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1. Study of the 242Pu + 48Ca Reaction at Super Heavy Element Factory

Author

Ibadullayev, D., Utyonkov, V. K., Oganessian, Yu. Ts., Abdullin, F. Sh., Dmitriev, S. N., Itkis, M. G., Karpov, A. V., Kovrizhnykh, N. D., Kuznetsov, D. A., Petrushkin, O. V., Podshibiakin, A. V., Polyakov, A. N., Popeko, A. G., Sagaidak, R. N., Schlattauer, L., Shubin, V. D., Shumeiko, M. V., Solovyev, D. I., Tsyganov, Yu. S., Voinov, A. A., Subbotin, V. G., Bodrov, A. Yu., Sabel’nikov, A. V., Giniyatova, Sh. G., and Kuterbekov, K. A.

Published
2023
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2. First Experiment at the Super Heavy Element Factory: New Data from the 243Am + 48Ca Reaction

Author

Kovrizhnykh, N. D., Oganessian, Yu. Ts., Utyonkov, V. K., Abdullin, F. Sh., Dmitriev, S. N., Dzhioev, A. A., Ibadullayev, D., Itkis, M. G., Karpov, A. V., Kuznetsov, D. A., Petrushkin, O. V., Podshibiakin, A. V., Polyakov, A. N., Popeko, A. G., Rogov, I. S., Sagaidak, R. N., Schlattauer, L., Shubin, V. D., Shumeiko, M. V., Solovyev, D. I., Tsyganov, Yu. S., Voinov, A. A., Subbotin, V. G., Bodrov, A. Yu., Sabel’nikov, A. V., and Khalkin, A. V.

Published
2023
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4. Erratum to: Study of the 242Pu + 48Ca Reaction at Super Heavy Element Factory

Author

Ibadullayev, D., Utyonkov, V. K., Oganessian, Yu. Ts., Abdullin, F. Sh., Dmitriev, S. N., Itkis, M. G., Karpov, A. V., Kovrizhnykh, N. D., Kuznetsov, D. A., Petrushkin, O. V., Podshibiakin, A. V., Polyakov, A. N., Popeko, A. G., Sagaidak, R. N., Schlattauer, L., Shubin, V. D., Shumeiko, M. V., Solovyev, D. I., Tsyganov, Yu. S., Voinov, A. A., Subbotin, V. G., Bodrov, A. Yu., Sabel’nikov, A. V., Giniyatova, Sh. G., and Kuterbekov, K. A.

Published
2024
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8. Erratum to: Study of Binary Processes in the Reactions of 36Ar + 144, 154Sm and 68Zn + 112Sn Leading to the Formation of Neutron-Deficient Compound 180, 190Hg Nuclei

Author

Bogachev, A. A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Banerjee, T., Cheralu, M., Itkis, M. G., Mukhamejanov, Y., Kumar, D., Pan, A., Pchelintsev, I. V., Vorob’ev, I. V., Trzaska, W. H., Vardaci, E., di Nitto, A., Khlebnikov, S. V., Harka, I., and Andreyev, A.

Published
2022
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10. Formation and Decay of the Composite System Z = 120 in Reactions with Heavy Ions at Energies Near the Coulomb Barrier

Author

Novikov, K. V., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Karpov, A. V., Itkis, M. G., Diatlov, I. N., Cheralu, M., Gall, B., Asfari, Z., Kozulina, N. I., Kumar, D., Pchelintsev, I. V., Loginov, V. N., Bondarchenko, A. E., Singh, P. P., Vorobiev, I. V., Heinz, S., Trzaska, W. H., Vardaci, E., Tortorelli, N., Borcea, C., and Harca, I.

Published
2020
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11. Synthesizing and Studying Superheavy Nuclei 294Ts and 294Og

Author

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

Published
2020
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12. Start-Up of the DC-280 Cyclotron, the Basic Facility of the Factory of Superheavy Elements of the Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research

Author

Gulbekian, G. G., Dmitriev, S. N., Itkis, M. G., Oganessyan, Yu. Ts., Gikal, B. N., Kalagin, I. V., Semin, V. A., Bogomolov, S. L., Buzmakov, V. A., Ivanenko, I. A., Kazarinov, N. Yu., Osipov, N. F., Pashenko, S. V., Sokolov, V. A., Pchelkin, N. N., Prokhorov, S. V., Khabarov, M. V., and Gikal, K. B.

