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I. V. Ryzhov,G. A. Tutin,V. D. Simutkin,J. Blomgren,S. Pomp,M. Osterlund,P. Andersson,R. Bevilacqua,M. S. Onegin,L. A. Vaishnene,J. P. Meulders,R. Prieels 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Incineration of spent nuclear fuel in Accelerator Driven Systems requires nuclear data on neutron-induced fission of actinides at energies above 20 MeV - the upper limit of conventional evaluated nuclear data files. Over the past years, a significant effort has been devoted to measurements of neutron-induced fission cross-sections at intermediate energies but there is a lack of experimental data on fission yields. Here we describe recent measurements of pre-neutron emission fragment mass distributions from intermediate energy neutron-induced fission of <sup>232</sup>Th and <sup>238</sup>U. The measurements have been carried out at the neutron beam of the Louvain-la-Neuve cyclotron facility CYCLONE. Quasi-monoenergetic neutrons with peak energies at 32.8, 45.3 and 59.9 MeV were produced by protons impinging on a thin lithium target. A multi-section Frisch-gridded ionization chamber was used as a fission fragment detector. The measurement results are compared with available experimental data as well as with predictions of the multi-modal random neck-rupture model implemented into the TALYS code.
Microstructure and Magnetic State of Fe₃O₄-SiO₂ Colloidal Particles
P. V. Kharitonskii,K. G. Gareev,S. A. Ionin,V. A. Ryzhov,Yu. V. Bogachev,B. D. Klimenkov,I. E. Kononova,V. A. Moshnikov 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
Colloidal particles consisted of individual nanosized magnetite grains on the surface of the silica cores were obtained by two-stage sol-gel technique. Size distribution and microstructure of the particles were analyzed using atomic force microscopy, X-ray diffraction and Nitrogen thermal desorption. Magnetic properties of the particles were studied by the method of the longitudinal nonlinear response. It has been shown that nanoparticles of magnetite have a size corresponding to a superparamagnetic state but exhibit hysteresis properties. The phenomenon was explained using the magnetostatic interaction model based on the hypothesis of iron oxide particles cluster aggregation on the silica surface.