A. A. Voinov
A5071680182- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Radioactive Decay and Measurement Techniques
- Rare-earth and actinide compounds
- Radiopharmaceutical Chemistry and Applications
- Radioactive element chemistry and processing
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Fusion materials and technologies
- Astro and Planetary Science
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Cold Fusion and Nuclear Reactions
- Cyclone Separators and Fluid Dynamics
- Advanced Chemical Physics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Mass Spectrometry Techniques and Applications
- Medical Imaging Techniques and Applications
- Nuclear Materials and Properties
- Rocket and propulsion systems research
- Thermodynamic and Structural Properties of Metals and Alloys
Joint Institute for Nuclear Research
2014-2024
Institute for Nuclear Research
2022
Russian State Library
2019
Dubna State University
2015
Ohio University
2008
Lawrence Livermore National Laboratory
2003
Office of Scientific and Technical Information
2003
National Technical Information Service
2003
The decay properties of ${}^{290}116$ and ${}^{291}116$, the dependence their production cross sections on excitation energies compound nucleus, ${}^{293}116$, have been measured in $^{245}\mathrm{Cm}$ ($^{48}\mathrm{Ca}$, $\mathit{xn}$)${}^{293\ensuremath{-}x}116$ reaction. These isotopes element 116 are daughters 118 isotopes, which produced via $^{249}\mathrm{Cf}+^{48}\mathrm{Ca}$ We performed experiment at two projectile energies, corresponding to ${}^{297}118$ nucleus...
The discovery of a new chemical element with atomic number Z=117 is reported. isotopes (293)117 and (294)117 were produced in fusion reactions between (48)Ca (249)Bk. Decay chains involving 11 nuclei identified by means the Dubna gas-filled recoil separator. measured decay properties show strong rise stability for heavier Z > or = 111, validating concept long sought island enhanced superheavy nuclei.
We have studied the dependence of production cross sections isotopes $^{282,283}112$ and $^{286,287}114$ on excitation energy compound nuclei $^{286}112$ $^{290}114$. The maximum section values $xn$-evaporation channels for reaction $^{238}\mathrm{U}(^{48}\mathrm{Ca},xn)^{286\ensuremath{-}x}112$ were measured to be ${\ensuremath{\sigma}}_{3n}={2.5}_{\ensuremath{-}1.1}^{+1.8}\phantom{\rule{0.3em}{0ex}}\mathrm{pb}$...
The results of experiments designed to synthesize element 115 isotopes in the $^{243}\mathrm{Am}+^{48}\mathrm{Ca}$ reaction are presented. With a beam dose $4.3\ifmmode\times\else\texttimes\fi{}{10}^{18}$ $248\text{\ensuremath{-}}\text{MeV}$ $^{48}\mathrm{Ca}$ projectiles, we observed three similar decay chains consisting five consecutive $\ensuremath{\alpha}$ decays, all detected time intervals about $20\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ and terminated at later by spontaneous fission...
Two years after the discovery of element 117, we undertook a second campaign using (249)Bk+(48)Ca reaction for further investigations production and decay properties isotopes 117 on larger number events. The experiments were started in end April 2012 are still under way. This Letter presents results obtained 1200 hours an experimental run with beam dose (48)Ca about 1.5×10(19) particles. (249)Bk target was irradiated at two energies that correspond to maximum probability channels evaporation...
We have studied the excitation functions of reactions $^{244}\mathrm{Pu}$($^{48}\mathrm{Ca}$,$xn$). Maximum cross sections for evaporation 3--5 neutrons in complete-fusion reaction $^{244}\mathrm{Pu+}^{48}\mathrm{Ca}$ were measured to be ${\ensuremath{\sigma}}_{3n}=2\phantom{\rule{0.3em}{0ex}}\text{pb}$, ${\ensuremath{\sigma}}_{4n}=5\phantom{\rule{0.3em}{0ex}}\text{pb}$, and ${\ensuremath{\sigma}}_{5n}=1\phantom{\rule{0.3em}{0ex}}\text{pb}$. The decay properties $3n$-evaporation product...
An experiment aimed at the synthesis of isotopes element 120 has been performed using $^{244}\mathrm{Pu}(^{58}\mathrm{Fe},\mathit{xn}){}^{302\ensuremath{-}x}120$ reaction. No decay chains consistent with fusion-evaporation reaction products were observed during an irradiation a beam dose $7.1\ifmmode\times\else\texttimes\fi{}{10}^{18} 330\text{\ensuremath{-}}\mathrm{MeV} {}^{58}\mathrm{Fe}$ projectiles. The sensitivity corresponds to cross section 0.4 pb for detection one decay.
