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NSR database version of April 11, 2024.

Search: Author = V.K.Utyonkov

Found 68 matches.

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2024WA14      Phys.Lett. B 850, 138503 (2024)

J.G.Wang, Z.G.Gan, Z.Y.Zhang, M.H.Huang, L.Ma, M.M.Zhang, H.B.Yang, C.L.Yang, Y.H.Qiang, X.Y.Huang, Z.Zhao, S.Y.Xu, Z.C.Li, L.X.Chen, L.C.Sun, H.Zhou, X.Zhang, X.L.Wu, Y.L.Tian, Y.S.Wang, J.Y.Wang, W.X.Huang, M.L.Liu, Z.W.Lu, Y.He, Z.Z.Ren, S.G.Zhou, X.H.Zhou, H.S.Xu, V.K.Utyonkov, A.A.Voinov, Yu.S.Tsyganov, A.N.Polyakov

α-decay properties of new neutron-deficient isotope 203Ac

RADIOACTIVITY 203Ac, 199Fr, 195At, 191Bi(α) [from 169Tm(40Ca, 6n)203Ac, E=226 MeV]; measured decay products, Eα, Iα; deduced α-particle energies, transitions T1/2, J, π, partial decay scheme, reduced α-decay widths, proton separation energies, the onset of deformation in neutron-deficient Ac isotopes. Comparison with systematics. The superconducting linear accelerator, China Accelerator Facility for superheavy Elements (CAFE2) at Institute of Modern Physics, Chinese Academy of Sciences.

doi: 10.1016/j.physletb.2024.138503
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2024ZH19      Phys.Rev. C 109, 034314 (2024)

Z.Zhao, Z.G.Gan, Z.Y.Zhang, J.G.Wang, M.H.Huang, L.Ma, H.B.Yang, M.M.Zhang, C.L.Yang, S.Y.Xu, X.Y.Huang, Z.C.Li, L.C.Sun, X.L.Wu, Y.S.Wang, Y.L.Tian, Y.H.Qiang, J.Y.Wang, W.X.Huang, Y.He, L.T.Sun, V.K.Utyonkov, A.A.Voinov, Yu.S.Tsyganov, A.N.Polyakov

Reinvestigation of the decay properties of 261, 262Bh at the gas-filled recoil separator SHANS2

doi: 10.1103/PhysRevC.109.034314
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2023IB01      Bull.Rus.Acad.Sci.Phys. 87, 1118 (2023)

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

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

RADIOACTIVITY 286,287Fl, 283Cn, 279Ds, 261Rf(α) [from 242Pu(48Ca, X), E=242.5, 247.5 MeV]; measured reaction products, Eα, Iα; deduced α-particle energies, T1/2, σ, 2+ rotational level in 282Cn. 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.

doi: 10.3103/S1062873823702945
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2023KO22      Bull.Rus.Acad.Sci.Phys. 87, 1098 (2023)

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

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

RADIOACTIVITY 286,287,288,289Mc(α), 268Db(SF), (α), 264Lr, 279Rg(SF) [from 243Am(48Ca, X), E=239-259 MeV]; measured decay products, Eα, Iα; deduced α-particle energies, branches, T1/2, σ. The new separator DGFRS-2 and cyclotron DC280 of the SHE Factory at FLNR JINR.

doi: 10.3103/S106287382370291X
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2023OG03      Phys.Rev. C 108, 024611 (2023)

Yu.Ts.Oganessian, V.K.Utyonkov, M.V.Shumeiko, F.Sh.Abdullin, S.N.Dmitriev, D.Ibadullayev, M.G.Itkis, N.D.Kovrizhnykh, D.A.Kuznetsov, O.V.Petrushkin, A.V.Podshibiakin, A.N.Polyakov, A.G.Popeko, I.S.Rogov, R.N.Sagaidak, L.Schlattauer, V.D.Shubin, D.I.Solovyev, Yu.S.Tsyganov, A.A.Voinov, V.G.Subbotin, N.S.Bublikova, M.G.Voronyuk, A.V.Sabelnikov, A.Yu.Bodrov, Z.G.Gan, Z.Y.Zhang, M.H.Huang, H.B.Yang

New isotope 276Ds and its decay products 272Hs and 268Sg from the 232Th+48Ca reaction

NUCLEAR REACTIONS 232Th(48Ca, 3n)277Ds, 232Th(48Ca, 4n)276Ds, E=231, 1, 237.8, 250.6 MeV; measured reaction products, Eα, Iα, fission fragments; deduced production σ(E). Systematics of production cross-sections with 48Ca beam on 242,244Pu, 238U, 232Th, 226Ra, 245,248Cm, 249Bk targets. Gas filled separator DGFRS-2 at the new cyclotron DC280 (SHE Factory, JINR).

RADIOACTIVITY 268Sg(SF)[from 232Th(48Ca, X), E=231, 1, 237.8, 250.6 MeV]; 272Hs(α)[from 232Th(48Ca, X), E=231, 1, 237.8, 250.6 MeV]; 276Ds(α), (SF)[from 232Th(48Ca, X), E=231, 1, 237.8, 250.6 MeV]; measured Eα, Iα, fission fragments; deduced T1/2, α-decay and SF decay branching and partial T1/2 for 276Ds, Q value for α-decay. Systematics of partial T1/2 for Hs, Ds, Cn, Fl, Lv and Og isotopes.

doi: 10.1103/PhysRevC.108.024611
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2022HU12      Phys.Lett. B 834, 137484 (2022)

M.H.Huang, Z.G.Gan, Z.Y.Zhang, L.Ma, J.G.Wang, M.M.Zhang, H.B.Yang, C.L.Yang, X.Y.Huang, Z.Zhao, S.Y.Xu, L.X.Chen, X.J.Wen, Y.F.Niu, C.X.Yuan, Y.L.Tian, Y.S.Wang, J.Y.Wang, M.L.Liu, Y.H.Qiang, W.Q.Yang, H.B.Zhang, Z.W.Lu, S.Guo, W.X.Huang, Y.He, Z.Z.Ren, S.G.Zhou, X.H.Zhou, H.S.Xu, V.K.Utyonkov, A.A.Voinov, Yu.S.Tsyganov, A.N.Polyakov