Published
2019
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15. Study of the 242Pu + 48Ca Reaction at Super Heavy Element Factory.

Author

Ibadullayev, D., Utyonkov, V. K., Oganessian, Yu. Ts., Abdullin, F. Sh., Dmitriev, S. N., Itkis, M. G., Karpov, A. V., Kovrizhnykh, N. D., Kuznetsov, D. A., Petrushkin, O. V., Podshibiakin, A. V., Polyakov, A. N., Popeko, A. G., Sagaidak, R. N., Schlattauer, L., Shubin, V. D., Shumeiko, M. V., Solovyev, D. I., Tsyganov, Yu. S., and Voinov, A. A.

Abstract

Experiments on the synthesis of isotopes of element 114 in the 242Pu + 48Ca reaction were carried out at a new gas-filled separator DGFRS-2 online to the DC-280 cyclotron of the Superheavy Element Factory at the Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research. The decay properties of 286Fl and 287Fl, as well as their α-decay products, were refined. The possibility of the existence of isomeric states in successive α-decays of 287Fl is discussed. The maximum cross section of pb was measured for the 242Pu(48Ca, 3n)287Fl reaction. [ABSTRACT FROM AUTHOR]

Published
2023
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16. First Experiment at the Super Heavy Element Factory: New Data from the 243Am + 48Ca Reaction.

Author

Kovrizhnykh, N. D., Oganessian, Yu. Ts., Utyonkov, V. K., Abdullin, F. Sh., Dmitriev, S. N., Dzhioev, A. A., Ibadullayev, D., Itkis, M. G., Karpov, A. V., Kuznetsov, D. A., Petrushkin, O. V., Podshibiakin, A. V., Polyakov, A. N., Popeko, A. G., Rogov, I. S., Sagaidak, R. N., Schlattauer, L., Shubin, V. D., Shumeiko, M. V., and Solovyev, D. I.

Abstract

We presented the results of the series of experiments on the synthesis of Mc isotopes in the 243Am + 48Ca reaction performed at the new separator DGFRS-2 and cyclotron DC280 of the SHE Factory at FLNR JINR. There were registered 110 new 288Mc decay chains, 10 289Mc chains, and 4 287Mc chains. Alpha decay of 268Db with an energy of 7.6–8.0 MeV, half-life h and α-branch % was registered for the first time together with a new spontaneously fissioning isotope 264Lr with a half-life of h The measured cross section of the 243Am(48Ca, 3n)288Mc reaction was pb, which is the largest for known superheavy nuclei. A new isotope 286Mc was synthesized with a half-life of 20 ms and an α-particle energy of 10.71 ± 0.02 MeV. Spontaneous fission of 279Rg was first observed in one of the four new decay chains of 287Mc. The reaction excitation function was measured at six 48Ca energies in the range of 239–259 MeV, which led to the first observation of the 5n channel with a cross section of 0.5 pb. The decay properties of 20 previously known isotopes have been determined with higher accuracy. [ABSTRACT FROM AUTHOR]

Published
2023
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18. Fission of Hg-180,Hg-182,Hg-183* and Pt-178* nuclei at intermediate excitation energies

Author

Kozulin E. M., Knyazheva G. N., Itkis I. M., Itkis M. G., Mukhamejanov Y. S., Bogachev A. A., Novikov K. V., Kirakosyan V. V., Kumar D., Banerjee T., Cheralu M., Maiti M., Prajapat R., Kumar R., Sarkar G., Trzaska W. H., Andreyev A. N., Harca I. M., Mitu A., Vardaci E., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Mukhamejanov, Y. S., Bogachev, A. A., Novikov, K. V., Kirakosyan, V. V., Kumar, D., Banerjee, T., Cheralu, M., Maiti, M., Prajapat, R., Kumar, R., Sarkar, G., Trzaska, W. H., Andreyev, A. N., Harca, I. M., Mitu, A., and Vardaci, E.

