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113 results on '"Itkis, M. G."'

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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7. 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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8. 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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9. 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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13. 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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14. 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. 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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17. Experimental investigation of cross sections for the production of heavy and superheavy nuclei.

Author

Itkis, M. G., Knyazheva, G. N., Itkis, I. M., and Kozulin, E. M.

Subjects
*HEAVY nuclei, *DEEP inelastic collisions, *NUCLEAR fusion, *HEAVY ions
Abstract

In the reactions with heavy ions leading to superheavy nuclei the formation of a compound nucleus is suppressed strongly by competing quasifission process and deep inelastic collisions. Moreover, the excited compound nucleus formed in fusion reactions mainly undergoes fission. The study of fission of heavy and superheavy nuclei gives important information about compound nucleus formation cross sections, fission barriers and survival probabilities of these nuclei. The main recent results of the experimental studies of the compound nucleus fission and quasifission processes in the heavy-ion-induced reactions leading to the formation of nuclei with Z ≥ 102 are discussed. The most attention is paid to the experimental investigations of mass-energy distributions of reaction products measured using the CORSET spectrometer. [ABSTRACT FROM AUTHOR]

Published
2022
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23. 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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24. 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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25. 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., and Wu, Y. W.

Published
2005
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26. 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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27. 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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28. 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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30. 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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31. 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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33. 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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35. 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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37. 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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38. 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

39. 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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40. 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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41. Fission and quasifission toward the superheavy mass region.

Author

Vardaci, E, Itkis, M G, Itkis, I M, Knyazheva, G, and Kozulin, E M

Subjects
*SUPERHEAVY elements, *NUCLEAR fusion
Abstract

The pathway toward the production of superheavy elements (SHE) crosses with the one of an in-depth study of the fission and quasifission processes. Quasifission affects the probability of forming a compound nucleus (CN) after capture and fission plays a decisive role during the cooling of the CN. To search for optimal reactions to produce SHE in fusion reactions and to provide an estimate of their production cross section measurements of the capture and fusion cross sections along with the survival probabilities are a mandatory task. Here an overview of the impact of fission and quasifission over the synthesis of SHE is discussed along with the need to perform measurements over a wide range of masses and energies. [ABSTRACT FROM AUTHOR]

Published
2019
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45. Proton-Induced Fission of 232Th at Low and Intermediate Energies.

Author

Pan, A. N., Kozulin, E. M., Itkis, I. M., Itkis, M. G., Knyazheva, G. N., Gikal, K. B., Novikov, K. V., Kvochkina, T. N., Burtebayev, N. T., and Covalchuk, K. V.

Abstract

Mass-energy distributions of fission fragments are measured in the proton energy region of 7 to 55 MeV in order to study shell effects in the fissioning of 232Th nuclei induced by protons at low and intermediate energies. Experiments at proton energies of 13 to 55 MeV are performed using proton beams from the K-130 cyclotron at the University of Jyväskylä (Finland) using the CORSET two-armed time-of-flight spectrometer. Experiments at proton energies of 7, 10, and 13 MeV are performed using the beam from the U‒150M cyclotron at the Institute of Nuclear Physics in Almaty (Kazakhstan) using a 2Е spectrometer for detecting fission fragments. It is found that the yield of symmetric fragments falls along with the proton energy, while the yield of asymmetric fragments rises. Deep below the Coulomb barrier at the lowest proton energy of 7 MeV, an increased yield of fission fragments is observed in the region of 60−70 a.m.u., which corresponds to the superasymmetric mode of fission. [ABSTRACT FROM AUTHOR]

Published
2018
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46. Searching for the Superasymmetric Fission Mode of 248Cf, 254Fm, and 260No in Reactions 22Ne + 232Th, 238U; 16O + 232Th, 238U.

Author

Gikal, K. B., Kozulin, E. M., Itkis, I. M., Itkis, M. G., Knyazheva, G. N., Novikov, K. V., and Pan, A. N.

Abstract

The mass and energy distributions of fission fragments in reactions 16O + 232Th, 16O + 238U, 22Ne + 232Th, and 22Ne + 238U are measured to investigate the role of closed proton and neutron shells in the fission of 248Cf, 254Fm, and 260No nuclei at excitation energies of 40-45 MeV. Experiments are performed on the U-400 cyclotron at the Flerov Laboratory of Nuclear Reactions (Dubna, Russia) using the CORSET double-arm time-of-flight spectrometer. For compound nucleus 260No* formed in the reaction 22Ne + 238U, an increase in the fragment yields is observed in the superasymmetric mass region 52/208 amu, which corresponds to the formation of fissioning pairs of two double-magic nuclei, 48Ca and 208Pb. Superasymmetric fission at a mass yield level of 10−5 was not observed for compound nuclei 248Cf and 254Fm* formed in reactions 16O + 232Th, 16O + 238U, and 22Ne + 232Th at an initial excitation energy of 40−45 MeV. Bimodal fission was observed for the 260No*compound nucleus at an initial excitation energy of 41 MeV. In the symmetric mass split, both fission fragments are in this case close to double-magic 132Sn. [ABSTRACT FROM AUTHOR]

Published
2018
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48. FUSION-FISSION OF SUPERHEAVY NUCLEI AND CLUSTERING PHENOMENA.