α decay of the new isotope 204Ac

RADIOACTIVITY 204,205Ac(α) [from 169Tm(40Ca, xn), E=202, 210, 212, 214 MeV using SHANS2 separator at CAFE2 and SHANS separator at HRIFL, Lanzhou accelerator facility]; 200Fr, 196At(α) [from 204Ac α-decay chain]; measured evaporation residues (ERs), Eα, (ER)α-α-α correlated events, production cross sections, T1/2 of decays using two multiwire proportional counters for implanted events, double-sided silicon strip detectors (DSSSDs) for α particles, and a segmented clover Ge detector for γ radiation. 204,205Ac, 200Fr, 196At; deduced T1/2 of decays of ground-state decays, and Eα values, reduced α-width in Rasmussen formalism, favored α decay for 204Ac decay. 204Ac(p); no proton decay events observed. 201,201m,202,202m,203,204,205Fr, 204,205,206Ra(α); observed α spectra, (ERs)-α-α-correlated events. Comparison with previous available experimental results. Systematics of experimental and theoretical T1/2 and Q(α) values for 196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211At, 198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213Fr, 203,204,205,206,207,208,209,210,211,212,213,214,215Ac, 211,212,213,214,215,216,217Pa, using Hartree-Fock-BCS (HFBSC) method, and macroscopic-microscopic (MM) mass formula for theory.

doi: 10.1016/j.physletb.2022.137484
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2022OG05      Phys.Rev. C 106, 024612 (2022)

Yu.Ts.Oganessian, V.K.Utyonkov, D.Ibadullayev, F.Sh.Abdullin, S.N.Dmitriev, M.G.Itkis, A.V.Karpov, N.D.Kovrizhnykh, D.A.Kuznetsov, O.V.Petrushkin, A.V.Podshibiakin, A.N.Polyakov, A.G.Popeko, R.N.Sagaidak, L.Schlattauer, V.D.Shubin, M.V.Shumeiko, D.I.Solovyev, Yu.S.Tsyganov, A.A.Voinov, V.G.Subbotin, A.Yu.Bodrov, A.V.Sabelnikov, A.Lindner, K.P.Rykaczewski, T.T.King, J.B.Roberto, N.T.Brewer, R.K.Grzywacz, Z.G.Gan, Z.Y.Zhang, M.H.Huang, H.B.Yang

Investigation of 48Ca-induced reactions with 242Pu and 238U targets at the JINR Superheavy Element Factory

RADIOACTIVITY 286,287Fl, 283Cn(α), (SF)[from 242Pu(48Ca, 3n), (48Ca, 4n)286Fl/287Fl, E=242.5, 247.5 MeV, and 238U(48Ca, 3n)283Cn, E=231.1, 234.4 MeV followed by separation of fragments using gas-filled separator DGFRS-2 separator at the SHE Factory of JINR-Dubna]; measured evaporation residues (ERs), Eα, fission fragments (SF), (ER)α-coin, αα-coin, (ER)(SF)-coin using double-sided silicon strip detectors (DSSDs), single-sided silicon-strip detectors (SSSDs) and multiwire proportional chambers (MWPCs); deduced T1/2 for α and SF decays, branching ratios, Q(α), production cross sections for superheavy nuclei. 279Ds, 275Hs, 271Sg(α), (SF); 282Cn, 267Rf(SF)[from 286,287Fl, 283Cn decay chains]; measured Eα, ESF deduced T1/2 for α and SF decays, average decay properties. 287Fl; discussed possible existence of isomeric states from consecutive α decays. 282Cn; discussed possible population of 2+ state. Comparison with previously available experimental results.

doi: 10.1103/PhysRevC.106.024612
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2022OG07      Phys.Rev. C 106, L031301 (2022)

Yu.Ts.Oganessian, V.K.Utyonkov, N.D.Kovrizhnykh, F.Sh.Abdullin, S.N.Dmitriev, D.Ibadullayev, M.G.Itkis, D.A.Kuznetsov, O.V.Petrushkin, A.V.Podshibiakin, A.N.Polyakov, A.G.Popeko, R.N.Sagaidak, L.Schlattauer, I.V.Shirokovski, V.D.Shubin, M.V.Shumeiko, D.I.Solovyev, Yu.S.Tsyganov, A.A.Voinov, V.G.Subbotin, A.Yu.Bodrov, A.V.Sabelnikov, A.V.Khalkin, V.B.Zlokazov, K.P.Rykaczewski, T.T.King, J.B.Roberto, N.T.Brewer, R.K.Grzywacz, Z.G.Gan, Z.Y.Zhang, M.H.Huang, H.B.Yang

First experiment at the Super Heavy Element Factory: High cross section of 288Mc in the 243Am + 48Ca reaction and identification of the new isotope 264Lr

NUCLEAR REACTIONS 243Am(48Ca, 2n)289Mc, (48Ca, 3n)288Mc, (48Ca, 4n), E=239.1, 240.9, 243.9 MeV; measured evaporation residues (ER), α, and fission fragments (SF), (ER)α-coin, αα-coin, α(SF)-coin, ER(SF)-coin, production σ(E) for superheavy nuclei using gas-filled separator DGFRS-2, two double-sided strip detectors (DSSD), two multiwire proportional chambers (MWPC) at the DC280 cyclotron facility of the Super Heavy Element Factory of JINR-Dubna.

RADIOACTIVITY 288,289Mc, 284,285Nh, 280,281Rg, 276Mt, 272Bh, 268Db(α); 281Rg, 277Mt, 268Db, 264Lr(SF)[from 243Am(48Ca, xn)]; measured Eα, ESF, (ER)α-coin, αα-coin, α(SF)-coin, ER(SF)-coin, T1/2. 268Db; deduced α/SF branching ratio. 264Lr; deduced new isotope, T1/2, average decay properties. 288Mc, 284Nh(EC), (β+); discussed upper limit for decay mode. History of 55 correlated events observed for 288Mc and six for 289Mc is listed by authors in the Supplemental material of the paper.

doi: 10.1103/PhysRevC.106.L031301
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2022OG08      Phys.Rev. C 106, 064306 (2022)

Yu.Ts.Oganessian, V.K.Utyonkov, N.D.Kovrizhnykh, F.Sh.Abdullin, S.N.Dmitriev, A.A.Dzhioev, D.Ibadullayev, M.G.Itkis, A.V.Karpov, D.A.Kuznetsov, O.V.Petrushkin, A.V.Podshibiakin, A.N.Polyakov, A.G.Popeko, I.S.Rogov, R.N.Sagaidak, L.Schlattauer, V.D.Shubin, M.V.Shumeiko, D.I.Solovyev, Yu.S.Tsyganov, A.A.Voinov, V.G.Subbotin, A.Yu.Bodrov, A.V.Sabelnikov, A.V.Khalkin, K.P.Rykaczewski, T.T.King, J.B.Roberto, N.T.Brewer, R.K.Grzywacz, Z.G.Gan, Z.Y.Zhang, M.H.Huang, H.B.Yang

New isotope 286Mc produced in the 243Am + 48Ca reaction

NUCLEAR REACTIONS 243Am(48Ca, X)288Mc/289Mc, 243Am(48Ca, 2n), (48Ca, 3n), (48Ca, 4n), (48Ca, 5n), E=242.2, 250.8, 259.1 MeV; measured reaction products, evaporation residues (ER), Eα, Iα, fission fragments, (SF), (SF)α-coin, (ER)α-coin, αα-coin; deduced σ(E) for superheavy nuclei production. Gas-filled separator DGFRS-2 at the DC280 cyclotron (SHE Factory at JINR). Measurements with double-sided silicon strip detectors (DSSDs), single-sided silicon-strip detectors (SSSDs) and multiwire proportional chambers (MWPCs).

