Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear de-excitation $\gamma$-rays - Archive ouverte HAL Access content directly
Journal Articles Physical Review D Year : 2014

Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear de-excitation $\gamma$-rays

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K. Abe
  • Function : Author
J. Adam
  • Function : Author
H. Aihara
  • Function : Author
T. Akiri
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C. Andreopoulos
  • Function : Author
S. Aoki
A. Ariga
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T. Ariga
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S. Assylbekov
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M. Barbi
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Abstract

We report the first measurement of the neutrino-oxygen neutral-current quasi-elastic (NCQE) cross section. It is obtained by observing nuclear de-excitation \gamma-rays which follow neutrino-oxygen interactions at the Super-Kamiokande water Cherenkov detector. We use T2K data corresponding to $3.01 \times 10^{20}$ 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 55.7, which includes an estimated 17.3 background events. The background is primarily non-quasielastic neutral-current interactions and has only 1.2 events from natural radioactivity. The flux-averaged NCQE cross section we measure is $1.35 \times 10^{-38}$ cm$^2$ with a 68% confidence interval of $(1.06, 1.94) \times 10^{-38}$ cm$^2$ at a median neutrino energy of 630 MeV, compared with the theoretical prediction of $2.01 \times 10^{-38}$ cm$^2$.

Dates and versions

in2p3-00962301 , version 1 (21-03-2014)

Identifiers

Cite

K. Abe, J. Adam, H. Aihara, T. Akiri, C. Andreopoulos, et al.. Measurement of the neutrino-oxygen neutral-current interaction cross section by observing nuclear de-excitation $\gamma$-rays. Physical Review D, 2014, 90 (7), pp.072012. ⟨10.1103/PhysRevD.90.072012⟩. ⟨in2p3-00962301⟩
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