Ahmed Maouloud S; Althueser L; Andrieu B; Angelino E; Antón Martin D; Arneodo F; Baudis L; Bazyk M; Bellagamba L; Biondi R; Bismark A; Boese K; Brown A; Bruno G; Budnik R; Cai C; Capelli C; Cardoso JMR; Cimental Chávez AP; Colijn AP; Conrad J; Cuenca-García JJ; D'Andrea V; Daniel Garcia LC; Decowski MP; Deisting A; Di Donato C; Di Gangi P; Diglio S; Eitel K; Elykov A; Ferella AD; Ferrari C; Fischer H; Flehmke T; Flierman M; Fulgione W; Fuselli C; Gaemers P; Gaior R; Galloway M; Gao F; Ghosh S; Giacomobono R; Glade-Beucke R; Grandi L; Grigat J; Guan H; Guida M; Gyorgy P; Hammann R; Higuera A; Hils C; Hoetzsch L; Hood NF; Iacovacci M; Itow Y; Jakob J; Joerg F; Kaminaga Y; Kara M; Kavrigin P; Kazama S; Kobayashi M; Koke D; Kopec A; Kuger F; Landsman H; Lang RF; Levinson L; Li I; Li S; Liang S; Lin Y; Lindemann S; Lindner M; Liu K; Liu M; Loizeau J; Lombardi F; Long J; Lopes JAM; Luce T; Ma Y; Macolino C; Mahlstedt J; Mancuso A; Manenti L; Marignetti F; Marrodán Undagoitia T; Martens K; Masbou J; Masson E; Mastroianni S; Melchiorre A; Merz J; Messina M; Michael A; Miuchi K; Molinario A; Moriyama S; Mor\aa{} K; Mosbacher Y; Murra M; Müller J; Ni K; Oberlack U; Paetsch B; Pan Y; Pellegrini Q; Peres R; Peters C; Pienaar J; Pierre M; Plante G; Pollmann TR; Principe L; Qi J; Qin J; Ramírez García D; Rajado M; Singh R; Sanchez L; Santos JMF; Sarnoff I; Sartorelli G; Schreiner J; Schulte P; Schulze Eiß{}ing H; Schumann M; Scotto Lavina L; Selvi M; Semeria F; Shagin P; Shi S; Shi J; Silva M; Simgen H; Takeda A; Tan P; Thers D; Toschi F; Trinchero G; Tunnell CD; Tönnies F; Valerius K; Vecchi S; Vetter S; Villazon Solar FI; Volta G; Weinheimer C; Weiss M; Wenz D; Wittweg C; Wu VHS; Xing Y; Xu D; Xu Z; Yamashita M; Yang L; Ye J; Yuan L; Zavattini G; Zhong M

Abstract

We present the first measurement of nuclear recoils from solar 8B 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 × yr resulted in 37 observed events above 0.5 keV, with (26.4 þ1.4 −1.3 ) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of 2.73σ. The measured 8B solar neutrino flux of ð4.7 þ3.6 −2.3 Þ × 106 cm−2 s−1 is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted CEνNS cross section on Xe of ð1.1 þ0.8 −0.5 Þ × 10−39 cm2 is consistent with the Standard Model prediction. This is the first direct measurement of nuclear recoils from solar neutrinos with a dark matter detector.