RADIOACTIVITY 286,287,288Mc, 289Mc, 282Nh, 283Nh, 284Nh, 285Nh, 278,280Rg, 274,275,276Mt, 270,271,272Bh, 268Db(α); 279,281Rg, 266,267,268Db, 264Lr(SF) [from 243Am(48Ca, xn), E=E=242.2, 250.8, 259.1 MeV]; measured Eα, ESF; deduced T1/2. 268Db; deduced α/SF branching ratio. 286Mc; deduced new isotope. Comparison of deduced half-lives with theoretical predictions.

doi: 10.1103/PhysRevC.106.064306
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2022YA15      Phys.Rev. C 105, L051302 (2022)

H.B.Yang, Z.G.Gan, Z.Y.Zhang, M.H.Huang, L.Ma, M.M.Zhang, C.X.Yuan, Y.F.Niu, C.L.Yang, Y.L.Tian, L.Guo, Y.S.Wang, J.G.Wang, H.B.Zhou, X.J.Wen, H.R.Yang, X.H.Zhou, Y.H.Zhang, W.X.Huang, Z.Liu, S.G.Zhou, Z.Z.Ren, H.S.Xu, V.K.Utyonkov, A.A.Voinov, Yu.S.Tsyganov, A.N.Polyakov, D.I.Solovyev

New isotope 207Th and odd-even staggering in α-decay energies for nuclei with Z > 82 and N < 126

RADIOACTIVITY 207Th(α)[from 176Hf(36Ar, 5n), E=197-199 MeV]; 208Th(α)[from 176Hf(36Ar, 4n), E=197-199 MeV]; 203Ra, 199Rn, 195Po(α)[from 207Th α-decay chain]; 204Ra, 200Rn, 196Po(α)[from 208Th α-decay chain]; measured evaporation residues (ERs), Eα, and ER-α1234 correlated α-decay chain from the decays of 207Th and208Th. 207,208Th; deduced α-decay T1/2, production σ. Z=84-92, N=102-126; discussed systematics of experimental and theoretically calculated (by relativistic Hartree-Fock-Bogoliubov and large-scale shell-model approaches) odd-even staggering (OES) of Q(α), Q(proton) and Q(neutron). Position-sensitive silicon strip detectors (PSSDs), non-position sensitive Si detectors, and SHANS gas-filled recoil separator at the sector focusing cyclotron facility of HIRFL, Lanzhou.

doi: 10.1103/PhysRevC.105.L051302
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2022YA27      Phys.Rev. C 106, 064311 (2022)

H.B.Yang, Z.G.Gan, Z.Y.Zhang, M.H.Huang, L.Ma, M.M.Zhang, C.L.Yang, Y.L.Tian, Y.S.Wang, H.B.Zhou, X.J.Wen, J.G.Wang, Z.Zhao, S.Y.Xu, L.X.Chen, X.Y.Huang, C.X.Yuan, Y.F.Niu, H.R.Yang, W.X.Huang, Z.Liu, X.H.Zhou, Y.H.Zhang, S.G.Zhou, Z.Z.Ren, H.S.Xu, V.K.Utyonkov, A.A.Voinov, Yu.S.Tsyganov, A.N.Polyakov, D.I.Solovyev

Examining the impact of α-decay energies on the odd-even staggering in half-lives: α-decay spectroscopy of 207-209Ac

RADIOACTIVITY 207,208,208m,209Ac(α)[from 176Hf(36Ar, X), E=197-199 MeV]; measured evaporation residues (ER), Eα, Iα, αα-coin, (ER)αα-coin; deduced T1/2, Q values, decay branches. 204mFr(IT) [from 208Ac(α)]; deduced T1/2, isomer level energy, tentative J and π for the newly found 80-keV isomer. 204Fr(α)[from 208,208mAc(α)]; deduced T1/2. Found new α-decay branching 208Ac and assigned to the transition from ground state to the excited (2+, 4+) state. Comparison to the calculations performed in the framework of Wentzel-Kramers-Brillouin approximation. Spectrometer for Heavy Atoms and Nuclear Structure (SHANS) at Sector Focusing Cyclotron of the Heavy Ion Research Facility in Lanzhou (HIRFL).

doi: 10.1103/PhysRevC.106.064311
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2020VO07      Bull.Rus.Acad.Sci.Phys. 84, 351 (2020)

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

Synthesizing and Studying Superheavy Nuclei 294Ts and 294Og

doi: 10.3103/S1062873820040358
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2019ZL01      J.Phys.(London) G46, 018002 (2019)

V.B.Zlokazov, V.K.Utyonkov

Reply to Comment on 'Analysis of decay chains of superheavy nuclei produced in the 249Bk + 48Ca and 243Am + 48Ca reactions'

NUCLEAR REACTIONS 249Bk, 243Am(48Ca, X)293Ts, E not given; analyzed available data, question the validity of the methods and conclusions presented by Forsberg et al (2016 Nucl. Phys. A 953 117).

doi: 10.1088/1361-6471/aaf0cb
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2018BR13      Phys.Rev. C 98, 024317 (2018)

N.T.Brewer, V.K.Utyonkov, K.P.Rykaczewski, Yu.Ts.Oganessian, F.Sh.Abdullin, R.A.Boll, D.J.Dean, S.N.Dmitriev, J.G.Ezold, L.K.Felker, R.K.Grzywacz, M.G.Itkis, N.D.Kovrizhnykh, D.C.McInturff, K.Miernik, G.D.Owen, A.N.Polyakov, A.G.Popeko, J.B.Roberto, A.V.Sabelnikov, R.N.Sagaidak, I.V.Shirokovsky, M.V.Shumeiko, N.J.Sims, E.H.Smith, V.G.Subbotin, A.M.Sukhov, A.I.Svirikhin, Yu.S.Tsyganov, S.M.Van Cleve, A.A.Voinov, G.K.Vostokin, C.S.White, J.H.Hamilton, M.A.Stoyer

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a 48Ca beam

NUCLEAR REACTIONS 249,250,251,252Cf(48Ca, 2n), (48Ca, 3n), (48Ca, 4n), (48Ca, 5n), E*=33-50 MeV; calculated evaporation residual cross sections using from five models for analyzing reactions. 249,250,251Cf(48Ca, xn)294Og, E=252, 258 MeV; Yb(48Ca, xn)216Th/217Th/218Th/219Th/220Th, E=252, 258 MeV; 206Pb(48Ca, 2n)252No, E=252, 258 MeV; measured Eα, Iα and (implants)α correlations, using Dubna Gas Filled Recoil Separator (DGFRS) for recoil separation and double-sided silicon strip detectors for α detection at JINR. Reviewed earlier experiments from 2002 to 2012 for the detection of 294Og nuclide. 295,296Og; predicted production σ, half-life and Eα for the decay of 296Og; discussed future prospects for production of these two nuclides.

