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51.
A.?A.?Voinov collaboration JINR LLNL ORNL University of Tennessee Vanderbilt University Research Institute of Atomic Reactors 《Physics of Atomic Nuclei》2016,79(13):1519-1524
A survey of experiments at the Dubna gas-filled recoil separator (Laboratory of Nuclear Reactions, JINR, Dubna) aimed at the detection and study of the “island of stability” of superheavy nuclei produced in complete fusion reactions of 48Са ions and 238U–249Cf target nuclei is given. The problems of synthesis of superheavy nuclei, methods for their identification, and investigation of their decay properties, including the results of recent experiments at other separators (SHIP, BGS, TASCA) and chemical setups, are discussed. The studied properties of the new nuclei, the isotopes of elements 112–118, as well as the properties of their decay products, indicate substantial growth of stability of the heaviest nuclei with increasing number of neutrons in the nucleus as the magic number of neutrons N = 184 is approached. 相似文献
52.
V. G. Subbotin A. M. Zubareva A. A. Voinov A. N. Zubarev L. Schlattauer 《Physics of Particles and Nuclei Letters》2016,13(5):557-560
A new series of experiments aimed at the synthesis and study of decay properties of the most neutron-deficient isotopes of element Fl (Z = 114) and of the heaviest isotopes of 118 element is planned at the DGFRS (FLNR JINR). An appropriate registering system is to be implemented to transfer spectrometric data from double-sided silicon strip detector (DSSD). New analog modules were designed that allow to simplify existing multi-channel measurement system and to improve the real-time method of “active correlations” in search for the rare events of SHE formation and decay. The main features of the new modules the 16-channel charge-sensitive preamplifier, the 16-channel analog multiplexer and the 1.25 MSPS 12-bit Parallel ADC are presented. 相似文献
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V. S. Gorelik K. I. Zaitsev V. A. Lazarev S. O. Leonov S. O. Yurchenko Yu. P. Voinov L. I. Zlobina P. P. Sverbil 《Journal of Russian Laser Research》2016,37(3):254-258
We investigate the second harmonic generation under femtosecond pulse-periodic laser radiation in barium titanate in the form of ceramics, in pores of a globular photonic crystal, and in a water colloidal suspension. We measure the dependence of the second harmonic radiation intensity on the incident laser power. Excitation of the second harmonic was carried out by powerful (108 W) pulses of a solid-state Yb:KGW laser (wavelength, 1,026 nm) operating at 200 kHz. We estimate the efficiency of the second harmonic generation in various microstructured phases of barium titanate and show that the threshold of plasma formation in a suspension of barium titanate microparticles in water is substantially higher than in ceramics and in the ferroelectric photonic crystal. The second-harmonicgeneration power can be significantly increased in a water suspension of barium titanate microparticles. 相似文献
55.
Oganessian YTs Abdullin FSh Dmitriev SN Gostic JM Hamilton JH Henderson RA Itkis MG Moody KJ Polyakov AN Ramayya AV Roberto JB Rykaczewski KP Sagaidak RN Shaughnessy DA Shirokovsky IV Stoyer MA Subbotin VG Sukhov AM Tsyganov YS Utyonkov VK Voinov AA Vostokin GK 《Physical review letters》2012,108(2):022502
Results of a new series of experiments on the study of production cross sections and decay properties of the isotopes of element 115 in the reaction (243)Am+(48)Ca are presented. Twenty-one new decay chains originating from (288)115 were established as the product of the 3n-evaporation channel by measuring the excitation function at three excitation energies of the compound nucleus (291)115. The decay properties of all newly observed nuclei are in full agreement with those we measured in 2003. At the lowest excitation energy E*=33 MeV, for the first time we registered the product of the 2n-evaporation channel, (289)115, which was also observed previously in the reaction (249)Bk+(48)Ca as the daughter nucleus of the decay of (293)117. The maximum cross section for the production of (288)115 is found to be 8.5 pb at E*≈36 MeV. 相似文献
56.
V. S. Gorelik Yu. P. Voinov V. D. Zvorykin I. G. Lebo A. O. Levchenko N. N. Ustinovskii 《Bulletin of the Lebedev Physics Institute》2010,37(3):65-70
We present experimental results on the introduction (laser implantation) of ferroelectric NaNO2 into artificial opal pores upon exposure of a thin powder layer of sodium nitrite applied on the artificial opal surface
to radiation of the ultraviolet excimer laser. Reflection spectra of broadband radiation from the laser-implanted sample surface
are compared with the reflection spectra of pure initial opals, artificial opals impregnated with a saturated aqueous solution
of sodium nitrite and evaporated from solvent, and samples in which NaNO2 was directly introduced in the form of a melt. 相似文献
57.
V. S. Gorelik Yu. P. Voinov V. D. Zvorykin A. I. Lebo I. G. Lebo A. O. Levchenko N. N. Ustinovsky 《Journal of Russian Laser Research》2010,31(1):79-90
We present the experimental results on implantation of NaNO2 ferroelectric into pores of synthetic opal by illuminating with focused ultraviolet excimer-laser radiation of a sodium nitrite
film located on the synthetic-opal surface. The reflection spectra of broadband radiation from the surface of implanted specimens
are compared with the reflection spectra of initial (without any treatment) opals, synthetic opals filled with a saturated
aqueous solution of sodium nitrite with subsequently evaporated solvent, and specimens with NaNO2 embedded as a melt. The possible mechanisms of shifts of reflected- and transmitted-radiation peaks are analyzed. Methods
of implanting materials with high melting points into pores of 3D photonic crystals are proposed. 相似文献
58.
59.
Results of an investigation of the hydrodynamics and the mass exchange on the contact steps with tangential vortex generator at a rectification of the ethanol-water mixture are presented. Dependences for computation of the hydraulic resistance, an interphase surface, and the efficiency were obtained. 相似文献
60.