TY  - JOUR
AU  - T2K Collaboration (Abe, K. et al
AU  - Cervera-Villanueva, A.
AU  - Escudero, L.
AU  - Gomez-Cadenas, J. J.
AU  - Izmaylov, A.
AU  - Monfregola, L.
AU  - Sorel, M.
AU  - Stamoulis, P.
PY  - 2014
DA  - 2014//
TI  - Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation gamma rays
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 072012
EP  - 11pp
VL  - 90
IS  - 7
PB  - Amer Physical Soc
AB  - We report the first measurement of the neutrino-oxygen neutral-current quasielastic (NCQE) cross section gamma It is obtained by observing nuclear deexcitation. rays which follow neutrino-oxygen interactions at the Super-Kamiokande water Cherenkov detector. We use T2K data corresponding to 3.01 x 10(20) 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 x 10(-38) cm(2) with a 68% confidence interval of (1.22, 2.20) x 10(-38) cm(2) at a median neutrino energy of 630 MeV, compared with the theoretical prediction of 2.01 x 10(-38) cm(2).
SN  - 1550-7998
UR  - http://arxiv.org/abs/1403.3140
UR  - https://doi.org/10.1103/PhysRevD.90.072012
DO  - 10.1103/PhysRevD.90.072012
LA  - English
N1  - WOS:000344033100001
ID  - T2KCollaborationAbe_etal2014
ER  -