RADIOACTIVITY 294Og, 290Lv, 218,219Th, 214,215Ra(α); 286Fl(SF); measured Eα, Q(α) and T1/2. 294,296Og(α); comparison of experimental values for Q(α) and T1/2 for 294Og with theoretical predictions for 294Og and 296Og.

doi: 10.1103/PhysRevC.98.024317
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2018UT02      Phys.Rev. C 97, 014320 (2018)

V.K.Utyonkov, N.T.Brewer, Yu.Ts.Oganessian, K.P.Rykaczewski, F.Sh.Abdullin, S.N.Dmitriev, R.K.Grzywacz, M.G.Itkis, K.Miernik, A.N.Polyakov, J.B.Roberto, R.N.Sagaidak, I.V.Shirokovsky, M.V.Shumeiko, Yu.S.Tsyganov, A.A.Voinov, V.G.Subbotin, A.M.Sukhov, A.V.Karpov, A.G.Popeko, A.V.Sabelnikov, A.I.Svirikhin, G.K.Vostokin, J.H.Hamilton, N.D.Kovrizhnykh, L.Schlattauer, M.A.Stoyer, Z.Gan, W.X.Huang, L.Ma

Neutron-deficient superheavy nuclei obtained in the 240Pu + 48Ca reaction

NUCLEAR REACTIONS 240Pu(48Ca, 3n), (48Ca, 4n), E=250 MeV; measured evaporation residues (ER), α, and SF fragments, ER-α, α-α, and ER-SF correlated events, reaction σ using Dubna gas-filled recoil separator (DGFRS) at the U-400 cyclotron facility of Flerov Laboratory of Nuclear Reactions(FLNR), JINR; deduced three ER-α-SF correlated decay chains decaying from 285Fl to 265Rf, one ER-α-SF decay chain, and 25 short ER-SF decay chains, super-heavy nuclides (SHN). Systematics of production σ for Cf, Cm and Am isotopes in 248Cm, 249Cf(136Xe, xn), 248Cm(86Kr, xn), and 240Pu, 243Am, 248Cm(48Ca, xn) reactions. 240,244mAm, 242mAm, 237,239,241mPu, 238,241,243,244,245,246mAm, 287Fl, 282,283Cn, 279Ds; possible production of mostly the SF activities.

RADIOACTIVITY 285Fl, 281Cn, 277Ds, 273Hs, 269Sg(α); 265Rf(SF)[from 240Pu(48Ca, 3n), E=250 MeV]; measured Eα, ESF, T1/2 from three correlated decay chains; deduced average decay properties, possible indication of decays through different energy levels. 284Fl(SF)[from 240Pu(48Ca, 4n), E=250 MeV]; deduced possible three ER-SF correlated decay chains and estimated half-life.

doi: 10.1103/PhysRevC.97.014320
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2017AK02      Eur.Phys.J. A 53, 158 (2017)

N.V.Aksenov, P.Steinegger, F.Sh.Abdullin, Y.V.Albin, G.A.Bozhikov, V.I.Chepigin, R.Eichler, V.Ya.Lebedev, A.Sh.Madumarov, O.N.Malyshev, O.V.Petrushkin, A.N.Polyakov, Y.A.Popov, A.V.Sabelnikov, R.N.Sagaidak, I.V.Shirokovsky, M.V.Shumeiko, G.Ya.Starodub, Y.S.Tsyganov, V.K.Utyonkov, A.A.Voinov, G.K.Vostokin, A.V.Yeremin, S.N.Dmitriev

On the volatility of nihonium (Nh, Z = 113)

RADIOACTIVITY 288,289Mc(α)[from 243Am(48Ca, xn)]; measured Nh (Z=113) decay chains using Gas-Filled Recoil Separator with gas-phase chromatographic separation (JINR Dubna); deduced large retention of elemental Nh on teflon surface from non-observation of Nh decays.

doi: 10.1140/epja/i2017-12348-8
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2017ZL01      J.Phys.(London) G44, 075107 (2017)

V.B.Zlokazov, V.K.Utyonkov

Analysis of decay chains of superheavy nuclei produced in the 249Bk+48Ca and 243Am+48Ca reactions

RADIOACTIVITY 293Ts, 289Mc, 285Nh, 281Rg, 277Mt(α) [from 249Bk, 243Am(48Ca, X)]; analyzed available data; deduced a new statistical method for analysis of Q-values, T1/2.

doi: 10.1088/1361-6471/aa7293
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2015OG01      Rep.Prog.Phys. 78, 36301 (2015)

Y.T.Oganessian, V.K.Utyonkov

Super-heavy element research

doi: 10.1088/0034-4885/78/3/036301
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2015OG05      Nucl.Phys. A944, 62 (2015)

Yu.Ts.Oganessian, V.K.Utyonkov

Superheavy nuclei from 48Ca-induced reactions

doi: 10.1016/j.nuclphysa.2015.07.003
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2015UT02      Phys.Rev. C 92, 034609 (2015)

V.K.Utyonkov, N.T.Brewer, Yu.Ts.Oganessian, K.P.Rykaczewski, F.Sh.Abdullin, S.N.Dmitriev, R.K.Grzywacz, M.G.Itkis, K.Miernik, A.N.Polyakov, J.B.Roberto, R.N.Sagaidak, I.V.Shirokovsky, M.V.Shumeiko, Yu.S.Tsyganov, A.A.Voinov, V.G.Subbotin, A.M.Sukhov, A.V.Sabelnikov, G.K.Vostokin, J.H.Hamilton, M.A.Stoyer, S.Y.Strauss

Experiments on the synthesis of superheavy nuclei 284Fl and 285Fl in the 239, 240Pu + 48Ca reactions

NUCLEAR REACTIONS 240Pu(48Ca, 3n)285Fl, E=245, 250 MeV; 240Pu(48Ca, 4n)284Fl, E=245, 250 MeV; 239Pu(48Ca, 3n)284Fl, E=245 MeV; measured evaporation residues (ER), α, and SF fragments, ER-α and ER-SF correlated events, σ using DGFRS separator at U400 cyclotron facility of FLNR-JINR. Decay studies. Super heavy nuclei. Systematics of cross sections.

