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18 results on '"V. G. Subbotin"'

1. Flexible algorithms for background suppression in heavy ion induced nuclear reactions

Author

D. Ibadullayev, Yu. S. Tsyganov, A. N. Polyakov, A. A. Voinov, V. G. Subbotin, M. V. Shumeiko, and L. Schlattauer

Subjects
superheavy elements, correlation, strip detector, analog spectrometer, separator, cyclotron, evaporation residue, Physics, QC1-999
Abstract

A new algorithm for the analog spectrometer of the DGFRS-2 setup installed at DC-280 cyclotron is presented. The main goal of application of this algorithm is to search an optimal time correlation recoilalpha parameter directly during the acquisition C++ code execution. A new real-time flexible algorithm in addition to the conventional ER − a algorithm, which has been used for a several years at the DGFRS-1 setup installed at the U-400 FLNR cyclotron, is presented. The main parts of the spectrometer are a 48×128 strip DSSD detector (Double Side Strip Detector) and a low-pressure gaseous detector. They are presented schematically. Nuclear reactions for synthesis of element Z=119 at the DGFRS-2 are under consideration. Some attention is paid to computer simulation of the heavy recoil spectra, taking into account its pulse height defect in silicon. First beam test results are also presented. A new formula for half-life time using recent data for superheavy nuclei is obtained.

Published
2022
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2. New isotope Mc286 produced in the Am243+Ca48 reaction

Author

Yu. Ts. Oganessian, V. K. Utyonkov, N. D. Kovrizhnykh, F. Sh. Abdullin, S. N. Dmitriev, A. A. Dzhioev, D. Ibadullayev, M. G. Itkis, A. V. Karpov, D. A. Kuznetsov, O. V. Petrushkin, A. V. Podshibiakin, A. N. Polyakov, A. G. Popeko, I. S. Rogov, R. N. Sagaidak, L. Schlattauer, V. D. Shubin, M. V. Shumeiko, D. I. Solovyev, Yu. S. Tsyganov, A. A. Voinov, V. G. Subbotin, A. Yu. Bodrov, A. V. Sabel'nikov, A. V. Khalkin, K. P. Rykaczewski, T. T. King, J. B. Roberto, N. T. Brewer, R. K. Grzywacz, Z. G. Gan, Z. Y. Zhang, M. H. Huang, and H. B. Yang

Published
2022
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3. First experiment at the Super Heavy Element Factory: High cross section of Mc288 in the Am243+Ca48 reaction and identification of the new isotope Lr264

Author

Yu. Ts. Oganessian, V. K. Utyonkov, N. D. Kovrizhnykh, F. Sh. Abdullin, S. N. Dmitriev, D. Ibadullayev, M. G. Itkis, D. A. Kuznetsov, O. V. Petrushkin, A. V. Podshibiakin, A. N. Polyakov, A. G. Popeko, R. N. Sagaidak, L. Schlattauer, I. V. Shirokovski, V. D. Shubin, M. V. Shumeiko, D. I. Solovyev, Yu. S. Tsyganov, A. A. Voinov, V. G. Subbotin, A. Yu. Bodrov, A. V. Sabel'nikov, A. V. Khalkin, V. B. Zlokazov, K. P. Rykaczewski, T. T. King, J. B. Roberto, N. T. Brewer, R. K. Grzywacz, Z. G. Gan, Z. Y. Zhang, M. H. Huang, and H. B. Yang

Published
2022
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4. Investigation of Ca48 -induced reactions with Pu242 and U238 targets at the JINR Superheavy Element Factory

Author

Yu. Ts. Oganessian, V. K. Utyonkov, D. Ibadullayev, F. Sh. Abdullin, S. N. Dmitriev, M. G. Itkis, A. V. Karpov, N. D. Kovrizhnykh, D. A. Kuznetsov, O. V. Petrushkin, A. V. Podshibiakin, A. N. Polyakov, A. G. Popeko, R. N. Sagaidak, L. Schlattauer, V. D. Shubin, M. V. Shumeiko, D. I. Solovyev, Yu. S. Tsyganov, A. A. Voinov, V. G. Subbotin, A. Yu. Bodrov, A. V. Sabel'nikov, A. Lindner, K. P. Rykaczewski, T. T. King, J. B. Roberto, N. T. Brewer, R. K. Grzywacz, Z. G. Gan, Z. Y. Zhang, M. H. Huang, and H. B. Yang