Abstract

Background: The nature of asymmetric fission of preactinides is not yet understood in detail, despite intense experimental and theoretical studies carried out at present. Purpose: The study of asymmetric and symmetric fission of Hg180,182,183 and Pt178 nuclei as a function of their excitation energy and isospin. Methods: Mass-energy distributions of fission fragments of Hg180, Pt178 (two protons less than Hg180), and Hg182 (two neutrons more than Hg180) formed in the Ar36+Sm144, Nd142, and Ca40+Nd142 reactions were measured at energies near and above the Coulomb barrier. Fission of Hg183 obtained in the reaction of Ca40 with Nd143 was also investigated to see if one extra neutron could lead to dramatic changes in the fission process due to the shape-staggering effect in radii, known in Hg183. The measurements were performed with the double-arm time-of-flight spectrometer CORSET. Results: The observed peculiarities in the fission fragment mass-energy distributions for all studied nuclei may be explained by the presence of a symmetric fission mode and three asymmetric fission modes, manifested by the different total kinetic energies and fragment mass splits. The yield of symmetric mode grows with increasing excitation energy of compound nucleus. Conclusions: The investigated properties of asymmetric fission of Hg180,182,183 and Pt178 nuclei point out the existence of well-deformed proton shell at Z≈36 and a less deformed proton shell at Z ≈ 46.

Published
2022

19. Fusion hindrance and quasi-fission in 48Ca induced reactions : Implications for super-heavy element production

Author

Trotta, M., Stefanini, A. M., Beghini, S., Behera, B. R., Chizhov, A. Yu., Corradi, L., Courtin, S., Fioretto, E., Gadea, A., Gomes, P. R. S., Haas, F., Itkis, I. M., Itkis, M. G., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Latina, A., Montagnoli, G., Pokrovsky, I. V., Rowley, N., Sagaidak, R. N., Scarlassara, F., Szanto de Toledo, A., Szilner, S., Voskressensky, V. M., Wu, Y. W., Gross, Carl J., editor, Nazarewicz, Witold, editor, and Rykaczewski, Krzysztof P., editor

Published
2005
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21. Asymmetric and symmetric fission of excited nuclei of Hg 180,190 and Pb 184,192,202 formed in the reactions with Ar 36 and Ca 40,48 ions

Author

Bogachev A. A., Kozulin E. M., Knyazheva G. N., Itkis I. M., Itkis M. G., Novikov K. V., Kumar D., Banerjee T., Diatlov I. N., Cheralu M., Kirakosyan V. V., Mukhamejanov Y. S., Pan A. N., Pchelintsev I. V., Tikhomirov R. S., Vorobiev I. V., Maiti M., Prajapat R., Kumar R., Sarkar G., Trzaska W. H., Andreyev A. N., Harca I. M., Vardaci E., Bogachev, A. A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Novikov, K. V., Kumar, D., Banerjee, T., Diatlov, I. N., Cheralu, M., Kirakosyan, V. V., Mukhamejanov, Y. S., Pan, A. N., Pchelintsev, I. V., Tikhomirov, R. S., Vorobiev, I. V., Maiti, M., Prajapat, R., Kumar, R., Sarkar, G., Trzaska, W. H., Andreyev, A. N., Harca, I. M., and Vardaci, E.

Abstract

Background: Observation of asymmetric fission of Hg180 has led to intensive theoretical and experimental studies of fission of neutron-deficient nuclei in the lead region. Purpose: The study of asymmetric and symmetric fission modes of Hg180,190 and Pb184,192,202 nuclei. Methods: Mass-energy distributions of fission fragments of Hg180,190 and Pb184 formed in the Ar36+Sm144,154 and Ca40+Sm144 reactions, respectively, at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET and compared with previously measured Pb192,202 isotopes produced in the Ca48+Sm144,154 reactions. The mass distributions for Hg180,190 and Pb184,192,202 together with old data for Ir187, Au195, Hg198, Tl201, Bi205,207, Po210, and At213 [J. Nucl. Phys. 53, 1225 (1991)] have been decomposed into symmetric and asymmetric fission modes. The total kinetic-energy distributions for different fission fragment mass regions have been analyzed for Hg180,190 and Pb184. Results: The stabilization role of proton numbers at Z≈36, 38, Z≈45, 46, and Z=28/50 in asymmetric fission of excited preactinide nuclei has been observed. The high (≈145-MeV) and the low (≈128-MeV) energy components have been found in the total kinetic-energy distributions of Hg180,190 fission fragments corresponding to the fragments with proton numbers near Z≈46 and Z≈36, respectively. In the case of fission of Pb184 only the low-energy component (≈135MeV) for the fragments with masses corresponding to the proton numbers Z≈36 and 46 has been found. Conclusions: The studied properties of asymmetric fission of Hg180,190 and Pb184,192,202 nuclei point out the existence of well deformed proton shell at Z≈36 and less deformed proton shell at Z≈46.