RADIOACTIVITY 284Fl(SF), 285Fl(α)[from 239,240Pu(48Ca, xn), E=245, 250 MeV]; 281Cn, 277Ds, 273Hs, 269Sg(α), 265Rf[from 285Fl α decay chain]; measured EER, Eα, ESF, T1/2; deduced Q(α). Systematics of SF half-lives and α-decay energies.

doi: 10.1103/PhysRevC.92.034609
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2013OG01      Phys.Rev. C 87, 014302 (2013)

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

Investigation of the 243Am + 48Ca reaction products previously observed in the experiments on elements 113, 115, and 117

NUCLEAR REACTIONS 243Am(48Ca, xn)287Mc/288Mc/289Mc, E=239.8-253.8 MeV; measured evaporation residues (ER), α, and SF fragments, ER-α and ER-SF correlated events, σ at U400 cyclotron facility of FLNR, JINR. 249Bk(48Ca, xn)293Ts/294Ts; 237Np(48Ca, 3n)282Nh; analyzed data.

RADIOACTIVITY 287,288,289Mc, 283,284,285Nh, 279,280Rg, 275,276Mt, 271,272Bh(α); 267,268Db, 281Rg(SF); measured T1/2. 293,297Ts, 290Mc, 282,286Nh, 278,282Rg, 274,278Mt, 270,274Bh(α); 266,270Db(SF); analyzed and compared previous half-life data.

doi: 10.1103/PhysRevC.87.014302
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2013OG03      Phys.Rev. C 87, 034605 (2013)

Yu.Ts.Oganessian, V.K.Utyonkov, F.Sh.Abdullin, S.N.Dmitriev, R.Graeger, R.A.Henderson, M.G.Itkis, Yu.V.Lobanov, A.N.Mezentsev, K.J.Moody, S.L.Nelson, A.N.Polyakov, M.A.Ryabinin, R.N.Sagaidak, D.A.Shaughnessy, I.V.Shirokovsky, M.A.Stoyer, N.J.Stoyer, V.G.Subbotin, K.Subotic, A.M.Sukhov, Yu.S.Tsyganov, A.Turler, A.A.Voinov, G.K.Vostokin, P.A.Wilk, A.Yakushev

Synthesis and study of decay properties of the doubly magic nucleus 270Hs in the 226Ra + 48Ca reaction

NUCLEAR REACTIONS 226Ra(48Ca, 4n)270Hs, E=229, 234, 241 MeV; measured reaction products, σ(E), ER-α correlations using U400 cyclotron and Dubna gas-filled recoil separator at FLNR, JINR facility. Relatively high production cross section due to high fission barrier arising from nuclear shell effects.

RADIOACTIVITY 270Hs(α)[from 226Ra(48Ca, 4n), E=229, 234, 241 MeV]; 266Sg(SF)[from 270Hs α decay]; measured Eα, evaporation residues-α correlations, T1/2. Comparison with previous studies. Systematics of α decay and SF half-lives for N=148-172 No, Rf, Sg, and Hs nuclei.

doi: 10.1103/PhysRevC.87.034605
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2013OG04      Phys.Rev. C 87, 054621 (2013)

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

Experimental studies of the 249Bk+48Ca reaction including decay properties and excitation function for isotopes of element 117, and discovery of the new isotope 277Mt

NUCLEAR REACTIONS 249Bk(48Ca, 3n), (48Ca, 4n), E=243.7, 255.7, 259.8 MeV; measured σ(E) for production of 293,294Ts using DGFRS separator at FLNR, JINR facility. Comparison with theoretical calculations.

RADIOACTIVITY 293,294Ts, 289,290Mc, 285,286Nh, 281,282Rg, 278Mt, 274Bh(α)[from α decay chains of 293Ts and 294Ts formed in 249Bk(48Ca, 3n), (48Ca, 4n), E=243.7, 255.7, 259.8 MeV]; measured Eα, Iα, half-lives. 270Db, 277Mt, 281Rg(SF); measured decay energy, half-lives. 281Rg(α), (SF); measured α/SF branching ratio. 277Mt; identified new isotope. Systematics of Q(α), SF- and α-decay half-lives for isotopes in Z=104-117, N=150-177 regions.

doi: 10.1103/PhysRevC.87.054621
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2012OG02      Phys.Rev.Lett. 108, 022502 (2012)

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

New Insights into the 243Am+48Ca Reaction Products Previously Observed in the Experiments on Elements 113, 115, and 117

NUCLEAR REACTIONS 243Am(48Ca, 3n)288Mc, E=240 MeV; 243Am, 249Bk(48Ca, X)289Mc, E not given; measured reaction products. 291Mc, 291Mc, 297Ts; deduced σ. Comparison with other data.

RADIOACTIVITY 288Mc, 284Nh, 280Rg, 276Mt, 272Bh(α), 268Db(SF); 289Mc, 285Nh, 281Rg(α); 293Ts, 289Mc, 285Nh, 281Rg(α); measured decay products, Eα, Iα; deduced decay chains, strong support for the elements of 113 and 115.

doi: 10.1103/PhysRevLett.108.022502
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2012OG06      Phys.Rev.Lett. 109, 162501 (2012)

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

Production and Decay of the Heaviest Nuclei 293, 294117 and 294118

NUCLEAR REACTIONS 249Bk(48Ca, X)293Ts/294Ts, E=247, 252 MeV; 249Cf(48Ca, 3n)294Og, E=245, 251 MeV; measured reaction products, Eα, Iα; deduced average σ, T1/2. Comparison with available data.

RADIOACTIVITY 294Og, 293,294Ts, 290Lv, 289,290Mc(α), 286Fl(α), (SF), 285,286Nh(α), 282Cn(SF), 281Rg(SF), 282Rg(α), 278Mt, 274Bh(α), 270Db(SF); measured decay products, Eα, Iα; deduced discovery z=117 element, T1/2, decay branch, Q-values. Comparison with available data.

doi: 10.1103/PhysRevLett.109.162501
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2011HA63      J.Phys.:Conf.Ser. 312, 082026 (2011)

J.H.Hamilton, Yu.Ts.Oganessian, F.Sh.Abdullin, P.D.Bailey, D.Benker, M.E.Bennett, S.N.Dmitriev, J.Ezold, R.A.Henderson, M.G.Itkis, Yu.V.Lobanov, A.N.Mezentsev, K.J.Moody, S.L.Nelson, A.N.Polyakov, C.E.Porter, A.V.Ramayya, F.Riley, J.B.Roberto, M.A.Ryabinin, K.P.Rykaczewski, R.N.Sagaidak, D.A.Shaughnessy, I.V.Shirokovsky, M.A.Stoyer, V.G.Subbotin, R.Sudowe, A.M.Sukhov, Tu.S.Tsyganov, V.K.Utyonkov, A.A.Voinov, G.K.Vostokin, P.A.Wilk

Synthesis of the New Element with Z=117

NUCLEAR REACTIONS 249Bk(48Ca, 4n)293Ts, E=252 MeV;249Bk(48Ca, 3n)294Ts, E=252 MeV; measured Eα, α-decay chains, ER, fission fragments; deduced new element 117, T1/2.

