2015/09/30 by Kamiokande Collaboration, Yang Zhang, K. Abe +98
Chemistry · Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Chemistry #Cosmic ray #Decay chain #Detector #Isotope #Muon #Neutrino #Neutrino Physics Research #Neutrino oscillation #Neutron #Nuclear physics #Particle physics theoretical and experimental studies #Physics #Radiochemistry #Scintillator #Solar neutrino #Spallation #Super-Kamiokande #Supernova #astro-ph.HE #hep-ex #hep-ph #physics.ins-det
paper · pdf · doi:10.1103/physrevd.93.012004
published as Phys. Rev. D 93, 012004 (2016) · 12 pages, 6 figures, accepted by PRD for publication
arxiv created 2015/12/11 · openalex publication_date 2016/01/15 · arxiv updated 2016/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Cosmic-ray-muon spallation-induced radioactive isotopes with \ensuremathβ decays are one of the major backgrounds for solar, reactor, and supernova relic neutrino experiments. Unlike in scintillator, production yields for cosmogenic backgrounds in water have not been exclusively measured before, yet they are becoming more and more important in next generation neutrino experiments designed to search for rare signals. We have analyzed the low-energy trigger data collected at Super-Kamiokande IV in order to determine the production rates of 12B, 12N, 16N, 11Be, 9Li, 8He, 9C, 8Li, 8B, and 15C. These rates were extracted from fits to time differences between parent muons and subsequent daughter \ensuremathβ's by fixing the known isotope lifetimes. Since 9Li can fake an inverse-beta-decay reaction chain via a \ensuremathβ+n cascade decay, producing an irreducible background with detected energy up to a dozen MeV, a dedicated study is needed for evaluating its impact on future measurements; the application of a neutron tagging technique using correlated triggers was found to improve this 9Li measurement. The measured yields were generally found to be comparable with theoretical calculations, except the cases of the isotopes 8Li/8B and 9Li.