Published
2021

22. Asymmetric and symmetric fission of excited nuclei of 180,190Hg and 184,192,202Pb formed in the reactions with 36Ar and 40,48Ca ions

Author

Bogachev, A. A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Novikov, K. V., Kumar, D., Banerjee, T., Diatlov, I. N., Cheralu, M., Kirakosyan, V. V., Mukhamejanov, Y. S., Pan, A. N., Pchelintsev, I. V., Tikhomirov, R. S., Vorobiev, I. V., Maiti, M., Prajapat, R., Sarkar, G., Trzaska, W. H., Andreyev, A. N., Harca, I. M., and Vardaci, E.

Published
2021

24. Separation efficiency of the MASHA facility for short-lived mercury isotopes

Author

Rodin, A. M., Belozerov, A. V., Chernysheva, E. V., Dmitriev, S. N., Gulyaev, A. V., Gulyaeva, A. V., Itkis, M. G., Kliman, J., Kondratiev, N. A., Krupa, L., Novoselov, A. S., Oganessian, Yu. Ts., Podshibyakin, A. V., Salamatin, V. S., Siváček, I., Stepantsov, S. V., Vanin, D. V., Vedeneev, V. Yu., Yukhimchuk, S. A., Granja, C., and Pospisil, S.

Published
2014
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30. Investigation of fusion probabilities in the reactions with 52,54Cr, 64Ni, and 68Zn ions leading to the formation of Z = 120 superheavy composite systems

Author

Novikov, K. V., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Bogachev, A. A., Diatlov, I. N., Cheralu, M., Kumar, D., Kozulina, N. I., Pan, A. N., Pchelintsev, I. V., Vorobiev, I. V., Trzaska, W. H., Heinz, S., Devaraja, H. M., Lommel, B., Vardaci, E., Spinosa, S., Di Nitto, A., Pulcini, A., Khlebnikov, S. V., Singh, Pushpendra P., Sahoo, Rudra, N., Gall, B., Asfari, Z., Borcea, C., Harca, I., and Filipescu, D. M.

Subjects
fissio, fuusioreaktio, low and intermediate energy heavy-ion reactions, ydinfysiikka, nuclear fusion
Abstract

Background: The formation of superheavy nuclei in fusion reactions is suppressed by a competing quasifission process. The competition between the formation of the compound nucleus and the quasifission depends strongly on the reaction entrance channel. Purpose: The investigation of fission and quasifission processes in the formation of Z=120 superheavy composite systems in the 52,54Cr+248Cm and 68Zn+232Th reactions, and their comparison with the 64Ni+238U reaction at energies in the vicinity of the Coulomb barrier. Methods: Mass-energy distributions of fissionlike fragments formed in the reactions 52,54Cr+248Cm and 68Zn+232Th at energies near the Coulomb barrier were measured using the double-arm time-of-flight spectrometer CORSET. Results: Capture cross sections for the reactions under investigation were measured. The most probable fragment masses and total kinetic energies as well as their variances in dependence on the interaction energy were studied for asymmetric and symmetric fragments. The fusion probabilities were estimated from the analysis of mass-energy distributions. Conclusions: The estimated fusion probability drops down by a factor of 103 in the 54Cr+248Cm reaction compared to the reactions of 48Ca ions with actinides. Among the studied reactions, the 54Cr+248Cm is the most favorable one for the production of the superheavy element with Z=120. peerReviewed