doi: 10.1088/1742-6596/312/4/082026
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2011OG04      Phys.Rev. C 83, 054315 (2011)

Yu.Ts.Oganessian, F.Sh.Abdullin, P.D.Bailey, D.E.Benker, M.E.Bennett, S.N.Dmitriev, J.G.Ezold, J.H.Hamilton, R.A.Henderson, M.G.Itkis, Yu.V.Lobanov, A.N.Mezentsev, K.J.Moody, S.L.Nelson, A.N.Polyakov, C.E.Porter, A.V.Ramayya, F.D.Riley, J.B.Roberto, M.A.Ryabinin, K.P.Rykaczewski, R.N.Sagaidak, D.A.Shaughnessy, I.V.Shirokovsky, M.A.Stoyer, V.G.Subbotin, R.Sudowe, A.M.Sukhov, R.Taylor, Yu.S.Tsyganov, V.K.Utyonkov, A.A.Voinov, G.K.Vostokin, P.A.Wilk

Eleven new heaviest isotopes of elements Z = 105 to Z = 117 identified among the products of 249Bk+48Ca reactions

RADIOACTIVITY 293,294Ts(α)[from 249Bk(48Ca, xn), E=252 MeV]; 274Bh, 278Mt, 282Rg, 286Nh, 290Mc(α) [from α decay chain of 294Ts]; 281Rg, 285Nh, 289Mc(α)[from α decay chain of 293Ts]; 270Db(SF), (α), (EC)[from α decay of 274Bh]; 281Rg(SF)[from α decay of 285Nh]; measured Eα, half-lives and β decay energies of residues; deduced Q(α). Systematics of α decay half-lives, Q(α) values and β+, EC half-lives of Z=106-118, N=150-175, A=260-295 isotopes.

NUCLEAR REACTIONS 249Bk(48Ca, xn)293Ts/294Ts, E=252 MeV; measured production cross sections.

doi: 10.1103/PhysRevC.83.054315
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2010OG01      Phys.Rev.Lett. 104, 142502 (2010)

Yu.Ts.Oganessian, F.Sh.Abdullin, P.D.Bailey, D.E.Benker, M.E.Bennett, S.N.Dmitriev, J.G.Ezold, J.H.Hamilton, R.A.Henderson, M.G.Itkis, Yu.V.Lobanov, A.N.Mezentsev, K.J.Moody, S.L.Nelson, A.N.Polyakov, C.E.Porter, A.V.Ramayya, F.D.Riley, J.B.Roberto, M.A.Ryabinin, K.P.Rykaczewski, R.N.Sagaidak, D.A.Shaughnessy, I.V.Shirokovsky, M.A.Stoyer, V.G.Subbotin, R.Sudowe, A.M.Sukhov, Yu.S.Tsyganov, V.K.Utyonkov, A.A.Voinov, G.K.Vostokin, P.A.Wilk

Synthesis of a New Element with Atomic Number Z = 117

NUCLEAR REACTIONS 249Bk(48Ca, 4n), E=252 MeV; 249Bk(48Ca, 3n) , E=247 MeV;measured Eα, Iα, α-α correlations. 293,294Ts; deduced σ, decay chains, T1/2.

RADIOACTIVITY 293,294Ts, 289,290Mc, 285,286Nh, 282Rg, 278Mt, 274Bh(α); measured Eα, Iα, and half-lives. 270Db, 281Rg(SF); measured TKE, and T1/2.

doi: 10.1103/PhysRevLett.104.142502
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2010WI14      Nucl.Instrum.Methods Phys.Res. B268, 28 (2010)

D.Wittwer, F.Sh.Abdullin, N.V.Aksenov, Yu.V.Albin, G.A.Bozhikov, S.N.Dmitriev, R.Dressler, R.Eichler, H.W.Gaggeler, R.A.Henderson, S.Hubener, J.M.Kenneally, V.Ya.Lebedev, Yu.V.Lobanov, K.J.Moody, Yu.Ts.Oganessian, O.V.Petrushkin, A.N.Polyakov, D.Piguet, P.Rasmussen, R.N.Sagaidak, A.Serov, I.V.Shirokovsky, D.A.Shaughnessy, S.V.Shishkin, A.M.Sukhov, M.A.Stoyer, N.J.Stoyer, E.E.Tereshatov, Yu.S.Tsyganov, V.K.Utyonkov, G.K.Vostokin, M.Wegrzecki, P.A.Wilk

Gas phase chemical studies of superheavy elements using the Dubna gas-filled recoil separator - Stopping range determination

RADIOACTIVITY 289Fl, 285Cn(α) [from 244Pu(48Ca, 3n)289Fl, E=265 MeV]; measured decay products, Eα, Iα; deduced α-decay chains.

doi: 10.1016/j.nimb.2009.09.062
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2009OG02      Phys.Rev. C 79, 024603 (2009)

Yu.Ts.Oganessian, V.K.Utyonkov, Yu.V.Lobanov, F.Sh.Abdullin, A.N.Polyakov, R.N.Sagaidak, I.V.Shirokovsky, Yu.S.Tsyganov, A.A.Voinov, A.N.Mezentsev, V.G.Subbotin, A.M.Sukhov, K.Subotic, V.I.Zagrebaev, S.N.Dmitriev, R.A.Henderson, K.J.Moody, J.M.Kenneally, J.H.Landrum, D.A.Shaughnessy, M.A.Stoyer, N.J.Stoyer, P.A.Wilk

Attempt to produce element 120 in the 244Pu+58Fe reaction

NUCLEAR REACTIONS 244Pu(58Fe, xn)298120/299120, E=330.4 MeV;measured α-particle spectra, (evaporation residues)α-coin, and upper limit of production cross section for Z=120 element. No decay chains for 298120 and 299120 were observed.

doi: 10.1103/PhysRevC.79.024603
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2007OG02      Phys.Rev. C 76, 011601 (2007)

Yu.Ts.Oganessian, V.K.Utyonkov, Yu.V.Lobanov, F.Sh.Abdullin, A.N.Polyakov, R.N.Sagaidak, I.V.Shirokovsky, Yu.S.Tsyganov, A.A.Voinov, G.G.Gulbekian, S.L.Bogomolov, B.N.Gikal, A.N.Mezentsev, V.G.Subbotin, A.M.Sukhov, K.Subotic, V.I.Zagrebaev, G.K.Vostokin, M.G.Itkis, R.A.Henderson, J.M.Kenneally, J.H.Landrum, K.J.Moody, D.A.Shaughnessy, M.A.Stoyer, N.J.Stoyer, P.A.Wilk

Synthesis of the isotope 282113 in the 237Np+48Ca fusion reaction

NUCLEAR REACTIONS 237Np(48Ca, 3n)282Nh, E=244 MeV; measured Eα, production cross section and T1/2.

doi: 10.1103/PhysRevC.76.011601
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2007ST18      Nucl.Phys. A787, 388c (2007)

N.J.Stoyer, J.H.Landrum, P.A.Wilk, K.J.Moody, J.M.Kenneally, D.A.Shaughnessy, M.A.Stoyer, J.F.Wild, R.W.Lougheed, S.N.Dmitriev, Yu.Ts.Oganessian, S.V.Shishkin, N.V.Aksenov, E.E.Tereshatov, G.A.Bozhikov, G.K.Vostokin, V.K.Utyonkov, A.A.Yeremin

Chemical Identification of a Long-Lived Isotope of Dubnium, a Descendant of Element 115

NUCLEAR REACTIONS 238U(48Ca, 3n), E=247 MeV; measured super heavy element yield, Eα, Iα; analyzed production σ. Detailed chemical analysis procedure given.

