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Yu.Ts. Oganessian V.K. Utyonkov Yu.V. Lobanov F.Sh. Abdullin A.N. Polyakov I.V. Shirokovsky Yu.S. Tsyganov G.G. Gulbekian S.L. Bogomolov B.N. Gikal A.N. Mezentsev S. Iliev V.G. Subbotin A.M. Sukhov O.V. Ivanov G.V. Buklanov K. Subotic A.A. Voinov M.G. Itkis K.J. Moody J.F. Wild N.J. Stoyer M.A. Stoyer R.W. Lougheed C.A. Laue 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):201-204
This paper presents results of the experiments aimed at producing long-lived superheavy elements located near the spherical-shell
closures with Z ⩾ 114 and N ⩾ 172 in the 244Pu + 48Ca and 248Cm + 48Ca reactions. The large measured α-particle energies of the newly observed nuclei, together with the long decay times and
spontaneous fission terminating the chains, offer evidence of the decay of nuclei with high atomic numbers. The decay properties
of the synthesized nuclei are consistent with the consecutive α-decays originating from the parent nuclides 288, 289114 and 292116, produced in the 3n and 4n evaporation channels with cross-sections of about a picobarn. The present observations can be considered as experimental
evidence of the existence of the “island of stability” of superheavy elements.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
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ID="a"e-mail: utyonkov@sungns.jinr.ru 相似文献
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Yu. Ts. Oganessian Yu. A. Lazarev V. L. Mikheev Yu. A. Muzychka I. V. Shirokovsky S. P. Tretyakova V. K. Utyonkov 《Zeitschrift für Physik A Hadrons and Nuclei》1994,349(3-4):341-342
A search for the12C decay of114Ba produced in the58Ni(58Ni,2n) reaction was performed by using polycarbonate track detectors. Assuming the total half-life of114Ba to be 0.1 s, the lower limit T c ≥103 s for the partial12C-decay half-life was established. 相似文献
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A Gurtu P K Malhotra I S Mittra P M Sood SC Gupta VK Gupta GL Kaul LK Mangotra Y Prakash NK Rao ML Sharma 《Pramana》1974,3(5):311-322
This is a continuation of our earlier investigation (Gurtuet al 1974Phys. Lett. 50 B 391) on multiparticle production in proton-nucleus collisions based on an exposure of emulsion stack to 200 GeV/c beam at the NAL. It is found that the ratioR em = 〈n s〉/〈n ch〉, where 〈n ch〉 is the charged particle multiplicity in pp-collisions, increases slowly from about 1 at 10 GeV/c to 1·6 at 68 GeV/c and attains a constant value of 1·71 ± 0·04 in the region 200 to 8000 GeV/c. Furthermore,R em = 1·71 implies an effectiveA-dependence ofR A =A 0.18,i.e., a very weak dependence. Predictions ofR em on various models are discussed and compared with the emulsion data. Data seem to favour models of hadron-nucleon collisions in which production of particles takes place through adouble step mechanism,e.g., diffractive excitation, hydrodynamical and energy flux cascade as opposed to models which envisage instantaneous production. 相似文献
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The eigen frequencies of radial pulsations of neutron stars are calculated in a strong magnetic field. At low densities we
use the magnetic BPS equation of state (EOS) similar to that obtained by Lai and Shapiro while at high densities the EOS obtained
from the relativistic nuclear mean field theory is taken and extended to include strong magnetic field. It is found that magnetized
neutron stars support higher maximum mass whereas the effect of magnetic field on radial stability for observed neutron star
masses is minimal. 相似文献
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Oganessian YTs Abdullin FSh Dmitriev SN Gostic JM Hamilton JH Henderson RA Itkis MG Moody KJ Polyakov AN Ramayya AV Roberto JB Rykaczewski KP Sagaidak RN Shaughnessy DA Shirokovsky IV Stoyer MA Subbotin VG Sukhov AM Tsyganov YS Utyonkov VK Voinov AA Vostokin GK 《Physical review letters》2012,108(2):022502
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. 相似文献
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Munshi G Mustafa Sudhir Raniwala T Awes B Rai RS Bhalerao JG Contreras RV Gavai SK Ghosh P Jaikumar GC Mishra AP Mishra H Mishra B Mohanty J Nayak J-Y Ollitrault SC Phatak L Ramello R Ray PK Sahu AM Srivastava DK Srivastava VK Tiwari 《Pramana》2006,67(5):961-981
This is the report of Heavy Ion Physics and Quark-Gluon Plasma at WHEPP-09 which was part of Working Group-4. Discussion and
work on some aspects of quark-gluon plasma believed to have created in heavy-ion collisions and in early Universe are reported. 相似文献
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Nikolay V. Aksenov Patrick Steinegger Farid Sh. Abdullin Yury V. Albin Gospodin A. Bozhikov Viktor I. Chepigin Robert Eichler Vyacheslav Ya. Lebedev Alexander Sh. Madumarov Oleg N. Malyshev Oleg V. Petrushkin Alexander N. Polyakov Yury A. Popov Alexey V. Sabel’nikov Roman N. Sagaidak Igor V. Shirokovsky Maksim V. Shumeiko Gennadii Ya. Starodub Yury S. Tsyganov Vladimir K. Utyonkov Alexey A. Voinov Grigory K. Vostokin Alexander V. Yeremin Sergey N. Dmitriev 《The European Physical Journal A - Hadrons and Nuclei》2017,53(7):158
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Yu Ts Oganessian A. G. Demin M. Hussonnois S. P. Tretyakova Yu P. Kharitonov V. K. Utyonkov I. V. Shirokovsky O. Constantinescu H. Bruchertseifer Yu S. Korotkin 《Zeitschrift für Physik A Hadrons and Nuclei》1984,319(2):215-217
In bombarding209Bi and207, 208Pb targets by55Mn and58Fe ions the yields of “cold fusion” reactions have been determined using a sensitive technique for detectingT 1/2≧1 ms spontaneous fission and theα-decay of heavy actinide elements. It has been shown that theA = 263–265 isotopes of element 108, including the even-even isotope264108, undergo mainlyα-decay. The obtained results, together with the known data on the properties of the isotopes of elements 104 and 106, provide evidence for the enhanced stability of theZ=108 nuclei against spontaneous fission. 相似文献