Published
2022
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5. Synthesizing and Studying Superheavy Nuclei 294Ts and 294Og

Author

V. K. Utyonkov, F. Sh. Abdullin, V. G. Subbotin, R. N. Sagaidak, M. G. Itkis, M. V. Shumeiko, I. V. Shirokovsky, Yu. Ts. Oganessian, A. N. Polyakov, A. V. Sabelnikov, Yu. S. Tsyganov, N. D. Kovrizhnykh, Grigory K. Vostokin, A. A. Voinov, and S. N. Dmitriev

Subjects
010302 applied physics, Physics, Nuclear physics, Isotope, 010308 nuclear & particles physics, 0103 physical sciences, Hadron, General Physics and Astronomy, Nuclide, 01 natural sciences, Recoil separator, Radioactive decay
Abstract

Experimental works performed on the Dubna gas-filled magnetic recoil separator (GFS) to study the reactions of formation of 294Ts and 294Og nuclides and the properties of their radioactive decay are described. Future possibilities of synthesizing new elements with Z = 119 and Z = 120 and performing experiments to study the properties of heavier isotopes of known superheavy nuclei Lv (Z = 116), Ts (Z = 117), and Og (Z = 118) are discussed.

Published
2020
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6. Study of Neutron-Deficient Nuclei in the 239,240Pu+48Ca Reactions

Author

F. Sh. Abdullin, K. P. Rykaczewski, Robert Grzywacz, J. H. Hamilton, A. I. Svirikhin, A. A. Voinov, Zibao Gan, N. T. Brewer, Yu. Ts. Oganessian, M. V. Shumeiko, I. V. Shirokovsky, R. N. Sagaidak, A. G. Popeko, Lanqing Ma, A. M. Sukhov, V. G. Subbotin, James B. Roberto, A. V. Karpov, Yu. S. Tsyganov, V. K. Utyonkov, M. G. Itkis, K. Miernik, A. N. Polyakov, A. V. Sabelnikov, M. A. Stoyer, L. Schlattauer, S. N. Dmitriev, N. D. Kovrizhnykh, W. Huang, and Grigory K. Vostokin

Subjects
Materials science, Radiochemistry, Neutron
Published
2019
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7. Experimental Study of the 249-251Cf + 48Ca Reactions: Toward the Magic Neutron Number N=184

Author

S. M. Van Cleve, M. G. Itkis, Grigory K. Vostokin, S. N. Dmitriev, Robert Grzywacz, D. C. McInturff, G. D. Owen, M. A. Stoyer, A. G. Popeko, James B. Roberto, A. I. Svirikhin, V. G. Subbotin, E. H. Smith, Rose A. Boll, R. N. Sagaidak, C. S. White, Yu. Ts. Oganessian, A. M. Sukhov, A. A. Voinov, N. T. Brewer, K. Miernik, A. N. Polyakov, K. P. Rykaczewski, Julie G. Ezold, J. H. Hamilton, Nathan J. Sims, N. D. Kovrizhnykh, D. J. Dean, V. K. Utyonkov, L. K. Felker, M. V. Shumeiko, Yu. S. Tsyganov, F. Sh. Abdullin, A. V. Sabelnikov, and I. V. Shirokovsky

Subjects
Physics, Nuclear physics, Neutron number, Magic (programming)
Published
2019
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8. New analog electronics for the new challenges in the synthesis of superheavy elements

Author

A. A. Voinov, A. M. Zubareva, A. N. Zubarev, L. Schlattauer, and V. G. Subbotin

Subjects
Physics, Nuclear and High Energy Physics, Radiation, Analogue electronics, 010308 nuclear & particles physics, Preamplifier, System of measurement, Detector, Superheavy Elements, 01 natural sciences, Multiplexer, Atomic and Molecular Physics, and Optics, 0103 physical sciences, Electronic engineering, Radiology, Nuclear Medicine and imaging, 010306 general physics
Abstract

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.

