Production of radioactive isotopes through cosmic muon spallation in KamLAND

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Bibliographic Information

Published
2010-02-23
Resource Type
journal article
Rights Information
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevc.81.025807
  • 10.1103/physrevc.84.035804
  • 10.48550/arxiv.1106.0861
  • 10.17615/akh5-yw64
  • 10.48550/arxiv.0907.0066
  • 10.17615/d49a-ay54
Publisher
American Physical Society (APS)

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Description

We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5 MeV analysis threshold is 1.49+/-0.14(stat)+/-0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a 8B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77+/-0.26(stat)+/-0.32(syst) x 10^6 cm^-2s^-1. The analysis threshold is driven by 208Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic 11Be. The measured rate is consistent with existing measurements and with Standard Solar Model predictions which include matter enhanced neutrino oscillation.

6 pages, 3 figures

Journal

  • Physical Review C

    Physical Review C 81 (2), 025807-, 2010-02-23

    American Physical Society (APS)

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