NUCLEAR STRUCTURE 268Db, 272Bh, 276Mt, 280Rg, 284Nh, 288Mc; analyzed superheavy element production and decay data.

RADIOACTIVITY 268Db(SF); 272Bh, 276Mt, 280Rg, 284Nh, 288Mc(α); measured Eα, E(fragment), T1/2.

doi: 10.1016/j.nuclphysa.2006.12.060
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2006OG05      Phys.Rev. C 74, 044602 (2006)

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

Synthesis of the isotopes of elements 118 and 116 in the 249Cf and 245Cm + 48Ca fusion reactions

NUCLEAR REACTIONS 245Cm(48Ca, 2n), (48Ca, 3n), E=249, 255 MeV; 249Cf(48Ca, 3n), E=251 MeV; measured Eα, αα-coin, fission fragment spectra following residual nucleus decay; deduced σ.

RADIOACTIVITY 294Og, 290,291Lv, 286,287Fl, 283Cn, 279Ds, 275Hs, 271Sg(α) [from 245Cm, 249Cf(48Ca, xn) and subsequent decay]; measured Eα, T1/2. 282Cn, 267Rf(SF) [from α-decay of 286Rf and 271Sg]; measured fission fragment spectra, T1/2.

doi: 10.1103/PhysRevC.74.044602
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2005DM03      Mendeleev Commun. 15, 1 (2005)

S.N.Dmitriev, Y.T.Oganessyan, V.K.Utyonkov, S.V.Shishkin, A.V.Yeremin, Y.V.Lobanov, Y.S.Tsyganov, V.I.Chepygin, E.A.Sokol, G.K.Vostokin, N.V.Aksenov, M.Hussonnois, M.G.Itkis, H.W.Gaggeler, D.Schumann, H.Bruchertseifer, R.Eichler, D.A.Shaughnessy, P.A.Wilk, J.M.Kenneally, M.A.Stoyer, J.F.Wild

Chemical identification of dubnium as a decay product of element 115 produced in the reaction 48Ca + 243Am

NUCLEAR REACTIONS 243Am(48Ca, 3n), E=247 MeV; measured super heavy element yield, Eα, Iα; analyzed production σ. Radiochemical experiment, identification of the long-lived decay product dubnium.

NUCLEAR STRUCTURE 268Db, 272Bh, 276Mt, 280Rg, 284Nh, 288Mc; analyzed superheavy element production and decay data.

RADIOACTIVITY 268Db(SF); 272Bh, 276Mt, 280Rg, 284Nh, 288Mc(α); measured Eα, E(fragment), T1/2.

doi: 10.1070/MC2005v015n01ABEH002077
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2005OG02      Phys.Rev. C 72, 034611 (2005)

Yu.Ts.Oganessian, V.K.Utyonkov, S.N.Dmitriev, Yu.V.Lobanov, M.G.Itkis, A.N.Polyakov, Yu.S.Tsyganov, A.N.Mezentsev, A.V.Yeremin, A.A.Voinov, E.A.Sokol, G.G.Gulbekian, S.L.Bogomolov, S.Iliev, V.G.Subbotin, A.M.Sukhov, G.V.Buklanov, S.V.Shishkin, V.I.Chepigin, G.K.Vostokin, N.V.Aksenov, M.Hussonnois, K.Subotic, V.I.Zagrebaev, K.J.Moody, J.B.Patin, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, P.A.Wilk, R.W.Lougheed, H.W.Gaggeler, D.Schumann, H.Bruchertseifer, R.Eichler

Synthesis of elements 115 and 113 in the reaction 243Am + 48Ca

NUCLEAR REACTIONS 243Am(48Ca, 3n), (48Ca, 4n), E=248, 253 MeV; measured delayed Eα, αα-coin; deduced σ.

RADIOACTIVITY 287,288Mc, 283,284Nh, 279,280Rg, 275,276Mt, 272Bh(α) [from 243Am(48Ca, xn) and subsequent decay]; measured Eα, T1/2; deduced Qα. 267,268Db(SF); measured T1/2.

doi: 10.1103/PhysRevC.72.034611
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2005OG03      Eur.Phys.J. A 25, Supplement 1, 589 (2005)

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, A.A.Voinov, G.V.Buklanov, K.Subotic, V.I.Zagrebaev, M.G.Itkis, J.B.Patin, K.J.Moody, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, P.A.Wilk, R.W.Lougheed

New elements from Dubna

NUCLEAR REACTIONS 238U(48Ca, 3n), (48Ca, 4n), 233U, 242Pu(48Ca, 2n), (48Ca, 3n), (48Ca, 4n), E ≈ 230-250 MeV; measured σ.

RADIOACTIVITY 294Og, 290,291,292,293Lv, 287,288,289Fl, 285Cn, 275Hs(α); 286Fl, 283Cn, 279Ds, 271Sg(α), (SF);282,284Cn, 281Ds, 267Rf(SF); measured Eα, T1/2, branching ratios.

doi: 10.1140/epjad/i2005-06-134-9
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2005ST38      Eur.Phys.J. A 25, Supplement 1, 595 (2005)

M.A.Stoyer, J.B.Patin, J.M.Kenneally, K.J.Moody, D.A.Shaughnessy, N.J.Stoyer, J.F.Wild, P.A.Wilk, V.K.Utyonkov, Yu.Ts.Oganessian

Random probability analysis of recent 48Ca experiments

NUCLEAR REACTIONS 245Cm(48Ca, 2n), 242,244Pu, 243Am, 245Cm, 249Cf(48Ca, 3n), 242,244Pu(48Ca, 4n), 244Pu(48Ca, 5n), E not given; calculated probabilities for random event observation.

doi: 10.1140/epjad/i2005-06-125-x
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2004OG03      Phys.Rev. C 69, 021601 (2004); Erratum Phys.Rev. C 69, 029902 (2004)

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, A.N.Mezentsev, S.Iliev, V.G.Subbotin, A.M.Sukhov, A.A.Voinov, G.V.Buklanov, K.Subotic, V.I.Zagrebaev, M.G.Itkis, J.B.Patin, K.J.Moody, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, R.W.Lougheed

Experiments on the synthesis of element 115 in the reaction 243Am(48Ca, xn)291-x115

NUCLEAR REACTIONS 243Am(48Ca, 3n), (48Ca, 4n), E=253 MeV; measured (recoil)α-, αα-coin following residual nucleus decay; deduced production σ.

