Muon capture on light isotopes measured with the Double Chooz detector

Abe, Y, Abrahão, T, Almazan, H, Alt, C, Appel, S, Barriere, J C, Baussan, E, Bekman, I, Bergevin, M, Bezerra, T J C, Bezrukov, L, Blucher, E, Brugière, T, Buck, C, Busenitz, J, Double Chooz Collaboration, and others, (2016) Muon capture on light isotopes measured with the Double Chooz detector. Physical Review C, 93 (5). a054608 1-18. ISSN 2469-9985

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Abstract

Using the Double Chooz detector, designed to measure the neutrino mixing angle θ13, the products of μ- capture on C12,C13,N14, and O16 have been measured. Over a period of 489.5 days, 2.3×106 stopping cosmic μ- have been collected, of which 1.8×105 captured on carbon, nitrogen, or oxygen nuclei in the inner detector scintillator or acrylic vessels. The resulting isotopes were tagged using prompt neutron emission (when applicable), the subsequent β decays, and, in some cases, β-delayed neutrons. The most precise measurement of the rate of C12(μ-,ν)B12 to date is reported: 6.57-0.21+0.11×103s-1, or (17.35-0.59+0.35)% of nuclear captures. By tagging excited states emitting γs, the ground state transition rate to B12 has been determined to be 5.68-0.23+0.14×103s-1. The heretofore unobserved reactions C12(μ-,να)Li8,C13(μ-,νnα)Li8, and C13(μ-,νn)B12 are measured. Further, a population of βn decays following stopping muons is identified with 5.5σ significance. Statistics limit our ability to identify these decays definitively. Assuming negligible production of He8, the reaction C13(μ-,να)Li9 is found to be present at the 2.7σ level. Limits are set on a variety of other processes.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 15 Nov 2021 17:17
Last Modified: 15 Nov 2021 17:30
URI: http://sro.sussex.ac.uk/id/eprint/102892

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