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@INPROCEEDINGS{Kumaran:906367,
      author       = {Kumaran, Sindhujha},
      title        = {{D}irectional measurement in {B}orexino: {C}alibration of
                      {C}herenkov photons in a liquid scintillator detector using
                      gamma sources},
      journal      = {Journal of physics / Conference Series},
      volume       = {2156},
      number       = {1},
      issn         = {1742-6588},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2022-01396},
      pages        = {012184},
      year         = {2021},
      abstract     = {Borexino is a 280-ton liquid scintillator detector located
                      at the Laboratori Nazionali del Gran Sasso (LNGS), Italy.
                      The main goal of Borexino is to measure solar neutrinos via
                      elastic scattering off electrons in the liquid scintillator.
                      The electrons are then detected by the photo-multiplier
                      tubes via isotropically emitted scintillation photons.
                      However, in the first few nanoseconds after a neutrino
                      interaction, Cherenkov photons $(<1\%$ of all detected
                      photons) are also produced in the scintillator for electrons
                      with kinetic energy >0.16 MeV. Borexino has successfully
                      obtained the first directional measurement of sub-MeV solar
                      neutrinos, and the 7Be solar neutrino interaction rate,
                      through the exploitation of this Cherenkov light signal.
                      This is performed through the so-called Correlated and
                      Integrated Directionality (CID) method, by correlating the
                      first few detected photons to the well-known position of the
                      Sun and integrating the angle for a large number of events.
                      This measurement requires a calibration of the relative time
                      differences between Cherenkov and scintillation photons. In
                      Borexino, we obtain this through gamma calibration sources
                      namely, 40K and 54Mn. A group velocity correction estimated
                      through the gamma sources is then used for the solar
                      neutrino analysis. This article will discuss the analysis
                      strategy and methods used for this calibration, and provide
                      motivation for a dedicated Cherenkov calibration in
                      next-generation liquid scintillator detectors.},
      month         = {Aug},
      date          = {2021-08-26},
      organization  = {17th International Conference on
                       Topics in Astroparticle and Underground
                       Physics, Valencia (online) (Spain), 26
                       Aug 2021 - 3 Sep 2021},
      cin          = {IKP-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-2-20111104},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612)},
      pid          = {G:(DE-HGF)POF4-612},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
      doi          = {10.1088/1742-6596/2156/1/012184},
      url          = {https://juser.fz-juelich.de/record/906367},
}