We report the first measurement of the neutrino-oxygen neutral-current quasielastic (NCQE) cross section. 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??????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.

Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation ?????? rays / K., A., J., A., H. a., A., T., A., C., A., S., A., A., A., T., A., S., A., D., A., M., B., G., B., G., B., M., B., M., B., F., B., S., B., V., B., B. w., B., S., B., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 90:(2014). [10.1103/PhysRevD.90.072012]

Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation ?????? rays

DE ROSA, GIANFRANCA;PALLADINO, VITTORIO;Riccio, Ciro;
2014

Abstract

We report the first measurement of the neutrino-oxygen neutral-current quasielastic (NCQE) cross section. 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??????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.
2014
Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear deexcitation ?????? rays / K., A., J., A., H. a., A., T., A., C., A., S., A., A., A., T., A., S., A., D., A., M., B., G., B., G., B., M., B., M., B., F., B., S., B., V., B., B. w., B., S., B., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 90:(2014). [10.1103/PhysRevD.90.072012]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/598853
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