Published
2020

31. Chemical characterization of element 112

Author

Eichler, R., Aksenov, N. V., Belozerov, A. V., Bozhikov, G. A., Chepigin, V. I., Dmitriev, S. N., Dressler, R., Gaggeler, H. W., Gorshkov, V. A., Haenssler, F., Itkis, M. G., Laube, A., Lebedev, V. Ya., Malyshev, O. N., Oganessian, Yu. Ts., Petrushkin, O. V., Piguet, D., Rasmussen, P., Shishkin, S. V., Shutov, A. V., Svirikhin, A. I., Tereshatov, E. E., Vostokin, G. K., Wegrzecki, M., and Yeremin, A. V.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): R. Eichler (corresponding author) [1, 2]; N. V. Aksenov [3]; A. V. Belozerov [3]; G. A. Bozhikov [3]; V. I. Chepigin [3]; S. N. Dmitriev [3]; R. Dressler [1]; [...]

Published
2007
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32. New elements from Dubna

Author

Oganessian, Yu. Ts., Utyonkov, V. K., Lobanov, Yu. V., Abdullin, F. Sh., Polyakov, A. N., Shirokovsky, I. V., Tsyganov, Yu. S., Gulbekian, G. G., Bogomolov, S. L., Gikal, B. N., Mezentsev, A. N., Iliev, S., Subbotin, V. G., Sukhov, A. M., Voinov, A. A., Buklanov, G. V., Subotic, K., Zagrebaev, V. I., Itkis, M. G., Patin, J. B., Moody, K. J., Wild, J. F., Stoyer, M. A., Stoyer, N. J., Shaughnessy, D. A., Kenneally, J. M., Wilk, P. A., and Lougheed, R. W.

Published
2005
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33. Shell effects in fusion-fission of heavy and superheavy nuclei

Author

Itkis, M. G., Beghini, S., Bogatchev, A. A., Corradi, L., Dorvaux, O., Hanappe, F., Gadea, A., Giardina, G., Itkis, I. M., Jandel, M., Kliman, J., Kniajeya, G. N., Kondratiev, N. A., Korzyukov, I. V., Kozulin, E. M., Krupa, L., Latina, L., Materna, T., Montagnoli, G., Oganessian, Yu. Ts., Pokrovsky, I. V., Prokhorova, E. V., Rowley, N., Rusanov, A. Ya., Scarlassara, F., Stefanini, A. M., Stuttgé, L., Szilner, S., Trotta, M., and Voskressenski, V. M.

Published
2004
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34. Second experiment at VASSILISSA separator on the synthesis of the element 112

Author

Oganessian, Yu Ts, Yeremin, A. V., Popeko, A. G., Malyshev, O. N., Belozerov, A. V., Buklanov, G. V., Chelnokov, M. L., Chepigin, V. I., Gorshkov, V. A., Hofmann, S., Itkis, M. G., Kabachenko, A. P., Kindler, B., Münzenberg, G., Sagaidak, R. N., Šáro, Š, Schött, H.-J., Štreicher, B., Shutov, A. V., Svirikhin, A. I., and Vostokin, G. K.

Published
2004
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35. Tracking dissipation in capture reactions

Author

Materna, T., Schmitt, C., Aritomo, Y., Bartel, J., Benoit, B., Bogatchev, A. A., de Goès Brennand, E., Dorvaux, O., Giardina, G., Hanappe, F., Itkis, M. G., Itkis, I. M., Kliman, J., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Krupa, L., Oganessian, Yu. Ts., Pokrovsky, I. V., Prokhorova, E. V., Rowley, N., Siwek-Wilczynska, K., and Stuttgé, L.

Published
2003
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36. The effect of the entrance channel on the fission of 216Ra

Author

Pokrovsky, I. V., Chizhov, A. Yu., Itkis, M. G., Itkis, I. M., Kniajeva, G. N., Kozulin, E. M., Kondratiev, N. A., Sagaidak, R. N., Voskressensky, V. M., Corradi, L., Stefanini, A. M., Trotta, M., Vinodkumar, A. M., Beghini, S., Montagnoli, G., Scarlassara, F., Rusanov, A. Ya., Hanappe, F., Dorvaux, O., Rowley, N., and Stuttgé, L.

