Yields and production rates of cosmogenic [superscript 9]Li and [superscript 8]He measured with the Double Chooz near and far detectors
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13130_2018_Article_9360.pdf
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Author(s)
de Kerret, H.
Abrahão, T.
Almazan, H.
dos Anjos, J. C
Appel, S.
Barriere, J. C
Bekman, I.
Bezerra, T. J C
Bezrukov, L.
Blucher, E.
Date Issued
November 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The Double Chooz collaboration, et al. “Yields and Production Rates of Cosmogenic [superscript 9]Li and [superscript 8]He Measured with the Double Chooz near and Far Detectors.” Journal of High Energy Physics, vol. 2018, no. 11, Nov. 2018.
Version
Final published version
Abstract
The yields and production rates of the radioisotopes [superscript 9]Li and [superscript 8]He created by cosmic muon spallation on [superscript 12]C, have been measured by the two detectors of the Double Chooz experiment. The identical detectors are located at separate sites and depths, which means that they are subject to different muon spectra. The near (far) detector has an overburden of ∼120 m.w.e. (∼300 m.w.e.) corresponding to a mean muon energy of 32.1 ± 2.0 GeV (63.7 ± 5.5 GeV). Comparing the data to a detailed simulation of the [superscript 9]Li and [superscript 8]He decays, the contribution of the [superscript 8]He radioisotope at both detectors is found to be compatible with zero. The observed [superscript 9]Li yields in the near and far detectors are 5.51 ± 0.51 and 7.90 ± 0.51, respectively, in units of 10[superscript −8]μ[superscript −1]g[superscript −1]cm[superscript 2]. The shallow overburdens of the near and far detectors give a unique insight when combined with measurements by KamLAND and Borexino to give the first multi-experiment, data driven relationship between the 9Li yield and the mean muon energy according to the power law Y=Y[subscript 0](⟨E[subscript μ]⟩/1 GeV)[superscript ¯ over α], giving [¯over α]=0.72±0.06 and Y0 = (0.43 ± 0.11) × 10[superscript −8]μ[superscript −1]g[superscript −1]cm[superscript 2]. This relationship gives future liquid scintillator based experiments the ability to predict their cosmogenic [superscript 9]Li background rates.
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Keywords
Neutrino Detectors and Telescopes (experiments)
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1007/JHEP11(2018)053