Author

ITKIS, M. G., KNYAZHEVA, G. N., and KOZULIN, E. M.

Subjects
*CLUSTER theory (Nuclear physics), *NUCLEAR size (Physics), *SPECTRAL energy distribution, *NUCLEAR reactions, *NUCLEAR physics
Abstract

Mass and energy distributions of binary fragments are discussed for a wide range of nuclei with Z = 82–122 produced in reactions induced by 12C, 16O, 26Mg, 48Ca, 50Ti, 58Fe, 64Ni and 86Kr ions at energies close and below the Coulomb barrier. It is found that clustering phenomena have a great influence on the formation of the reaction products for fusion-fission and quasifission processes. [ABSTRACT FROM AUTHOR]

Published
2008
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49. Investigation of the 208Pb(18O, f) fission reaction: Mass-energy distributions of fission fragments and their correlation with the gamma-ray multiplicity.

Author

Rusanov, A. Ya., Itkis, M. G., Kondratiev, N. A., Pashkevich, V. V., Pokrovsky, I. V., Salamatin, V. S., and Chubarian, G. G.

Subjects
*GAMMA rays, *ELECTROMAGNETIC waves, *GAMMA decay, *GAMMA ray sources, *IONIZING radiation
Abstract

The mass-energy distributions of fragments originating from the fission of the compound nucleus 226Th and their correlations with the multiplicity of gamma rays emitted from these fragments are measured and analyzed in 18O + 208Pb interaction induced by projectile oxygen ions of energy in the range E lab = 78–198.5 MeV. Manifestations of an asymmetric fission mode, which is damped exponentially with increasing E lab, are demonstrated. Theoretical calculations of fission valleys reveal that only two independent valleys, symmetric and asymmetric, exist in the vicinity of the scission point. The dependence of the multiplicity of gamma rays emitted from both fission fragments on their mass, Mγ(M), has a complicated structure and is highly sensitive to shell effects in both primary and final fragments. A two-component analysis of the dependence Mγ(M) shows that the asymmetric mode survives in fission only at low partial-wave orbital angular momenta of compound nuclei. It is found that, for all E lab, the gamma-ray multiplicity Mγ as a function of the total kinetic energy (TKE) of fragments, Mγ(TKE), decreases linearly with increasing TKE. An analysis of the energy balance in the fission process at the laboratory energy of E lab = 78 MeV revealed the region of cold fission of fragments whose total kinetic energy is TKE ∼ Q max. [ABSTRACT FROM AUTHOR]

Published
2008
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50. Investigation of the reaction 208Pb(18O, f): Folding angular distributions of fission fragments and gamma-ray multiplicity.

Author

Rusanov, A. Ya., Itkis, M. G., Kondratiev, N. A., Pokrovsky, I. V., Salamatin, V. S., and Chubarian, G. G.

Subjects
*ANGULAR correlations (Nuclear physics), *STATISTICAL correlation, *NUCLEAR fission, *GAMMA rays, *ANGULAR momentum (Nuclear physics)
Abstract

Correlations between folding angular distributions of fission fragments and the gamma-ray multiplicity are studied for 18O + 208Pb interactions at energies of the beam of 18O ions in the range E lab = 78–198.5 MeV. The probabilities are determined for complete-and incomplete-fusion processes inevitably followed by the fission of nuclei formed in these processes. It is found that the probability of incomplete fusion followed by fission increases with increasing energy of bombarding ions. It is shown that, for the incomplete-fusion process, folding angular distributions of fission fragments have a two-component structure. The width of folding angular distributions (FWHM) for complete fusion grows linearly with increasing energy of 18O ions. The multiplicity of gamma rays from fission fragments as a function of the linear-momentum transfer behaves differently for different energies of projectile ions. This circumstance is explained here by the distinction between the average angular momenta of participant nuclei in the fusion and fission channels, which is due to the difference in the probabilities of fission in the cases where different numbers of nucleons are captured by the target nucleus. [ABSTRACT FROM AUTHOR]

Published
2007
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