Published
2003
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38. Fusion-fission of heavy and superheavy nuclei

Author

Itkis, M. G., Beghini, S., Bogatchev, A. A., Corradi, L., Dorvaux, O., Gadea, A., Giardina, G., Goverdovski, A. A., Hanappe, F., Itkis, I. M., Jandel, M., Kliman, J., Kniajeva, G. N., Kondratiev, N. A., Korzyukov, I. V., Kozulin, E. M., Krupa, L., Latina, L., Materna, T., Montagnoli, G., Moody, K. J., Oganessian, Yu. Ts., Pokrovsky, I. V., Ponomarenko, V. A., Prokhorova, E. V., Rowley, N., Rusanov, A. Ya., Scarlassara, F., Stefanini, A. M., Stuttgé, L., Szilner, S., Trotta, M., Vinodkumar, A. M., and Voskressensky, V. M.

Published
2003
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39. Probing fission time scales with neutrons and GDR gamma rays

Author

Schmitt, R. P., Botting, T., Chubarian, G. G., Wolf, K. L., Hurst, B. J., Jabs, H., Hamelin, M., Bacak, A., Oganessian, Yu. Ts., Itkis, M. G., Kozulin, E. M., Kondratiev, N. A., Salamatin, V. S., Pokrovsky, I. V., Hanappe, F., de Goès Brennand, E., Huck, A., Stuttgé, L., Liatard, E., Beene, J., Varner, R., Halbert, M., and Gan, N.

Published
2003
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41. Synthesis of superheavy nuclei in 48Ca+244Pu interactions

Author

Oganessian, Yu. Ts., Utyonkov, V. K., Lobanov, Yu. V., Abdullin, F. Sh., Polyakov, A. N., Shirokovsky, I. V., Tsyganov, Yu. S., Gulbekian, G. G., Bogomolov, S. L., Gikal, B. N., Mezentsev, A. N., Iliev, S., Subbotin, V. G., Sukhov, A. M., Ivanov, O. V., Buklanov, G. V., Subotic, K., Itkis, M. G., Moody, K. J., Wild, J. F., Stoyer, N. J., Stoyer, M. A., and Lougheed, R. W.

Published
2000
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42. Erratum: Inverse quasifission in the reactions Gd 156,160 + W 186 (Physical Review C (2017) 96 (064621) DOI: 10.1103/PhysRevC.96.064621)

Author

Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., Vardaci, E., Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., and Vardaci, E.

Published
2018

44. Study of the properties of the superheavy nuclei Z = 117 produced in the 249Bk + 48Ca reaction

Author

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

Subjects
Physics, QC1-999
Abstract

The reaction of 249Bk with 48Ca have been reinvestigated to provide new evidence for the discovery of element 117 on a larger number of events. The experiments were performed at five projectile energies and with a total beam dose of 48Ca of about 4.6×1019. Two isotopes 293,294117 were synthesized in the 249Bk+48Ca reaction, providing excitation functions and α-decay spectra of the produced isotopes that establishes these nuclei to be the products of the 4n- and 3n-evaporation channels, respectively. Decay properties of 293,294117 and of all the daughter products agree with the data of the experiment in which these nuclei were synthesized for the first time in 2010. The new 289115 events, populated by α decay of 293117, demonstrate the same decay properties as those observed for 289115 produced in the 243Am(48Ca,2n) reaction thus providing crossbombardment 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.

Published
2014
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46. Study of Binary Processes in the Reactions of 36Ar + 144, 154Sm and 68Zn + 112Sn Leading to the Formation of Neutron-Deficient Compound 180, 190Hg Nuclei.

Author

Bogachev, A. A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Banerjee, T., Cheralu, M., Itkis, M. G., Mukhamedzhanov, E., Kumar, D., Pan, A., Pchelintsev, I. V., Vorob'ev, I. V., Trzaska, W. H., Vardaci, E., di Nitto, A., Khlebnikov, S. V., Harka, I., and Andreyev, A.

Abstract

A study is performed of the asymmetric fission of neutron-deficient mercury 180, 190Hg isotopes obtained in the reactions of 36Ar + 144, 154Sm and 68Zn + 112Sn at incident energies near and above the Coulomb barrier. The relative contributions from asymmetric and symmetric fission change along with the excitation energy of the fissile compound nucleus. The effect the characteristics of the entrance channel have on the dynamics of the reaction is studied. [ABSTRACT FROM AUTHOR]

Published
2021
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47. Inverse quasifission in the reactions Gd 156,160 + W 186

Author

Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., Vardaci, E., Kozulin, E. M., Zagrebaev, V. I., Knyazheva, G. N., Itkis, I. M., Novikov, K. V., Itkis, M. G., Dmitriev, S. N., Harca, I. M., Bondarchenko, A. E., Karpov, A. V., Saiko, V. V., and Vardaci, E.

