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Yields and production rates of cosmogenic 9Li and 8He measured with the Double Chooz near and far detectors

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posted on 2023-06-10, 01:45 authored by H de Kerret, T Abrahão, H Almazan, J C dos Anjos, S Appel, J C Barriere, I Bekman, Thiago Sogo BezerraThiago Sogo Bezerra, L Bezrukov, E Blucher, T Brugière, C Buck, J Busenitz, A Cabrera, M Cerrada, The Double Chooz collaboration, others
The yields and production rates of the radioisotopes 9Li and 8He created by cosmic muon spallation on 12C, 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 9Li and 8He decays, the contribution of the 8He radioisotope at both detectors is found to be compatible with zero. The observed 9Li yields in the near and far detectors are 5.51 ± 0.51 and 7.90 ± 0.51, respectively, in units of 10-8µ-1g-1cm2. 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=Y0(/1GeV)a¯, giving a¯=0.72±0.06 and Y0 = (0.43 ± 0.11) × 10-8µ-1g-1cm2. This relationship gives future liquid scintillator based experiments the ability to predict their cosmogenic 9Li background rates.

History

Publication status

  • Published

File Version

  • Published version

Journal

Journal of High Energy Physics

ISSN

1126-6708

Publisher

Springer

Issue

11

Volume

2018

Page range

1-17

Article number

a53

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-11-15

First Open Access (FOA) Date

2021-11-15

First Compliant Deposit (FCD) Date

2021-11-12

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