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Том 43, № 11 (2016)
- Год: 2016
- Статей: 6
- URL: https://journals.rcsi.science/1068-3356/issue/view/14080
Article
Measurement of distribution anisotropy of X-ray yield from a pyroelectric crystal surface
Аннотация
A technique for measuring the spatial distribution of X-rays generated by a pyroelectric source is developed and tested. Anisotropy in the spatial distribution of X-rays from the surface perpendicular to the pyroelectric axis of the lithium niobate crystal depending on the piezoelectric crystal axis orientation was detected. The result obtained shows the necessity of considering the effect of piezoelectric properties of pyroelectric crystals on X-ray generation processes.
319-322
Method for identifying low-energy antiprotons using the electromagnetic position-sensitive calorimeter of the PAMELA spectrometer
Аннотация
The PAMELA experiment on the study of cosmic rays in a wide energy range was performed onboard the Resurs-DK1 spacecraft from June 2006 to February 2016. The data on antiproton fluxes in the near-Earth space play an important role for this field of physics. Their detection by the PAMELA spectrometer is possible using two independent detectors: the track system in a magnetic field and the position-sensitive calorimeter (in the low-energy region, <1 GeV). The presented technique for identifying antiprotons is based on the analysis of tracks of the antiproton and secondary charged mesons produced during its annihilation in the calorimeter. This technique allows identification of antiprotons with energies of 200–800 MeV, independently confirming the data of a magnetic analysis and increasing the statistics due to the larger geometrical factor of the calorimeter in comparison with a track system.
323-327
328-331
Inspection methods for spacecrafts with nuclear power plants
Аннотация
Inspection methods for space objects (SOs) using an active apparatus with onboard detecting equipment are considered. A method based on sequential maneuvering of a spacecraft inspector in the equatorial plane to the points of convergence with various inspected objects in crossed orbits is proposed.
332-335
Nature of radiation resistance of LFS oxyorthosilicate crystals doped with Ce, Sc, Ca, and Y ions
Аннотация
Optical and luminescence characteristics of Lu2+2ySi1-yO5+y (LFS) scintillation crystals are studied before and after irradiation with doses to 45 Mrad from a 60Co source. LFS crystals were doped with Ce3+, Sc3+, Ca2+, and Y3+ ions with various concentrations. The dependence of the radiation resistance of LFS crystals on Ce ion concentration is detected. For the crystal of composition Ce:Sc:Ca:Y:LFS, it was found that its optical transmission (OT) and pulsed cathodoluminescence (PCL) spectra before irradiation do not differ from the spectra measured after irradiation with a dose of 45 Mrad within experimental error. The nature of the radiation resistance of rare-earth lutetium oxyorthosilicates (LFS) is discussed.
336-339
On the formation of vortex light beams at the surface photorefractive effect in NLC
Аннотация
The formation of beams with wavefront screw dislocation appeared when circularly polarized light passes through a light-induced orientation defect formed in a homeotropically oriented NLC at the surface photorefractive effect is calculated. NLCs with negative and positive low-frequency dielectric anisotropy are considered. The calculated data are compared with the results of previously performed experiments.
340-344