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SUMMARY:Neutron Studies in a Highly Segmented Detector of the T2K Experime
 nt
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261107T201151Z
UID:indico-contribution-6444@cern.ch
DESCRIPTION:Speakers: Alexey Razgonyaev ()\nThe T2K long-baseline neutrino
  experiment studies neutrino oscillations using a beam produced at J-PARC\
 , the near-detector complex ND280\, and the Super-Kamiokande far detector.
  The upgraded ND280 includes the Super Fine-Grained Detector (SuperFGD)\, 
 a highly segmented plastic-scintillator target with three-dimensional read
 out and precise timing capabilities. These features make SuperFGD particul
 arly suitable for neutron studies\, since neutrons do not leave a direct i
 onization track before interacting.\n\nThis work presents a Monte Carlo st
 udy of neutron transport and energy reconstruction in SuperFGD. First\, mo
 noenergetic neutron samples were used to study flux attenuation as a funct
 ion of detector depth and neutron kinetic energy. An energy-dependent neut
 ron interaction cross section was extracted using the positions of first i
 nteractions and compared with the published SuperFGD prototype measurement
  on hydrocarbon.\n\nThe analysis was then extended to charged-current muon
  antineutrino interactions inside SuperFGD. Events were classified by inte
 raction mechanism and final-state topology\, with particular attention to 
 neutron-containing final states. For each primary neutron\, its kinetic en
 ergy was reconstructed using the flight distance and time interval between
  its production point and first hadronic interaction. For neutrons whose f
 irst hadronic interaction occurs inside the active detector volume\, the T
 OF-reconstructed kinetic energy shows a strong correlation with the true v
 alue. A major limitation at the truth level is the finite detector volume\
 , since some neutrons leave SuperFGD before interacting.\n\nThe TOF-recons
 tructed neutron energies were then used in a simplified truth-level calori
 metric reconstruction of the incident muon antineutrino energy. The result
  was compared with an otherwise identical estimator using the true neutron
  kinetic energies. The comparison shows that TOF reconstruction introduces
  only a small additional energy bias. This demonstrates the potential of n
 eutron time-of-flight information for accounting for the energy carried by
  neutrons in charged-current antineutrino events. The remaining energy imb
 alance requires further study\, including the role of nuclear effects and 
 the treatment of the final state. Future work will also include detector r
 esponse\, finite timing resolution\, detection thresholds\, and hit-level 
 reconstruction.\n\nhttps://indico.particle.mephi.ru/event/626/contribution
 s/6444/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6444/
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