The results of two experiments designed to synthesize element 115 isotopes in the $^{243}\mathrm{Am}+^{48}\mathrm{Ca}$ reaction are presented. Two new elements with atomic numbers 113 and were observed for first time. With 248-MeV $^{48}\mathrm{Ca}$ projectiles, we three similar decay chains consisting five consecutive \ensuremath{\alpha} decays, all detected a total time interval 30 s. Each chain was terminated by spontaneous fission (SF) high-energy release lifetime about day. 253-MeV...
Received 4 February 2004DOI:https://doi.org/10.1103/PhysRevC.69.029902©2004 American Physical Society
Results from the production and decay properties of element 115 nuclei observed using reaction ${}^{243}\mathrm{Am}+{}^{48}\mathrm{Ca}$ at various beam energies between November 1, 2010, February 26, 2012, Dubna Gas Filled Recoil Separator are presented. This long-running experiment with a total dose $3.3\ifmmode\times\else\texttimes\fi{}{10}^{19}$ carried out in excitation energy range ${E}^{*}=31$--47 MeV ${}^{291}$115 compound nucleus resulted observation three isotopes masses 287, 288,...
The decay properties of the new isotope ${}^{282}113$ and its daughter nuclei have been measured in $^{237}\mathrm{Np}$($^{48}\mathrm{Ca}$, $3n$)${}^{282}113$ reaction. During an irradiation with a beam dose $1.1\ifmmode\times\else\texttimes\fi{}{10}^{19}244$-MeV $^{48}\mathrm{Ca}$ projectiles, two chains originating from odd-odd...
Studies of superheavy nuclei produced in the ${}^{249}$Bk + ${}^{48}$Ca reaction were performed using Dubna Gas Filled Recoil Separator. The cross section for production ${}^{293}$117 and ${}^{294}$117 isotopes was measured at five excitation energies ${}^{297}$117 compound nucleus ranging from 30 to 48 MeV yielding maximum values 1.1${}_{\ensuremath{-}0.6}^{+1.2}$ pb $3n$ 2.4${}_{\ensuremath{-}1.4}^{+3.3}$ $4n$ channels. Alpha emission ${}^{281}$Rg competing with spontaneous fission...
The heaviest isotopes of elements Z=117 to Z=105, 294117, 293117, 290115, 289115, 286113, 285113, Rg282, Rg281, Mt278, Bh274, and Db270, were identified by means the Dubna gas-filled recoil separator among products Bk249 + Ca48 reaction. details observed six decay chains, indicating production 293117 are presented discussed. energies resulting half-lives these new nuclei show a strong rise stability with increasing neutron number, validating concept island enhanced for superheavy [Oganessian...
Results of a new series experiments on the study production cross sections and decay properties isotopes element 115 in reaction (243)Am+(48)Ca are presented. Twenty-one chains originating from (288)115 were established as product 3n-evaporation channel by measuring excitation function at three energies compound nucleus (291)115. The all newly observed nuclei full agreement with those we measured 2003. At lowest energy E*=33 MeV, for first time registered 2n-evaporation channel, (289)115,...
Irradiations of $^{239}\mathrm{Pu}$ and $^{240}\mathrm{Pu}$ targets with $^{48}\mathrm{Ca}$ beams aimed at the synthesis $Z=114$ flerovium isotopes were performed Dubna Gas Filled Recoil Separator. A new spontaneously fissioning (SF) isotope $^{284}\mathrm{Fl}$ was produced for first time in $^{240}\mathrm{Pu}+^{48}\mathrm{Ca}$ (250 MeV) $^{239}\mathrm{Pu}+^{48}\mathrm{Ca}$ (245 reactions. The cross section $^{239}\mathrm{Pu}(^{48}\mathrm{Ca},3n)^{284}\mathrm{Fl}$ reaction channel about 20...
We present results of the first experiment aimed at synthesis Mc isotopes in 243Am+48Ca reaction performed new gas-filled separator DGFRS-2 online to cyclotron DC280 Super Heavy Element Factory JINR. Fifty-five decay chains 288Mc and six assigned 289Mc were detected. The α 268Db with an energy 7.6–8.0 MeV, half-life 16+6−4h, a branch 55+20−15% was registered for time, spontaneously fissioning isotope 264Lr 4.9+2.1−1.3h identified. cross section 243Am(48Ca,3n)288Mc measured be 17.1+6.3−4.7...
