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10 results on '"J. B. Roberto"'

1. Discovery of elements 113 - 118

Author

V. Utyonkov, Yu. Ts. Oganessian, S. N. Dmitriev, M. G. Itkis, K. J. Moody, M. Stoyer, D. Shaughnessy, J. B. Roberto, K. Rykaczewski, and J. H. Hamilton

Subjects
Physics, QC1-999
Abstract

Review of discovery and investigation of isotopes of elements 113-118 produced in the reactions of48Ca with target nuclei238U-249Cf is presented. The synthesis of the heaviest nuclei, their summary decay properties, and methods of identification are discussed. The radioactive properties of the new nuclei give evidence of the significant increase of the stability of the heavy nuclei with rise of their neutron number and approaching magic number N=184.

Published
2021
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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. Discovery of element 117: Super-heavy elements and the 'island of stability'*

Author

K. P. Rykaczewski and J. B. Roberto

Subjects
010308 nuclear & particles physics, Process Chemistry and Technology, General Chemical Engineering, chemistry.chemical_element, Transactinide element, Mineralogy, Filtration and Separation, General Chemistry, Actinide, Oak Ridge National Laboratory, 01 natural sciences, Island of stability, Nuclear physics, Berkelium, chemistry, 0103 physical sciences, 010306 general physics, Joint (geology)
Abstract

Element 117 (tennessine) joined the periodic table in November 2016. Two tennessine isotopes were synthesized by bombarding 249Bk from Oak Ridge National Laboratory with 48Ca ions at the Joint Inst...

Published
2017
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6. Production and decay of the heaviest nuclei (293,294)117 and (294)118

Author

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

Abstract

Two years after the discovery of element 117, we undertook a second campaign using the (249)Bk+(48)Ca reaction for further investigations of the production and decay properties of the isotopes of element 117 on a larger number of events. The experiments were started in the end of April 2012 and are still under way. This Letter presents the results obtained in 1200 hours of an experimental run with the beam dose of (48)Ca of about 1.5×10(19) particles. The (249)Bk target was irradiated at two energies of (48)Ca that correspond to the maximum probability of the reaction channels with evaporation of three and four neutrons from the excited (297)117. In this experiment, two decay chains of (294)117 (3n) and five decay chains of (293)117 (4n) were detected. In the course of the long-term work, (249)Cf-the product of decay of (249)Bk (330 d)-is being accumulated in the target. Consequently, in the present experiment, we also detected a single decay of the known isotope (294)118 that was produced during 2002-2005 in the reaction (249)Cf((48)Ca,3n)(294)118. The obtained results are compared with the data from previous experiments. The experiments are carried out in the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, using the heavy-ion cyclotron U400.

Published
2012

7. New insights into the 243Am + 48Ca reaction products previously observed in the experiments on elements 113, 115, and 117

Author

Yu Ts, Oganessian, F Sh, Abdullin, S N, Dmitriev, J M, Gostic, J H, Hamilton, R A, Henderson, M G, Itkis, K J, Moody, A N, Polyakov, A V, Ramayya, J B, Roberto, K P, Rykaczewski, R N, Sagaidak, D A, Shaughnessy, I V, Shirokovsky, M A, Stoyer, V G, Subbotin, A M, Sukhov, Yu S, Tsyganov, V K, Utyonkov, A A, Voinov, and G K, Vostokin

Abstract

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.

Published
2011

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