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Crystal Growth of Low Dimensional Spin Systems
A.V.Prokofiev,W.Assmus 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.2
Crystal growth of the quasi-low dimensional spin systems (VO)2P2O7, LiCuVO4, a-CuV2O6 and CuSb2O6 is reported. All substances are characterized by different kinds of instabilities. Vanadyl pyrophosphate either oxidizes in air or reduces in an inert atmosphere. It can be grown, however, from the melt in a special atmosphere, containing 0.1-0.7 mol.% of oxygen. The other compounds decompose before melting inevitably. Therefore techniques allowing growth at lower temperature were applied. Crystals of LiCuVO4 and a-CuV2O6 were grown from a flux. Corresponding phase diagrams solute-solvent were determined. For growth of CuSb2O6 crystals a chemical vapour transport technique was developed. The chemical processes in the gaseous phase were analyzed using thermodynamical calculations. The grown crystals were characterized by X-ray diffractometry and scanning electron microscopy with energy/wavelength dispersive X-ray analysis.
Light-Ion Production from a Thin Silicon Target Bombarded by 175 MeV Quasi Monoenergetic Neutrons
S. Hirayama,Y. Watanabe,Y. Naitou,P. Andersson,R. Bevilacqua,C. Gustavsson,M. Osterlund,S. Pomp,V. Simutkin,H. Sjostrand,A. Hjalmarsson,A. Prokofiev,M. Tesinsky,U. Tippawan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Double-differential production yields of light ions (p, d, t, ^3He, and α from a thin silicon target induced by 175 MeV quasi mono-energetic neutrons were measured using the MEDLEY setup at the The Svedberg Laboratory (TSL) in Uppsala in order to benchmark evaluated nuclear data and nuclear reaction models. The MEDLEY is a conventional spectrometer system which consists of eight counter telescopes. Each telescope is composed of two silicon surface barrier detectors as the ΔE detectors and a CsI(Tl) scintillator as the E detector for particle identification. The telescopes are placed at angles from 20˚ to 160˚ in steps of 20˚. The measured double-differential yields of light ions are compared with PHITS calculations using the following nuclear reaction options: the high-energy nuclear data library (JENDL/HE-2007), the quantum molecular dynamics (QMD) model, and the intra-nuclear cascade (INC) model.
Light-Ion Production in The Interaction of 175 MeV Neutrons with Iron and Bismuth
R. Bevilacqua,S. Pomp,V. D. Simutkin,U. Tippawan,M. Hayashi,S. Hirayama,Y. Naitou,Y. Watanabe,A. V. Prokofiev,A. Hjalmarsson,P. Andersson,J. Blomgren,M. Osterlund,M. Tesinsky,F. -R. Lecolley,N. Marie 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We have measured double-differential (angle and energy) cross sections for light-ion (p, d, t, ^3He, and α) production in the interaction of quasi-monoenergetic 175 MeV neutrons with iron and bismuth. Measurements have been performed at the The Svedberg Laboratory, Uppsala (Sweden), using the Medley setup which allows low-energy thresholds and wide energy and angular ranges. Medley is a spectrometer system consisting of eight three-element telescopes placed at angles from 20˚ to 160˚, in steps of 20˚. Each telescope is composed of two silicon surface barrier detectors and a CsI(Tl) scintillator, to perform particle identification,fully stop the produced light-ions and measure their kinetic energy. The time-of-flight was used to reduce the contribution from the low energy tail in the accepted incident neutron spectrum. We report double-differential production cross sections for protons, deuterons, tritons, ^3He and α particles and compare them with model calculations with TALYS-1.2.
Neutron Elastic Scattering Cross-Section Measurements at 175 MeV
M. Tesinsky,P. Andersson,C. Gustavsson,S. Pomp,Osterlund,J. Blomgren,V. Simutkin,R. Bevilacqua,A. Hjalmarsson,A. Prokofiev,U. Tippawan,F. -R. Lecolley,N. Marie,A. Kolozhvari 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
An off-line data analysis of an experimental campaign on elastic neutron cross-section measurements at 175 MeV for iron and bismuth performed by the scandal set-up has started. Energy calibration has shown expected values of energy resolution and MCNPX simulations have provided suggestions for further analysis.
Characterization of ANITA and QMN Neutron Beams at TSL Using Proton Recoil Techniques
Y. Naitou,Y. Watanabe,S. Hirayama,M. Hayashi,A. Prokofiev,A. Hjalmarsson,S. Pomp,P. Andersson,R. Bevilacqua,C. Gustavsson,M. Osterlund,V. Simutkin,H. Sjostrand,M. Tesinsky,U. Tippawan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron beam characterization measurements have been carried out in both the ANITA and QMN modes using the incident proton beam of 180 MeV at the The Svedverg Laboratory (TSL) in Uppsala. The spectral neutron flux data have been obtained by measuring elastic np-scattering with the Medley setup. The experimental results in the ANITA and QMN modes are compared with an MCNPX simulation and with the systematics of QMN spectra, respectively.