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SUMMARY:Development of the Cold Neutron Beam Shaping Assembly for the Acce
 lerator-based Neutron Source VITA
DTSTART;VALUE=DATE-TIME:20230913T105000Z
DTEND;VALUE=DATE-TIME:20230913T105100Z
DTSTAMP;VALUE=DATE-TIME:20260814T153440Z
UID:indico-contribution-2576@indico.inp.nsk.su
DESCRIPTION:Speakers: Viktoriia Konovalova (Budker Institute of Nuclear Ph
 ysics)\nA promising method for treating malignant tumors - boron neutron c
 apture therapy (BNCT) is being actively developed at the Budker Institute 
 of Nuclear Physics. This method is based on the absorption of neutrons by 
 boron-10 preliminarily accumulated in the tumor. The cross-section of the 
 neutron capture of boron-10 increases with the neutron energy decrease. No
 wadays\, the most optimal neutron energy for BNCT is the energy of the epi
 thermal range (1-30 keV). Neutrons with this energy effectively penetrate 
 4 cm into human tissues. Neutron delivery to a deeper distance will allow 
 to increase localization of a therapeutic dose in a tumor\, exclude impact
  on healthy cells of a patient and increase BNСT efficiency both in case 
 of deep lying malignant tumors and those on the surface. Neutrons with ene
 rgies of the order of 10-4 eV (cold neutrons) have distinct wave propertie
 s that allow transporting them via flexible neutron guides. To realize thi
 s idea\, it is necessary to produce cold neutrons. This work was devoted t
 o the production of cold neutrons at the accelerator-based neutron source 
 VITA.\nThe paper describes the developed cold neutron Beam shaping assembl
 y (BSA). The modeling of the neutrons passage through the proposed BSA was
  performed by Geant4 software. The modeling corresponds to the experiments
  geometry. The series of experiments aimed at investigation of the moderat
 ing properties of the selected materials - plexiglas\, water\, and heavy w
 ater - are conducted. The initial neutron beam with an average energy of 3
 0 keV and an intensity of 2‧1012 n/s was obtained at the accelerator-bas
 ed neutron source by the 7Li(p\,n)7Be threshold reaction. The energy of th
 e incident proton beam on the lithium target was 2.1 MeV. Thus\, a multile
 vel moderating system consisting of heavy and ordinary water at room tempe
 rature and 73 K is tested as a moderator. After passing through the system
 \, neutrons were registered with a neutron detector\, based on plastic pol
 ystyrene scintillators enriched with boron (IHEP\, Protvino).\nThe possibi
 lity of generation of cold neutrons at the accelerator-based neutron sourc
 e at the Budker Institute of Nuclear Physics has been demonstrated. \nThis
  research was funded by Russian Science Foundation\, grant number 19 72 30
 005\, https://rscf.ru/project/19-72-30005.\n\nhttps://indico.inp.nsk.su/ev
 ent/114/contributions/2576/
LOCATION:
URL:https://indico.inp.nsk.su/event/114/contributions/2576/
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