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Using of Boron Waste as a Shielding Material on Landmine Detection with NBS Imaging Technique

100%
Baysoy D.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
569-571
EN
Boron wastes are produced as a result of production route of boron products and these wastes still contain a small amount of boron. In order to understand the possible use of boron waste in non-metallic landmine detection as a shielding, Monte Carlo simulations were applied by neutron backscattering imaging technique using two different neutron sources of ²⁵²Cf and deuterium-deuterium (D-D) reaction. NBS imaging detector system consists of a group of thermal neutron ³He detectors. To investigate the performance of the landmine detection system, a suitable shield around the neutron source was designed and this system was tested for localisation of buried landmine.
2
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Project of the Underwater System for Chemical Threat Detection

100%
Silarski M., Hunik D., Moskal P., Smolis M., Tadeja S.
Acta Physica Polonica A
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2015
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vol. 127
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issue 5
1543-1547
EN
In this article we describe a novel method for the detection of explosives and other hazardous substances in the marine environment using neutron activation. Unlike the other considered methods based on this technique we propose to use guides for neutron and gamma quanta which speeds up and simplifies identification. Moreover, it may provide a determination of the density distribution of a dangerous substance. First preliminary results of Monte Carlo simulations dedicated for design of a device exploiting this method are also presented.
3
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Low Temperature Neutron and Synchrotron Diffraction Studies of KEr(MoO_4)_2 Single Crystal in External Magnetic Field

100%
Maťaš S., Orendáčová A., Prokeš K., Feyerherm R., Dudzik E., Klemke B.
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issue 5
897-899
EN
We report on low temperature magnetic properties of KEr(MoO_4)_2 single crystal, which was investigated from 0.28 K to 30 K in magnetic fields up to 6.5 T. Neutron elastic data collected above and below transition temperature T_{N} ≈ 0.95 K suggest that an antiferromagnetic ordering establishes at low temperatures. The magnetic model within the A_{x}C_{z} mode assuming only magnetic moment at erbium atom positions is suggested. Synchrotron experiment in moderate magnetic fields at temperatures above T_{N} explains the origin of observed signal(s) at (0K0) reflection positions, K odd.
4
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Connection between Reorientational Motions of NH_{3} Groups and Phase Transitions in [Ni(NH_{3})_{6}](NO_{3})_{2} and [Mg(NH_{3})_{6}](NO_{3})_{2} Compounds

100%
Migdał-Mikuli A., Mikuli E.
Acta Physica Polonica A
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1995
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vol. 88
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issue 3
527-532
EN
Quasielastic neutron scattering data for [Νi(ΝH_{3})_{6}](ΝO_{3})_{2} and [Mg(ΝH_{3})_{6}](NO_{3})_{2} were subjected to a new analysis. On the basis of the excess of intensity of elastic component observed in these spectra in comparison to the intensity of this component resulting from the applied reorientational model this analysis determined temperature dependence of the new "R" parameter. This parameter gives us information concerning the number of these NH_{3} groups which in the [Me(NΗ_{3})_{6}]^{2+} cation reorientate with the correlation time of order of 10^{-12} s. It has been ascertained that in phases I and II of both substances under study all NH_{3} groups reorientate fast (R = 6ΝH_{3} groups), whereas in phases III and IV only part of these groups reorientate fast (R = 3ΝΗ_{3} groups - in the case of [Νi(ΝΗ_{3})_{6}](ΝO_{3})_{2} and R = 2ΝΗ_{3} groups - in the case of [Mg(ΝΗ_{3})_{6}](NO_{3})_{2}). Moreover, the temperature dependence of reorientational correlation time τ for these fast reorienting ΝH_{3} groups were also determined. The remaining NH_{3} groups reorientate on a much slower time scale. Both temperature dependencies: R vs. Τ and τ vs. Τ register a deep thermal hysteresis of the phase transition: phase II - phase III (Τ^{h}_{C2} - T^{c}_{C2} ≈ 95 K and ≈ 35 K respectively for [Ni(ΝΗ_{3})_{6}](ΝO_{3})_{2} and [Mg(ΝΗ_{3})_{6}](NO_{3})_{2}).
5
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The Low Temperature Study of Ln[Fe(CN)_6]·xH_2O Rare-Earth Ferricyanides, Ln=Pr,La

100%
Maťaš S., Mitróová Z., Kiefer K., Ryll H., Prokeš K.
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issue 5
962-964
EN
We present magnetic and structural properties of Ln[Fe(CN)_6]·xH_2O, Ln = Pr, La single crystals investigated by means of elastic neutron diffraction and heat capacity down to 0.03 K and susceptibility and magnetization measurements. The susceptibility data were taken on the commercial SQUID magnetometer (Quantum Design) in the range between 2 K and 30 K and in fields up to 5 T. Our low temperature neutron diffraction data taken in a zero field rules out some of antiferromagnetic models suggested in the literature.
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