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Studies of Helium proportional Studies of Helium proportional counters response on fast neutrons, counters response on fast neutrons,
at NCSR “Demokritos”at NCSR “Demokritos”
M. Zamani, M. Zamani, M. ManolopoulouM. Manolopoulou,,
S. Stoulos, M. Fragopoulou S. Stoulos, M. Fragopoulou
School of Physics, Faculty of SciencesAristotle University of Thessaloniki
Thessaloniki, Hellas
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
ObjectivesObjectives
Optimization of operation parameters of the Optimization of operation parameters of the counterscounters
Determination of counter responseDetermination of counter response Application: Measurement and analysis of Application: Measurement and analysis of
neutron spectra emitted from the spallation neutron spectra emitted from the spallation source “Energy plus Transmutation"source “Energy plus Transmutation"
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Helium counters characteristicsHelium counters characteristics
PressuPressure re
[Atm][Atm]
GasGas
mixturemixture
LengtLengthh
[cm][cm]
DiametDiameter [cm]er [cm]
He-3He-3 66
33He 65%He 65%
Kr 33%Kr 33%
COCO2 2 2% 2%1515 55
He-4He-4 181844He 99%He 99%
COCO2 2 1% 1%6060 55
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Irradiations at the Institute of Irradiations at the Institute of Nuclear Physics, NCSR Demokritos Nuclear Physics, NCSR Demokritos
Proton Beam:Proton Beam: 2.0 – 5.0 MeV 2.0 – 5.0 MeV77Li(p,n)Li(p,n)77Be neutron energy: 0.23 – 3.3 MeVBe neutron energy: 0.23 – 3.3 MeV
Deuteron Beam:Deuteron Beam: 1.4 – 7.8 MeV 1.4 – 7.8 MeV22H(d,n)H(d,n)33He neutron energy: 3.7 – 10.7 MeVHe neutron energy: 3.7 – 10.7 MeV33H(d,n)H(d,n)44He neutron energy: 17.5 – 20.5 MeVHe neutron energy: 17.5 – 20.5 MeV
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
He-3 counter spectraHe-3 counter spectra
Full energy Full energy peakpeak
33He(n,p)He(n,p)33HH
Recoil peak Recoil peak 33He(n,elastic)He(n,elastic)
33He(n,d)He(n,d)22HH
Thermal – epithermal peak (764 keV)Thermal – epithermal peak (764 keV)
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
He-4 counter spectraHe-4 counter spectra
44He(n,elastic)He(n,elastic)
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Operational characteristics of He-3 Operational characteristics of He-3 and He-4 countersand He-4 counters
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
““Energy plus Transmutation” Energy plus Transmutation” setupsetup
Pb target: Diameter 8.4 cm, Length 48 cm Natural Uranium ≈206 kg NUCLOTRON accelerator, Laboratory NUCLOTRON accelerator, Laboratory of High Energies, Dubna - JINRof High Energies, Dubna - JINR
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Neutron energy distributionNeutron energy distributioncalculated by DCM-DEM codecalculated by DCM-DEM code
Proton beam: 1 GeVProton beam: 1 GeV
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Irradiation of “Energy plus Irradiation of “Energy plus Transmutation” setup with Transmutation” setup with
Deuterons 1.6 GeVDeuterons 1.6 GeV
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Neutron energy distributionNeutron energy distribution(preliminary results)(preliminary results)
ARISTOTLE UNIVERSITY OF THESSALONIKIARISTOTLE UNIVERSITY OF THESSALONIKI
Future plansFuture plans
Calibration of neutron dosimeter Calibration of neutron dosimeter systems based on SSNT detectors.systems based on SSNT detectors.
Study of proton track geometrical Study of proton track geometrical parameters on SSNT detectors for parameters on SSNT detectors for application in neutron spectroscopy.application in neutron spectroscopy.
Fast neutron dosimetry with MOSFET.Fast neutron dosimetry with MOSFET. Cross section of (Cross section of (α,α,n) and (p,n) n) and (p,n)
reactions in the energy region of reactions in the energy region of several MeV.several MeV.
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