Journal Article

Double Chooz θ13 measurement via total neutron capture detection

Ishitsuka, M, Bezerra, T J, Kuze, M, Cerrada, M, Gonzalez, L F, Lima, H P, Kawasaki, T, Viaud, B, Chimenti, P, Stokes L F F, Stahl, A, Kale, K, LoSecco, J M, Kemp, E, López-Castaño, J M, Lasserre, T, Bekman, I, Yang, G, Brugière, T, Sukhotin, S, de, Kerret H, Djurcic, Z, Jollet, C, Kryn, D, Navas-Nicolás, D, Obolensky, M, Stancu, I, Martino, J, Etenko, A, Palomares, C, Onillon, A, Yermia, F, Goodman, M C, Appel, S, Matsubara, T, Soldin, P, Lhuillier, D, Sinev, V, Gomez, H, Sibille, V, dos Anjos J C, Schönert, S, Veyssiere, C, Hellwig, D, Scola, L, Abrahão, T, Chauveau, E, Lindner, M, Dawson, J V, Maricic, J, Gil-Botella, I, Novella, P, Sumiyoshi, T, Busenitz, J, Minotti, A, Schoppmann, S, Lachenmaier, T, Lubsandorzhiev, B, Meregaglia, A, Suekane, F, Furuta, H, Reichenbacher, J, Lane, C E, Oralbaev, A, Corpace, O, Wagner, S, Givaudan, A, Maeda, J, Hourlier, A, Wiebusch, C, Haser, J, Karakac, M, Hara, T, Mariani, C, Miletic, T, Milincic, R, Blucher, E, Reinhold, B, Oberauer, L, Cabrera, A, Barriere, J C, Skorokhvatov, M, Vivier, M, Mention, G, Pepe, I M, Lastoria, C, Buck, C, Bezrukov, L, Pronost, G, Almazan, H, Jochum, J, Kaneda, M, Sun, Y, Sharankova, R

2020

Overview

Neutrinos were assumed to be massless particles until the discovery of the neutrino oscillation process. This phenomenon indicates that the neutrinos have non-zero masses and the mass eigenstates ( ν 1 , ν 2 , ν 3 ) are mixtures of their flavour eigenstates ( ν e , ν μ , ν τ ). The oscillations between different flavour eigenstates are described by three mixing angles ( θ 12 , θ 23 , θ 13 ), two differences of the squared neutrino masses of the ν 2 / ν 1 and ν 3 / ν 1 pairs and a charge conjugation parity symmetry violating phase δ CP . The Double Chooz experiment, located near the Chooz Electricité de France reactors, measures the oscillation parameter θ 13 using reactor neutrinos. Here, the Double Chooz collaboration reports the measurement of the mixing angle θ 13 with the new total neutron capture detection technique from the full data set, yielding sin 2 (2 θ 13 ) = 0.105 ± 0.014. This measurement exploits the multidetector configuration, the isoflux baseline and data recorded when the reactors were switched off. In addition to the neutrino mixing angle measurement, Double Chooz provides a precise measurement of the reactor neutrino flux, given by the mean cross-section per fission 〈 σ f 〉 = (5.71 ± 0.06) × 10 −43  cm 2 per fission, and reports an empirical model of the distortion in the reactor neutrino spectrum. The Double Chooz collaboration reports the neutrino oscillation parameter θ 13 from a measurement of the disappearance of reactor anti-electron neutrinos with the total neutron capture technique.

• Publisher: Nature Publishing Group UK,Nature Publishing Group,Nature Publishing Group (NPG)
• Subject: 639/766/419/1131 / Atomic / Classical and Continuum Physics / Collaboration / Complex Systems / Condensed Matter Physics / Conjugation / Eigenvectors / Fission / Flavor (particle physics) / Mathematical and Computational Physics / Molecular / Neutrinos / Neutron flux / Nuclear capture / Optical and Plasma Physics / Parameters / Physics / Physics and Astronomy / Reactors / Theoretical