Pyroelectric X-ray and neutron generator for low background detectors calibration A.S. Chepurnov a, V.Y. Ionidi a, O.O. Ivashchuk b, A.S. Kubankin b,c,

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Presentation transcript:

Pyroelectric X-ray and neutron generator for low background detectors calibration A.S. Chepurnov a, V.Y. Ionidi a, O.O. Ivashchuk b, A.S. Kubankin b,c, A.N. Oleinik b, A.V. Shchagin b,d a Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia b Radiation Physics Laboratory, Belgorod State University, Belgorod, Russia C Lebedev Physical Institute, Moscow, Russia d Kharkov Institute of Physics and Technology, Kharkov, Ukraine International Conference on Particle Physics and Astrophysics (ICPPA 2015) 2015 October 8, Moscow

Calibration neutrino and dark matter detectors using neutrons Neutron source Liquid argon  Scattering event Scattered neutrons Elastic scattering: n+Ar  n+Ar rec Inelastic scattering: n+Ar  n+Ar*  n+Ar rec +  (1.46 MeV) Primary recoil nucleus required for detector calibration can be produced by neutrons. Recoils is produced by elastic scattering on neutrons. A source of neutrons with constant energy and low divergence is required. Possible calibration geometry, if generator is compact Neutron source Liquid argon taken by A. E. Bondar, A. F. Buzulutskov, et al., Proposal for neutron scattering systems for calibration of dark matter search and low-energy neutrino detectors, Vestnik of NSU: Physics Series, pp , vol. 8, n. 3, (2013) (at Russian) James R. Verbus, Brown University, Measurement of Ultra-low Energy Nuclear Recoils in the LUX Detector Using a D-D Neutron Generator, report at workshop “Calibration of low energy particle detectors”, September 23-25, 2015, Chicago.  Scattering event Scattered neutrons

Mechanisms of X-Ray and neutrons generation by pyroelectric crystals X-Ray radiation generation Neutrons (2.45 MeV) generation Positively charged only

Typical X-Ray spectrum from pyroelectric source Data are summarized for three thermal cycles X-Ray emission is indication of proper condition of neutron generation

Advantages of pyroelectric neutron generator for low background detectors calibration Such sources will have a typical size of several cubic centimeters. Pyroelectric source do not contain any radioactive substances and could be manufactured low background. Pyroelectric source don’t need external high voltage power supply. When the pyroelectric source is tuned off, it does not produce any radiation and does not disturbed operation of the detector Fixed neutron energy (2.45 MeV), controllable time-stamp of neutron flux. The source can be tuned on by connecting of a low voltage power supply that should provide variation of the temperature of the pyroelectric crystal.

Experimental setup (Radiation Physics Laboratory, Belgorod) vacuum chamber high vacuum pump vacuum gauge forvacuum pump D 2 buster volume X-Ray detector needle valve γn - detector

Scheme of experimental setup for neutron generation Energy of produced neutrons – 2.45 MeV. The neutrons source should has intensity of several hundred neutrons per thermal cycle.

Current state of the project Production tungsten tip and deuterium target Construction experimental setup for neutron generation First experiment of neutron generation – no success yet Neutron detector SDMF-1206 LiTaO 3 aluminum pad tungsten tip Development in progress….

Next steps Search of optimal condition for neutrons generation from pyroelectric source (thermal conditions, pressure, geometry of source, W-tip characteristics, D-target characteristics). Selection materials with ultra low level of radioactivity for pyroelectric neutron source device. Design and construction of the compact neutron generator for low background detectors calibration Acknowledgement Authors are thankful to S.I. Bashko and his team from ISSP RAS for production of tungsten tips. This study was supported financially by the Russian Foundation for Basic Research, projects ofi_m and the Ministry of Education and Science of the Russian Federation, project /K.

Thank you for attention!

Scattering angle, deg. Recoil energy, keV Energy of Ar recoils Cross-section of scattering taken by A. E. Bondar, A. F. Buzulutskov, et al., Proposal for neutron scattering systems for calibration of dark matter search and low-energy neutrino detectors, Vestnik of NSU: Physics Series, pp , vol. 8, n. 3, (2013) (at Russian) elastic scattering nonelastic scattering Scattering angle, deg. Cross-section, barn

Detector SDMF-1206 (made in Russia) Energy scale for n 350 keV – 12 (14) МeV Energy scale for gamma 100 keV – 6 MeV Power of equivalent doze for mixed n/gamma fields mkSv/s Principle – FADC (PSD) p-recoil /gamma discrimination, p-Terphenyl/Stilben crystal 2 – 4 sm 3 + PMT

Angular dependence of neutron emission cross section [mb / sr], given in terms of the emitted neutron angle relative to the angle of the incident deuteron. Shown for center-of-mass system (dashed line) and laboratory system (solid line). Taken by Y. Danon “A novel compact neutron and X-Ray source”, technical report (2007) Data for incident deuterons with energy 100 keV. If energy of incident deuterons increase, then anisotropy of neutron emission is more.