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SUMMARY:A double-sided thin entrance window Si(Li) detector for the applic
 ation in multilayer detector systems.
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261101T201513Z
UID:indico-contribution-6421@cern.ch
DESCRIPTION:Speakers: Maxim Trushin (PNPI)\nPrecise measurements of β-spe
 ctra are highly relevant for a number of physical areas. For the investiga
 tions of the neutrino processes at nuclear reactors\, such as the reaction
  of inverse beta-decay\, elastic neutrino scattering on an electron or coh
 erent scattering on nuclei\, an accurate quantitative determination of the
  electron antineutrinos spectrum is required. These electron antineutrinos
  are emitted during beta-decays of fission fragments of uranium and pluton
 ium isotopes\, as well as during beta decays of various nuclei that arise 
 as a result of neutron capture\, so their  spectrum can be reconstructed f
 rom the measured beta-spectra. \n	Our lab develops an experimental setup o
 f beta-spectrometer based on silicon-lithium drift Si(Li) detectors design
 ed to carry out the precise measurements of the beta spectra of various fi
 ssile isotopes of uranium and plutonium in the scheduled experiment at the
  PIK reactor after its launch. Individual Si(Li) detectors can be manufact
 ured with a sensitive region thickness of up to 1 cm\, which is sufficient
  to absorb electrons with an energy of up to 3.5 MeV. To register the elec
 trons with higher energies the multilayer spectrometer consisting of sever
 al Si(Li) detectors is required.\n	However\, usual Si(Li) detectors manufa
 ctured using standard technology have an unacceptably thick entrance windo
 w from the n-contact side. We propose an alternative method for n-contact 
 creation allowing to produce the Si(Li) detectors with a thin entrance win
 dow from both n- and p-sides. An assembly of three such thin-window Si(Li)
  detectors will make it possible to register the full energy of 10 MeV bet
 a-electrons. At the Conference the detailed description of the spectrometr
 ic properties of individual double-sided thin-window Si(Li) detectors and 
 the results of entrance windows thickness measurements will be presented a
 nd discussed.\n	To suppress the accompanying gamma background a silicon tr
 ansition detector with a thickness of 100–300 μm will be positioned in 
 front of the first layer of Si(Li) detectors. Such configuration of the de
 tectors effectively suppressed the background signals\, but leads to a det
 erioration in the energy resolution of the spectra measured by the Si(Li) 
 detector due to the passage of beta-electrons through the transition detec
 tor. The procedure of Si(Li) detector energy resolution restoration by the
  summation of pulse amplitudes of both detectors will also be discussed.\n
 \nhttps://indico.particle.mephi.ru/event/626/contributions/6421/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6421/
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