BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Cosmic muon flux measurements from mid-latitude to Antarctica with
  a novel nested plastic scintillator detector
DTSTART;VALUE=DATE-TIME:20261028T131000Z
DTEND;VALUE=DATE-TIME:20261028T133000Z
DTSTAMP;VALUE=DATE-TIME:20261022T104658Z
UID:indico-contribution-6366@cern.ch
DESCRIPTION:Speakers: Ozturk Sertac (Istinye University)\nWe present cosmi
 c muon flux measurements performed across two geomagnetically distinct env
 ironments with a novel concentric double-layer plastic scintillator telesc
 ope\, developed and produced entirely in-house. The detector employs a nes
 ted geometry in which a cylindrical active core is coaxially enclosed by a
  cup-shaped outer scintillator\, so that coincidence between the two optic
 ally isolated volumes provides active background rejection and wide-angle 
 acceptance within a portable\, two-channel package. Both volumes were cast
  from a custom epoxy-resin matrix doped with PPO and POPOP\, a liquid-phas
 e route that removes the need for geometry-specific glass moulds and permi
 ts complex shapes such as the outer cup\, which would be difficult and cos
 tly to machine from commercial scintillator blocks. GEANT4 simulations giv
 e a geometric factor of 60.6 cm²sr\, in agreement with the Sullivan analy
 tical prediction to within 2% and approximately three times that of a conv
 entional flat two-panel telescope built from the same detector diameters. 
 The nested geometry exhibits no hard angular cut-off\, and its coincidence
  efficiency is flat from 50 MeV to 50 GeV\, so that soft muons below 1 GeV
 /c are registered without loss.\n\nThe system was deployed during the 10th
  Turkish Antarctic Expedition\, with measurements taken at a mid-latitude 
 baseline in Istanbul and at Horseshoe Island\, Antarctica. After barometri
 c correction the Antarctic flux exceeds the Istanbul baseline by approxima
 tely 41%\, consistent with the reduced geomagnetic cut-off rigidity at pol
 ar latitudes and with an appreciable soft-component response\, the latter 
 independently supported by a barometric coefficient ratio of about 3.3 bet
 ween the two sites. A Forbush decrease was also recorded in Istanbul\, coi
 nciding with a Kp ≈ 8 geomagnetic storm driven by a coronal mass ejectio
 n and corroborated by simultaneous neutron monitor data. Pre- and post-exp
 edition fluxes agree within statistical uncertainty\, indicating that inte
 rcontinental transport did not affect the detector response.\n\nThe talk a
 dditionally reports on the wider scintillator development programme from w
 hich this instrument emerged: the optical and scintillation characterisati
 on of the epoxy-resin material against commercial scintillators\, laborato
 ry results on formulations engineered for pulse-shape discrimination inclu
 ding lithium-tetraborate nanoparticle loading for thermal-neutron sensitiv
 ity\, and a Monte Carlo feasibility study of opaque plastic scintillators 
 for muon tomography.\n\nhttps://indico.particle.mephi.ru/event/626/contrib
 utions/6366/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6366/
END:VEVENT
END:VCALENDAR