Published
2016
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9. Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Author

Robert Grzywacz, I. V. Shirokovsky, A. V. Sabelnikov, M. G. Itkis, A. A. Voinov, S. N. Dmitriev, N. T. Brewer, K. Miernik, F. Sh. Abdullin, A. N. Polyakov, Nathan J. Sims, K. P. Rykaczewski, Julie G. Ezold, S. M. Van Cleve, J. H. Hamilton, G. D. Owen, R. N. Sagaidak, M. V. Shumeiko, A. I. Svirikhin, A. M. Sukhov, E. H. Smith, L. K. Felker, N. D. Kovrizhnykh, V. G. Subbotin, Rose A. Boll, A. G. Popeko, Yu. S. Tsyganov, D. J. Dean, V. K. Utyonkov, C. S. White, Yu. Ts. Oganessian, James B. Roberto, M. A. Stoyer, Grigory K. Vostokin, and D. C. McInturff

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Californium, 01 natural sciences, Recoil separator, Nuclear physics, chemistry, 0103 physical sciences, Atomic nucleus, Irradiation, Decay chain, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

The search for new decay chains of oganesson isotopes is presented. The experiment utilized the Dubna Gas Filled Recoil Separator and a highly segmented recoil-decay detection system. The signals from all detectors were analyzed in parallel by digital and analog data acquisition systems. For the first time, a target of mixed californium (51% Cf249, 13% Cf250, and 36% Cf251) recovered from decayed Cf252 sources was produced and irradiated with an intense Ca48 beam. The observation of a new decay chain of Og294 is reported. The prospects for reaching new isotopes Og295,296 are discussed.

Published
2018
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10. Neutron-deficient superheavy nuclei obtained in the Pu240+Ca48 reaction

Author

F. Sh. Abdullin, Lanqing Ma, Grigory K. Vostokin, R. N. Sagaidak, S. N. Dmitriev, A. I. Svirikhin, K. P. Rykaczewski, A. M. Sukhov, M. A. Stoyer, M. V. Shumeiko, L. Schlattauer, Robert Grzywacz, J. H. Hamilton, Yu. S. Tsyganov, A. V. Sabelnikov, A. V. Karpov, Zibao Gan, I. V. Shirokovsky, V. K. Utyonkov, K. Miernik, A. G. Popeko, A. N. Polyakov, M. G. Itkis, A. A. Voinov, V. G. Subbotin, N. T. Brewer, N. D. Kovrizhnykh, Yu. Ts. Oganessian, Wenxue Huang, and James B. Roberto

Subjects
Physics, Nuclear physics, 010308 nuclear & particles physics, 0103 physical sciences, Neutron, 010306 general physics, 01 natural sciences
Published
2018
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11. EXPERIMENTS ON SYNTHESIS OF SUPERHEAVY NUCLEI 284Fl AND 285Fl IN THE 239,240Pu + 48Ca REACTIONS

Author

Robert Grzywacz, V. K. Utyonkov, K. Miernik, A. N. Polyakov, Grigory K. Vostokin, K. P. Rykaczewski, M. G. Itkis, V. G. Subbotin, A. A. Voinov, N. T. Brewer, J. H. Hamilton, M. A. Stoyer, Yu. S. Tsyganov, James B. Roberto, M. V. Shumeiko, I. V. Shirokovsky, F. Sh. Abdullin, S. Y. Strauss, S. N. Dmitriev, A. V. Sabelnikov, Yu. Ts. Oganessian, R. N. Sagaidak, and A. M. Sukhov

Published
2017
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12. RESULTS FROM THE RECENT STUDY OF THE 249-251Cf + 48Ca REACTIONS

