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11.
E. Vardaci A. Di Nitto A. Brondi G. La Rana R. Moro P. N. Nadotchy M. Trotta A. Ordine A. Boiano M. Cinausero E. Fioretto G. Prete V. Rizzi D. Shetty M. Barbui D. Fabris M. Lunardon G. Montagnoli S. Moretto G. Viesti N. Gelli F. Lucarelli G. N. Knyazheva E. M. Kozulin 《The European Physical Journal A - Hadrons and Nuclei》2010,43(2):127-130
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K. B. Gikal E. M. Kozulin A. A. Bogachev N. T. Burtebaev A. V. Edomskiy I. M. Itkis M. G. Itkis G. N. Knyazhev K. V. Kovalchuk T. N. Kvochkina E. Piasecki V. A. Rubchenya S. K. Sahiev W. H. Trzaska E. Vardaci 《Physics of Atomic Nuclei》2016,79(9-10):1367-1374
The mass-energy distributions and cross sections of proton-induced fission of 232Th have been measured at the proton energies of 7, 10, 13, 20, 40, and 55 MeV. Experiments were carried out at the proton beam of the K-130 cyclotron of the JYFL Accelerator Laboratory of the University of Jyväskylä and U-150m cyclotron of the Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan. The yields of fission fragments in the mass range A = 60–170 a.m.u. have been measured up to the level of 10?4%. The three humped shape of the mass distribution up has been observed at higher proton energies. The contribution of the symmetric component grows up with increasing proton incident energy; although even at 55 MeV of proton energy the shoulders in the mass energy distribution clearly indicate the asymmetric fission peaks. Evolution of shell structure was observed in the fission fragment mass distributions even at high excitation energy. 相似文献
14.
The gas-liquid upward flow was studied in a rectangular minichannel of 1.75×3.8 mm and length of 0.7 m. The experiments were
carried out within the range of the gas superficial velocity from 0.1 to 10 m/s and the liquid superficial velocity from 0.07
to 0.7 m/s for the co-current H2O/CO2 flow under the conditions of saturation. The method for the two-beam laser scanning of structure and determination of statistic
characteristics of the two-phase flow was worked through. The slug-bubble, slug, transitional, churn, and annular flows were
distinguished. The statistics characteristics of liquid and gas phases motion in a minichannel were obtained for the first
time including the velocities of phase motion. 相似文献
15.
KM Clauwaert Van Bocxlaer JF HJ Major JA Claereboudt WE Lambert Van den Eeckhout EM Van Peteghem CH De Leenheer AP 《Rapid communications in mass spectrometry : RCM》1999,13(14):1540-1545
This paper describes the investigation of the potential of a quadrupole orthogonal acceleration time-of-flight mass spectrometer (Q-TOF) equipped with an atmospheric pressure ionisation interface for quantitative measurements of small molecules separated by reversed phase liquid chromatography. To this end, the detection limits and linear dynamic range in particular were studied in an LC/MS/MS experiment using 3,4-methylenedioxymethamphetamine standards and 3,4-methylenedioxyethylamphetamine for internal standardisation. In a second phase, the experiment was repeated with real biological extracts (whole blood, serum, and vitreous humour). A calibration for 3,4-methylenedioxymethamphetamine and its metabolite 3,4-methylenedioxyamphetamine was prepared in each of these matrices again using 3,4-methylenedioxyethylamphetamine as internal standard. The resulting quantitative data were compared with those obtained by liquid chromatography with fluorescence detection for the same extracts. The Q-TOF results revealed excellent sensitivity and a linear dynamic range of nearly four decades (2-10 000 pg on-column, r(2) = 0.9998, 1/x weighting). Furthermore, all the calibration curves prepared in biological material were superimposable, LC/MS/MS and LC-fluorescence, and the quantitative results for actual samples compared very favourably. It was concluded that the Q-TOF achieves a linear dynamic range for quantitative LC/MS/MS work exceeding that of fluorescence detection and at much better absolute sensitivity. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
16.
D. Ackermann S. Antalic M. Axiotis D. Bazzacco S. Beghini G. Berek L. Corradi G. De Angelis E. Farnea A. Gadea F. P. Heßberger S. Hofmann M. G. Itkis G. N. Kniajeva E. M. Kozulin A. Latina T. Martinez R. Menegazzo G. Montagnoli G. Münzenberg Yu. Ts. Oganessian C. Rossi-Alvarez M. Ruan R. N. Sagaidak F. Scarlassara A. M. Stefanini S. Szilner M. Trotta C. Ur 《The European Physical Journal A - Hadrons and Nuclei》2003,20(1):151-152
To study basic properties of the fusion reaction dynamics for heavy compound systems the partial-wave distribution
can be employed as an alternative to the classically used fusion/fission excitation functions. A variety of reactions leading to compound nuclei (CN) in the Pb region can be used to investigate features like the fusion-fission competition, the role of deformation in the fusion of heavy systems and a possible effect of the Z = 82 shell on the enhancement of evaporation residue (ER) production.Received: 5 November 2002, Revised: 26 March 2003, Published online: 9 March 2004PACS:
24.75. + i General properties of fission - 25.70.Gh Compound nucleus - 25.70.Jj Fusion and fusion-fission reactions 相似文献
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M. G. Itkis S. Beghini A. A. Bogatchev L. Corradi O. Dorvaux A. Gadea G. Giardina A. A. Goverdovski F. Hanappe I. M. Itkis M. Jandel J. Kliman G. N. Kniajeva N. A. Kondratiev I. V. Korzyukov E. M. Kozulin L. Krupa L. Latina T. Materna G. Montagnoli K. J. Moody Yu. Ts. Oganessian I. V. Pokrovsky V. A. Ponomarenko E. V. Prokhorova N. Rowley A. Ya. Rusanov F. Scarlassara A. M. Stefanini L. Stuttgé S. Szilner M. Trotta A. M. Vinodkumar V. M. Voskressensky 《Physics of Atomic Nuclei》2003,66(6):1118-1124
The process of fusion-fission of heavy and superheavy nuclei (SHE) with Z=82–122 formed in the reactions with 48Ca and 58Fe ions at energies near and below the Coulomb barrier has been studied. The experiments were carried out at the U-400 accelerator of the Flerov Laboratory of Nuclear Reactions (JINR) and at the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL) using the time-of-flight spectrometer of fission fragments CORSET and the neutron multidetector DEMON. As a result of the experiments, mass and energy distributions (MED) of fission fragments; fission, quasifission, and evaporation residue cross sections; and multiplicities of neutrons and γ-quanta and their dependences on the mechanism of formation and decay of compound systems have been studied. 相似文献
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T. Materna C. Schmitt Y. Aritomo J. Bartel B. Benoit A. A. Bogatchev E. de Goès Brennand O. Dorvaux G. Giardina F. Hanappe M. G. Itkis I. M. Itkis J. Kliman G. N. Kniajeva N. A. Kondratiev E. M. Kozulin L. Krupa Yu. Ts. Oganessian I. V. Pokrovsky E. V. Prokhorova N. Rowley K. Siwek-Wilczynska L. Stuttgé 《Physics of Atomic Nuclei》2003,66(6):1168-1172
Nuclear dissipation in capture reactions is investigated using backtracing, a new analysis protocol. Combining analysis procedure with dynamical models, the difficult and long-standing problem of competition and mixing between quasifission and fusion-fission is solved for the first time. The nature of the relevant dissipation is determined as one-body dissipation. At low excitation energy where shell effects are strongly effective, the shape of the mass distribution could be a powerful check of the nature and the magnitude of the dissipation. 相似文献