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SUMMARY:Estimation of contribution of gaseous tritium source rear wall to 
 tritium beta-spectrum in search for sterile neutrinos by Troitsk nu-mass e
 xperiment
DTSTART;VALUE=DATE-TIME:20241023T075500Z
DTEND;VALUE=DATE-TIME:20241023T081000Z
DTSTAMP;VALUE=DATE-TIME:20260909T160255Z
UID:indico-contribution-4392@cern.ch
DESCRIPTION:Speakers: Vladislav Pantuev (Institute for Nuclear Research Ru
 ssian Academy of Sciences)\nThe goal of the Troitsk nu-mass experiment is 
 a search for sterile neutrinos in the tritium beta decay. The decay electr
 ons are produced in the windowless gaseous tritium source\, WGTS. The magn
 etic field in the source is formed by a set of solenoids. Electrons produc
 ed at large pitch angles to the magnet axis are trapped. Electrons at smal
 l angles can leave the WGTS for the spectrometer or in the opposite direct
 ion\, for the rear wall. The spot of electrons escaping from the WGTS to t
 he rear wall increases in diameter due to the fringe field.  These electro
 ns may scatter on the vacuum pipe and at some combination of scattered ang
 le and final energy\, may return to the WGTS and reach the spectrometer an
 d detector. This contamination modifies the original tritium spectrum. We 
 calculate the scattered electron distribution in GEANT4 framework and then
  apply energy and angular cuts to select the electrons that can reach the 
 detector. The relative contribution of such electrons is 4-5 orders of mag
 nitude less at the edge of the original spectrum at 17-18.5 keV\, but reac
 hes 2% at 11 keV. The experimental spectrum fits well with a correction fo
 r this contribution. The study of the rear wall contribution\, its magneti
 c field and material configuration is critical for the TRISTAN project\, t
 he follower of the KATRIN experiment.\n\nhttps://indico.particle.mephi.ru/
 event/436/contributions/4392/
LOCATION: Petrovskiy 2
URL:https://indico.particle.mephi.ru/event/436/contributions/4392/
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