Subjects
fission, quasifission, super heavy elements
Abstract

Background: Low-energy multinucleon transfer reactions may be used for production of new neutron-enriched heavy nuclei. Purpose: Our aim is to investigate the influence of proton (Z=82) and neutron (N=82, 126) shells as well as orientation effects on the formation of reaction products in the inverse quasifission process in the reactions 156,160Gd + 186W. Methods: Mass, energy, and angular distributions of primary binary fragments formed in the reactions 156Gd+186W at an energy of 878 MeV, and 160Gd+186W at 860 and 935 MeV, have been measured using the double-arm time-of-flight spectrometer CORSET at the U400 cyclotron of the Flerov Laboratory of Nuclear Reactions (FLNR) at the Joint Institute for Nuclear Research (JINR), Dubna. Results: Enhancement in the yield of products with masses 200–215 u has been found for both reactions. The cross sections of the formation of trans-target fragments with masses around 208 u are found to be about 10μb at the Coulomb barrier energy and reach the level of 0.5 mb at the energy above the barrier for side-to-side collision. Conclusions: The enhanced yield of products with masses heavier than the target mass confirms the important role of the closed shells at Z=82 and N=82, 126 in the inverse quasifission process in low-energy damped collisions. The orientation effect caused by the strong deformation of colliding nuclei can result in a gain in the yield of heavy target-like fragments.

Published
2017

48. Synthesis of nuclei of the superheavy element 114 in reactions induced by48 Ca

Author

Oganessian, Yu. Ts., Yeremin, A. V., Popeko, A. G., Bogomolov, S. L., Buklanov, G. V., Chelnokov, M. L., Chepigin, V. I., Gikal, B. N., Gorshkov, V. A., Gulbekian, G. G., Itkis, M. G., Kabachenko, A. P., Lavrentev, A. Yu., Malyshev, O. N., Rohac, J., Sagaidak, R. N., Hofmann, S., Saro, S., Giardina, G., and Morita, K.

Published
1999

49. Study of Mass-Asymmetric Fission of 180,190Hg Formed in the 36Ar + 144,154Sm Reactions.

Author

Kumar, D., Kozulin, E. M., Cheralu, M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Novikov, K. V., Bogachev, A. A., Kozulina, N. I., Diatlov, I. N., Pchelintsev, I. V., Vorobiev, I. V., Banerjee, T., Mukhamejanov, Y. S., Pan, A. N., Saiko, V. V., Singh, P. P., Sahoo, R. N., Andreyev, A. N., and Filipescu, D. M.

Abstract

Abstrac: t—The mass–energy distributions of fission fragments of excited 180,190Hg nuclei formed in 36Ar + 144,154Sm reactions are measured at incident 36Ar energies of 158, 181, and 222 MeV using the double-arm time-of-flight spectrometer CORSET. The asymmetric fission of 180,190Hg with the most probable masses of light and heavy fragments of 79 and 101 amu, and 84 and 106 amu, respectively, is observed in mass distributions of 180,190Hg at energies of excitation of up to 75 MeV. Two components manifesting the symmetric and asymmetric fission modes are observed in the kinetic energy distributions. [ABSTRACT FROM AUTHOR]

Published
2020
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50. Reaction mechanism studies using the CN/ER spin distribution

Author

Ackermann, D., Antalic, S., Axiotis, M., Bazzacco, D., Beghini, S., Berek, G., Corradi, L., Angelis, G. De, Farnea, E., Gadea, A., Heßberger, F. P., Hofmann, S., Itkis, M. G., Kniajeva, G. N., Kozulin, E. M., Latina, A., Martinez, T., Menegazzo, R., Montagnoli, G., Münzenberg, G., Oganessian, Yu. Ts., Rossi-Alvarez, C., Ruan, M., Sagaidak, R. N., Scarlassara, F., Stefanini, A. M., Szilner, S., Trotta, M., and Ur, C.

Published
2003
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