The $^{232}\mathrm{Th}$($^{48}\mathrm{Ca},5n$)$^{275}\mathrm{Ds}$ and $^{238}\mathrm{U}$($^{40}\mathrm{Ar},5n$)$^{273}\mathrm{Ds}$ reactions have been studied at the gas-filled separator DGFRS-2 Superheavy Element Factory Flerov Laboratory of Nuclear Reactions, Joint Institute for Research. For first time, a new isotope $^{275}\mathrm{Ds}$ with half-life $0.{43}_{\ensuremath{-}0.12}^{+0.29}$ ms \ensuremath{\alpha}-particle energy $11.20\ifmmode\pm\else\textpm\fi{}0.02$ MeV was synthesized in...
Production and decay of the isotopes Hs were studied in ${}^{226}$Ra+${}^{48}$Ca reaction at beam energies ${E}_{\mathrm{lab}}=229$, 234, 241 MeV. At ${E}_{\mathrm{lab}}=234$ MeV energy, maximum 4$n$-evaporation channel reaction, six identical $\ensuremath{\alpha}$-SF chains nucleus ${}^{270}$Hs detected corresponding to a cross section ${\ensuremath{\sigma}}_{4n}={16}_{\ensuremath{-}7}^{+13}$ pb. other ${}^{48}$Ca energies, no observed. Nuclei undergo $\ensuremath{\alpha}$ with...
The search for new decay chains of oganesson isotopes is presented. experiment utilized the Dubna Gas Filled Recoil Separator and a highly segmented recoil-decay detection system. signals from all detectors were analyzed in parallel by digital analog data acquisition systems. For first time, target mixed californium (51% $^{249}\mathrm{Cf}$, 13% $^{250}\mathrm{Cf}$, 36% $^{251}\mathrm{Cf})$ recovered decayed $^{252}\mathrm{Cf}$ sources was produced irradiated with an intense...
A new short-lived neutron-deficient isotope Np220 was synthesized in the fusion-evaporation reaction Re185(Ar40,5n)Np220 at gas-filled recoil separator SHANS. Based on measurement of correlated α-decay chains, decay properties with Eα=10040(18) keV and T1/2=25−7+14 μs were determined, which are good agreement theoretical predictions. From experimental results coupled recently reported data Np219,223, systematics for Np isotopes around N=126 established, allows us first time to test...
In this paper, we present results of the second experiment on synthesis Mc isotopes in $^{243}\mathrm{Am}+^{48}\mathrm{Ca}$ reaction performed at gas-filled separator DGFRS-2 SHE Factory JINR. The new isotope $^{286}\mathrm{Mc}$ was synthesized, and its half-life $20\begin{array}{c}+98\\ \ensuremath{-}9\end{array}$ ms \ensuremath{\alpha}-particle energy $10.71\ifmmode\pm\else\textpm\fi{}0.02$ MeV were determined. A $^{286}\mathrm{Mc} \ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{decay}$...
Experiments using a $^{48}\mathrm{Ca}$ beam on $^{238}\mathrm{U}$ and $^{242}\mathrm{Pu}$ targets to produce superheavy nuclei were performed at the gas-filled separator DGFRS-2 online new cyclotron DC280 SHE Factory JINR. The decay properties of $^{286}\mathrm{Fl}$ $^{287}\mathrm{Fl}$, as well their \ensuremath{\alpha}-decay products, refined after detection 25 69 chains, respectively. In addition, 16 chains $^{283}\mathrm{Cn}$ observed in $^{238}\mathrm{U}+^{48}\mathrm{Ca}$ reaction....
The Th232+Ca48 reaction has been studied at the gas-filled separator DGFRS-2 online to cyclotron DC280 SHE Factory JINR. Three new nuclides were synthesized for first time: a spontaneously fissioning (SF) Sg268 with half-life TSF=13+17−4 s; an α decaying Hs272 Tα=0.16+0.19−0.06 s and Eα=9.63±0.02MeV; Ds276 T1/2=0.15+0.10−0.04 ms, Eα=10.75±0.03MeV, SF branch of 57%. decay properties these nuclei are in agreement systematics experimental partial half-lives α-decay energies heavy known nuclei,...
We present new results from investigations of the $^{240}\mathrm{Pu}+^{48}\mathrm{Ca}$ reaction at a projectile energy 250 MeV. Three decay chains $^{285}\mathrm{Fl}$ were detected with properties mostly consistent those measured in earlier studies. An additional chain was observed where nuclei may through levels different other six registered so far. The cross section $^{240}\mathrm{Pu}$($^{48}\mathrm{Ca},3n$)$^{285}\mathrm{Fl}$ to be...