Author

Grigory K. Vostokin, M. G. Itkis, James B. Roberto, R. N. Sagaidak, A. M. Sukhov, V. G. Subbotin, K. P. Rykaczewski, M. V. Shumeiko, Yu. Ts. Oganessian, A. V. Sabelnikov, J. H. Hamilton, A. A. Voinov, K. Miernik, F. Sh. Abdullin, N. T. Brewer, A. N. Polyakov, Robert Grzywacz, M. A. Stoyer, Yu. S. Tsyganov, V. K. Utyonkov, I. V. Shirokovsky, and S. N. Dmitriev

Published
2017
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13. Study of the 249-251Cf + 48Ca reactions: recent results and outlook

Author

Robert Grzywacz, F. Sh. Abdullin, Yu. S. Tsyganov, Yu. Ts. Oganessian, Grigory K. Vostokin, S. N. Dmitriev, K. Miernik, A. N. Polyakov, R. N. Sagaidak, A. A. Voinov, A. V. Sabelnikov, A. M. Sukhov, N. T. Brewer, M. V. Shumeiko, V. G. Subbotin, I. V. Shirokovsky, James B. Roberto, V. K. Utyonkov, K. P. Rykaczewski, J. H. Hamilton, M. A. Stoyer, and M. G. Itkis

Subjects
Physics, History, Computer Science Applications, Education
Published
2018
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14. Experiments on the synthesis of superheavy nucleiFl284andFl285in thePu239,240+Ca48reactions

Author

Robert Grzywacz, James B. Roberto, A. A. Voinov, Grigory K. Vostokin, V. G. Subbotin, N. T. Brewer, M. V. Shumeiko, A. V. Sabelnikov, R. N. Sagaidak, Yu. S. Tsyganov, Yuri Oganessian, V. K. Utyonkov, A. M. Sukhov, I. V. Shirokovsky, F. Sh. Abdullin, S. Y. Strauss, K. Miernik, A. N. Polyakov, K. P. Rykaczewski, J. H. Hamilton, S. N. Dmitriev, M. A. Stoyer, and M. G. Itkis

Subjects
Physics, Nuclear and High Energy Physics, Order (ring theory), chemistry.chemical_element, Flerovium, chemistry, Neutron number, Production (computer science), Decay chain, Alpha decay, Atomic physics, Nuclear Experiment, Energy (signal processing), Spontaneous fission
Abstract

Irradiations of $^{239}\mathrm{Pu}$ and $^{240}\mathrm{Pu}$ targets with $^{48}\mathrm{Ca}$ beams aimed at the synthesis of $Z=114$ flerovium isotopes were performed at the Dubna Gas Filled Recoil Separator. A new spontaneously fissioning (SF) isotope $^{284}\mathrm{Fl}$ was produced for the first time in the $^{240}\mathrm{Pu}+^{48}\mathrm{Ca}$ (250 MeV) and $^{239}\mathrm{Pu}+^{48}\mathrm{Ca}$ (245 MeV) reactions. The cross section of the $^{239}\mathrm{Pu}(^{48}\mathrm{Ca},3n)^{284}\mathrm{Fl}$ reaction channel was about 20 times lower than predicted by theoretical models and about 50 times lower than the maximum fusion-evaporation cross section for the $3n$ and $4n$ channels measured in the $^{244}\mathrm{Pu}+^{48}\mathrm{Ca}$ reaction. In the $^{240}\mathrm{Pu}+^{48}\mathrm{Ca}$ experiment, performed at 245 MeV in order to maximize the $3n$-evaporation channel, three decay chains of $^{285}\mathrm{Fl}$ were detected. The $\ensuremath{\alpha}$-decay energy of $^{285}\mathrm{Fl}$ was measured for the first time and decay properties of its descendants $^{281}\mathrm{Cn}, ^{277}\mathrm{Ds}, ^{273}\mathrm{Hs}, ^{269}\mathrm{Sg}$, and $^{265}\mathrm{Rf}$ were determined with higher accuracy. The assignment of SF events observed during the irradiation of the $^{240}\mathrm{Pu}$ target with a 250 MeV $^{48}\mathrm{Ca}$ beam to $^{284}\mathrm{Fl}$ decay is presented and discussed. The cross sections at both $^{48}\mathrm{Ca}$ energies are similar and exceed that observed in the reaction with the lighter isotope $^{239}\mathrm{Pu}$ by a factor of 10. The decay properties of the synthesized nuclei and their production cross sections indicate a rapid decrease of stability of superheavy nuclei as the neutron number decreases from the predicted magic neutron number $N=184$.

