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  1. Article ; Online: Super-heavy element research.

    Oganessian, Yu Ts / Utyonkov, V K

    Reports on progress in physics. Physical Society (Great Britain)

    2015  Volume 78, Issue 3, Page(s) 36301

    Abstract: A review of the discovery and investigation of the 'island of stability' of super-heavy nuclei at the separator DGFRS (FLNR, JINR) in the fusion reactions of (48)Ca projectiles with target nuclei (238)U-(249)Cf is presented. The synthesis of the heaviest ...

    Abstract A review of the discovery and investigation of the 'island of stability' of super-heavy nuclei at the separator DGFRS (FLNR, JINR) in the fusion reactions of (48)Ca projectiles with target nuclei (238)U-(249)Cf is presented. The synthesis of the heaviest nuclei, their decay properties, and methods of identification are discussed. The role of shell effects in the stability of super-heavy nuclei is demonstrated by comparison of the experimental data and results of theoretical calculations. The radioactive properties of the new nuclei, the isotopes of elements 112-118 as well as of their decay products, 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.
    Language English
    Publishing date 2015-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 205657-4
    ISSN 1361-6633 ; 0034-4885
    ISSN (online) 1361-6633
    ISSN 0034-4885
    DOI 10.1088/0034-4885/78/3/036301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Discovery of the New Element Z=117 and Confirmation of 115

    Oganessian Yu. Ts. / Hamilton J.H. / Utyonkov V.K.

    EPJ Web of Conferences, Vol 17, p

    2011  Volume 02001

    Abstract: The discovery of the new chemical element with atomic number Z=117 is presented. The isotopes 293 117 and 294117 were produced in fusion reactions between 48Ca and 249Bk. The 249Bk was produced in the High Flux Isotope Reactor and chemically separated at ...

    Abstract The discovery of the new chemical element with atomic number Z=117 is presented. The isotopes 293 117 and 294117 were produced in fusion reactions between 48Ca and 249Bk. The 249Bk was produced in the High Flux Isotope Reactor and chemically separated at Oak Ridge. Decay chains involving eleven new nuclei were identified by means of the Dubna Gas-Filled Recoil Separator. The measured decay properties show a strong rise of stability for superheavy nuclei toward N=184.The reaction 243Am+48Ca was studied at three energies. Twenty one decay chains of 288115 and one decay chain of 289115 were observed to confirm the earlier discoveries of Z=115 and 117.
    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
    Language English
    Publishing date 2011-10-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Conference proceedings: Fusion dynamics at the extremes

    Oganessian, Yu. Ts / Zagrebaev, V. I

    proceedings of the International Workshop, Dubna, Russia, 25 - 27 May 2000

    2001  

    Institution International Workshop on Fusion Dynamics at the Extremes
    Event/congress International Workshop on Fusion Dynamics at the Extremes (2000.05.25-27, Dubna)
    Author's details eds.: Yu. Ts. Oganessian, V.I. Zagrebaev
    Language English
    Size X, 364 S, Ill., graph. Darst, 23 cm.
    Publisher World Scientific
    Publishing place Singapore u.a.
    Document type Book ; Conference proceedings
    Note Includes bibliographical references and index
    ISBN 981024617X ; 9789810246174
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  4. Book ; Conference proceedings ; Online: International Workshop on Fusion Dynamics at the Extremes

    Oganessian, Yu. Ts / Zagrebaev, Valeriĭ I

    Dubna, Russia, 25-27 May 2000

    2001  

    Abstract: This book deals with the properties and fusion dynamics of very heavy nuclei. It contains the latest experimental results on the formation and fission of superheavy nuclei and on the near-barrier fusion of light exotic nuclei, along with the different ... ...

    Title variant Fusion dynamics at the extremes
    Institution International Workshop on Fusion Dynamics at the Extremes
    ebrary, Inc
    Event/congress International Workshop on Fusion Dynamics at the Extremes (2000, DubnaChekhovskiĭraĭonRussia)
    Author's details editors, Yu. Ts. Oganessian, V.I. Zagrebaev
    Abstract This book deals with the properties and fusion dynamics of very heavy nuclei. It contains the latest experimental results on the formation and fission of superheavy nuclei and on the near-barrier fusion of light exotic nuclei, along with the different theoretical approaches to the description of fusion dynamics and microscopic properties of superheavy nuclei. The book also discusses nuclear collective dynamics and expectations from the use of accelerated beams of radioactive nuclei in fusion reactions. Contents: Aspects of Fusion, Fission and Cluster Radioactivity (W Greiner); Superheavy Nucle
    Keywords Nuclear fission ; Nuclear fusion ; Nuclear reactions ; Radioactive nuclear beams ; Superheavy elements
    Language English
    Size Online-Ressource (x, 364 p), ill
    Publisher World Scientific
    Publishing place Singapore ;River Edge, N.J
    Document type Book ; Conference proceedings ; Online
    Note Includes bibliographical references and index
    ISBN 9789810246174 ; 981024617X
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Article ; Online: Spin distribution measurement for 64Ni + 100Mo at near and above barrier energies

    Singh Varinderjit / Ackermann D. / Antalic S. / Axiotis M. / Bazzacco D. / Corradi L. / De Angelis G. / Farnea E. / Gadea A. / Heßberger F.P. / Itkis M.G. / Kniajeva G.N. / Kozulin E.M. / Martinez T. / Marginean N. / Menegazzo R. / Montagnoli G. / Napoli D.R. / Oganessian Yu. Ts. /
    Ruan M. / Sagaidak R.N. / Scarlassara F. / Stefanini A.M. / Szilner S. / Ur C.

