Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation γ rays
Physical Review D - Particles, Fields, Gravitation and Cosmology
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We report the first measurement of the neutrino-oxygen neutral-current quasielastic (NCQE) cross section. It is obtained by observing nuclear deexcitation γ rays which follow neutrino-oxygen interactions at the Super-Kamiokande water Cherenkov detector. We use T2K data corresponding to 3.01×1020 protons on target. By selecting only events during the T2K beam window and with well-reconstructed vertices in the fiducial volume, the large background rate from natural radioactivity is dramatically reduced. We observe 43 events in the 4-30 MeV reconstructed energy window, compared with an expectation of 51.0, which includes an estimated 16.2 background events. The background is primarily nonquasielastic neutral-current interactions and has only 1.2 events from natural radioactivity. The flux-averaged NCQE cross section we measure is 1.55×10-38cm2 with a 68% confidence interval of (1.22,2.20)×10-38cm2 at a median neutrino energy of 630 MeV, compared with the theoretical prediction of 2.01×10-38cm2.
AuthorsAbe, KA; Adam, JA; Aihara, HWA; Akiri, TI; Andreopoulos, CA; Aoki, SX; Ariga, AB; Ariga, TB; Assylbekov, SH; Autiero, DA; Barbi, MA; Barker, GJB; Barr, GA; Bass, MH; Batkiewicz, MM; Bay, FK; Bentham, SWZ; Berardi, VR; Berger, BEHW; Berkman, SD; Bertram, IZ; Bhadra, SB; Blaszczyk, FDMA; Blondel, AL; Bojechko, CA; Bordoni, SO; Boyd, SBB; Brailsford, DQ; Bravar, AL; Bronner, CW; Buchanan, NH; Calland, RGA; Caravaca Rodríguez, JO; Cartwright, SLA; Castillo, RO; Catanesi, MGR; Cervera, AP; Cherdack, DH; Christodoulou, GA; Clifton, AH; Coleman, JA; Coleman, SJG; Collazuol, GT; Connolly, KB; Cremonesi, LA; Dabrowska, AM; Danko, IA; Das, RH; Davis, SB; De Perio, PA; De Rosa, GS; Dealtry, TAA; Dennis, SRAB; Densham, CA; Dewhurst, DA; Di Lodovico, FA; Di Luise, SK; Drapier, OJ; Duboyski, TA; Duffy, KA; Dufour, FL; Dumarchez, JA; Dytman, SA; Dziewiecki, MB; Emery-Schrenk, SF; Ereditato, AB; Escudero, LP; Finch, AJZ; Fiorentini Aguirre, GAB; Friend, MN; Fujii, YN; Fukuda, YA; Furmanski, APB; Galymov, VA; Gaudin, AA; Giffin, SA; Giganti, CA; Gilje, KA; Goeldi, DB; Golan, TB; Gomez-Cadenas, JJP; Gonin, MJ; Grant, NZ; Gudin, DV; Hadley, DRB; Haegel, LL; Haesler, AL; Haigh, MDB; Hamilton, PQ; Hansen, DA; Hara, TX; Hartz, MWA; Hasegawa, TN; Hastings, NCA; Hayato, YWA; Hearty, CD; Helmer, RLA; Hierholzer, MB; Hignight, JA; Hillairet, AA; et al.
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