Published
2015
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15. Connecting the 'Hot Fusion Island' to the Nuclear Mainland: Search for 283,284,285Fl Decay Chains

Author

Yu. Ts. Oganessian, A. A. Voinov, N. T. Brewer, F. Sh. Abdullin, Yu. S. Tsyganov, M. V. Shumeiko, K. P. Rykaczewski, Grigory K. Vostokin, A. V. Sabelnikov, James B. Roberto, V. K. Utyonkov, R. N. Sagaidak, V. G. Subbotin, I. V. Shirokovsky, A. M. Sukhov, J. H. Hamilton, Robert Grzywacz, Roger Henderson, K. Miernik, A. N. Polyakov, M. A. Stoyer, M. G. Itkis, and S. N. Dmitriev

Subjects
Nuclear physics, Physics, Fusion, Oceanography, Mainland, Decay chain
Published
2015
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16. Production and decay of the heaviest odd-Z nuclei in the249Bk +48Ca reaction

Author

A. V. Ramayya, Kenton J. Moody, D. A. Shaughnessy, J. M. Gostic, Rose A. Boll, A. A. Voinov, R. N. Sagaidak, M. A. Stoyer, A. M. Sukhov, K. P. Rykaczewski, Julie G. Ezold, Yu. Ts. Oganessian, J. H. Hamilton, M. A. Ryabinin, F. Sh. Abdullin, M. G. Itkis, J. Binder, C.W. Alexander, Yu. S. Tsyganov, K. Miernik, A. N. Polyakov, Robert Grzywacz, I. V. Shirokovsky, K. Felker, N. J. Stoyer, Roger Henderson, V. G. Subbotin, V. K. Utyonkov, David Miller, M. V. Shumeiko, James B. Roberto, Grigory K. Vostokin, and S. N. Dmitriev

Subjects
History, Decay scheme, Isotope, Chemistry, Isotopes of zirconium, Nuclide, Decay chain, Atomic physics, s-process, Beta-decay stable isobars, Magic number (physics), Computer Science Applications, Education
Abstract

The reaction of 249Bk with 48Ca has been investigated with an aim of synthesizing and studying the decay properties of isotopes of the new element 117. The experiments were performed at five projectile energies (in two runs, in 2009-2010 and 2012) and with a total beam dose of 48Ca ions of about 9x1019 The experiments yielded data on a-decay characteristics and excitation functions of the produced nuclei that establish these to be 293117 and 294117 – the products of the 4n- and 3n-evaporation channels, respectively. In total, we have observed 20 decay chains of Z=117 nuclides. The cross sections were measured to be 1.1 pb for the 3n and 2.4 pb for the 4n-reaction channel. The new 289115 events, populated by α decay of 117, demonstrate the same decay properties as those observed for 115 produced in the 243Am(48Ca,2n) reaction thus providing cross-bombardment evidence. In addition, a single decay of 294118 was observed from the reaction with 249Cf – a result of the in-growth of 249Cf in the 249Bk target. The observed decay chain of 294118 is in good agreement with decay properties obtained in 2002-2005 in the experiments with the reaction 249Cf(48Ca,3n)294118. The energies and half-lives of the odd-Z isotopes observed in the 117 decay chains together with the results obtained for lower-Z superheavy nuclei demonstrate enhancement of nuclear stability with increasing neutron number towards the predicted new magic number N=184.

Published
2015
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