    EPJ Web of Conferences, Vol 86, p

    2015  Volume 00053

    Abstract: Spin distribution measurements were performed for the reaction 64Ni + 100Mo at three beam energies ranging from 230 to 260 MeV. Compound nucleus (CN) spin distributions were obtained channel selective for each evaporation residue populated by the de- ... ...

    Abstract Spin distribution measurements were performed for the reaction 64Ni + 100Mo at three beam energies ranging from 230 to 260 MeV. Compound nucleus (CN) spin distributions were obtained channel selective for each evaporation residue populated by the de-excitation cascade. A comparison of the spin distribution at different beam energies indicates that its slope becomes steeper and steeper with increasing beam energy. This change in slope of the spin distribution is mainly due to the onset of fission competition with particle evaporation at higher beam energies.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: The status of new fragment separator ACCULINNA-2 project and the first day experiments

    Krupko S.A. / Fomichev A.S. / Grigorenko L.V. / Golovkov M.S. / Stepantsov S.V. / Ter-Akopian G.M. / Bezbakh A.A. / Chudoba V. / Egorova I.A. / Ershov S.N. / Gorshkov A.V. / Gorshkov V.A. / Kaminski G. / Korsheninnikov A.A. / Kuzmin E.A. / Nikolskii E.Yu. / Oganessian Yu.Ts. / Parfenova Yu.L. / Sharov P.G. /
    Sidorchuk S.I. / Slepnev R.S. / Wolski R. / Yukhimchuk A.A. / Zhukov M.V.

    EPJ Web of Conferences, Vol 66, p

    2014  Volume 11021

    Abstract: The new facility fragment separator ACCULINNA-2 will be put into operation at the beginning of 2015 in FLNR JINR. The new separator is destined to add considerably to the studies of drip-line nuclei performed with the use of variety of direct reactions ... ...

    Abstract The new facility fragment separator ACCULINNA-2 will be put into operation at the beginning of 2015 in FLNR JINR. The new separator is destined to add considerably to the studies of drip-line nuclei performed with the use of variety of direct reactions known to be distinctive to the 15 – 50 MeV/amu exotic secondary RIBs. Intense beams provided by the U-400M cyclotron will ensure the achievement of this objective. In addition to the RIB separation accomplished by means of the dipole-wedge-dipole selection, the addition of a zero-degree dipole magnet setup is foreseen. A long (13 m) straight section will provide precise time-of-flight measurements.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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

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

    Physical review letters

    2012  Volume 108, Issue 2, Page(s) 22502

    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 ... ...

    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.
    Language English
    Publishing date 2012-01-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.108.022502
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Study of the properties of the superheavy nuclei Z = 117 produced in the 249Bk + 48Ca reaction

    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. / Vostokin G. K.

    EPJ Web of Conferences, Vol 66, p

    2014  Volume 02073

    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× ... ...

    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.
    Keywords Physics ; QC1-999 ; Science ; Q
    Language English
    Publishing date 2014-03-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
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  9. Article ; Online: Production and decay of the heaviest nuclei (293,294)117 and (294)118.

    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 / Vostokin, G K

    Physical review letters

    2012  Volume 109, Issue 16, Page(s) 162501

    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 ... ...

    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.
    Language English
    Publishing date 2012-10-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.109.162501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Structure of 10He low-lying states uncovered by correlations.

    Sidorchuk, S I / Bezbakh, A A / Chudoba, V / Egorova, I A / Fomichev, A S / Golovkov, M S / Gorshkov, A V / Gorshkov, V A / Grigorenko, L V / Jalůvková, P / Kaminski, G / Krupko, S A / Kuzmin, E A / Nikolskii, E Yu / Oganessian, Yu Ts / Parfenova, Yu L / Sharov, P G / Slepnev, R S / Stepantsov, S V /
    Ter-Akopian, G M / Wolski, R / Yukhimchuk, A A / Filchagin, S V / Kirdyashkin, A A / Maksimkin, I P / Vikhlyantsev, O P

    Physical review letters

    2012  Volume 108, Issue 20, Page(s) 202502

    Abstract: The 0+ ground state of the 10He nucleus produced in the 3H(8He,p)10He reaction was found at about 2.1±0.2  MeV (Γ∼2  MeV) above the three-body ^{8}He+n+n breakup threshold. Angular correlations observed for ^{10}He decay products show prominent ... ...

    Abstract The 0+ ground state of the 10He nucleus produced in the 3H(8He,p)10He reaction was found at about 2.1±0.2  MeV (Γ∼2  MeV) above the three-body ^{8}He+n+n breakup threshold. Angular correlations observed for ^{10}He decay products show prominent interference patterns allowing us to draw conclusions about the structure of low-energy excited states. We interpret the observed correlations as a coherent superposition of a broad 1- state having a maximum at energy 4-6 MeV and a 2+ state above 6 MeV, setting both on top of the 0+ state "tail." This anomalous level ordering indicates that the breakdown of the N=8 shell known in 12Be thus extends also to the ^{10}He system.
    Language English
    Publishing date 2012-05-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.108.202502
    Database MEDical Literature Analysis and Retrieval System OnLINE

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