RADIOACTIVITY 287,288Mc, 283,284Nh, 279,280Rg, 275,276Mt, 272Bh(α) [from 243Am(48Ca, xn) and subsequent decay]; measured Eα, T1/2; deduced Qα. 267,268Db(SF) [from 243Am(48Ca, xn) and subsequent decay]; measured T1/2. Comparison with model predictions.

doi: 10.1103/PhysRevC.69.021601
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2004OG05      Nucl.Phys. A734, 109 (2004)

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, A.A.Voinov, G.V.Buklanov, K.Subotic, V.I.Zagrebaev, M.G.Itkis, J.B.Patin, K.J.Moody, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, R.W.Lougheed

Heavy Element Research at Dubna

NUCLEAR REACTIONS 245Cm(48Ca, xn), E*=33 MeV; measured Eα, αα-, (fission fragment)α-coin following residual nucleus decay; deduced evidence for 290,291Lv. 244Pu(48Ca, xn), E*=31-53 MeV; measured evaporation residue excitation functions. Studies of other reactions and nuclides reviewed.

doi: 10.1016/j.nuclphysa.2004.01.020
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2004OG07      Phys.Rev. C 69, 054607 (2004)

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, A.A.Voinov, G.V.Buklanov, K.Subotic, V.I.Zagrebaev, M.G.Itkis, J.B.Patin, K.J.Moody, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, R.W.Lougheed

Measurements of cross sections for the fusion-evaporation reactions 244Pu(48Ca, xn)292-x114 and 245Cm(48Ca, xn)293-x116

NUCLEAR REACTIONS 244Pu(48Ca, 3n), (48Ca, 4n), (48Ca, 5n), E=243-257 MeV; 245Cm(48Ca, 2n), (48Ca, 3n), E=243 MeV; measured production σ.

RADIOACTIVITY 290,291Lv, 286,287,288,289Fl, 283,285Cn(α) [from 244Pu, 245Cm(48Ca, xn) and subsequent decay]; measured Eα, T1/2. 282,284Cn, 279,281Ds(SF); measured fission energy, T1/2.

doi: 10.1103/PhysRevC.69.054607
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2004OG10      Prog.Theor.Phys.(Kyoto), Suppl. 154, 406 (2004)

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, A.A.Voinov, G.V.Buklanov, K.Subotic, V.I.Zagrebaev, M.G.Itkis, K.J.Moody, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, J.B.Patin, R.W.Lougheed

Synthesis of Superheavy Nuclei in 48Ca-Induced Reactions

NUCLEAR REACTIONS 244Pu(48Ca, 3n), (48Ca, 4n), (48Ca, 5n), E* ≈ 30-55 MeV; measured excitation functions.

RADIOACTIVITY 290,291Lv, 287,288Mc, 286,287,288,289Fl, 283,284Nh, 283,285Cn, 279,280Rg, 275,276Mt, 272Bh(α); 286Fl, 282,284Cn, 279,281Ds(SF); 294Og(α), (SF); measured Eα, T1/2.

doi: 10.1143/PTPS.154.406
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2004OG12      Phys.Rev. C 70, 064609 (2004); Erratum Phys.Rev. C 71, 029902 (2005)

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, A.A.Voinov, G.V.Buklanov, K.Subotic, V.I.Zagrebaev, M.G.Itkis, J.B.Patin, K.J.Moody, J.F.Wild, M.A.Stoyer, N.J.Stoyer, D.A.Shaughnessy, J.M.Kenneally, P.A.Wilk, R.W.Lougheed, R.I.Ilkaev, S.P.Vesnovskii

Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactions 233, 238U, 242Pu, and 248Cm + 48Ca

NUCLEAR REACTIONS 233,238U, 242Pu, 248Cm(48Ca, 2n), (48Ca, 3n), (48Ca, 4n), (48Ca, 5n), E* ≈ 25-55 MeV; measured excitation functions. Comparison with model predictions.

RADIOACTIVITY 271Sg, 275Hs, 279Ds, 282,283,285Cn, 286,287,288,289Fl, 292,293Lv(α); 267Rf, 271Sg, 279,281Ds, 284Cn, 286Fl(SF) [from 233,238U, 242Pu, 248Cm(48Ca, xn) and subsequent decay]; measured Eα, T1/2. Comparison with model predictions.

doi: 10.1103/PhysRevC.70.064609
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2002OG09      Eur.Phys.J. A 15, 201 (2002)

Y.T.Oganessian, V.K.Utyonkov, Y.V.Lobanov, F.S.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

Synthesis of superheavy nuclei in the reactions of 244Pu and 248Cm with 48Ca

NUCLEAR REACTIONS 248Cm(48Ca, 4n), E=240 MeV; 244Pu(48Ca, 4n), (48Ca, 3n), E=236 MeV; measured delayed Eα, αα-coin.

RADIOACTIVITY 292Lv, 288,289Fl, 284,285Cn, 281Ds(α) [from 248Cm, 244Pu(48Ca, xn) and subsequent decay]; measured Eα, T1/2.

doi: 10.1140/epja/i2001-10254-4
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2002SU35      Nucl.Instrum.Methods Phys.Res. A481, 71 (2002)

K.Subotic, Yu.Ts.Oganessian, V.K.Utyonkov, Yu.V.Lobanov, F.Sh.Abdullin, A.N.Polyakov, Yu.S.Tsyganov, O.V.Ivanov

Evaporation residue collection efficiencies and position spectra of the Dubna gas-filled recoil separator

NUCLEAR REACTIONS 206Pb(48Ca, 2n), 186W(34S, 4n), E not given; measured yields, focal-plane position spectra in recoil separator.

doi: 10.1016/S0168-9002(01)01367-5
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2001OG01      Phys.Rev. C63, 011301 (2001)

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, M.G.Itkis, K.J.Moody, J.F.Wild, N.J.Stoyer, M.A.Stoyer, R.W.Lougheed, C.A.Laue, Ye.A.Karelin, A.N.Tatarinov

Observation of the Decay of 292116

NUCLEAR REACTIONS 248Cm(48Ca, 4n), E=240 MeV; measured Eα, (recoil)α-, αα-coin; deduced evidence for 296Lv, 288Fl, 284Cn, 280Ds.

RADIOACTIVITY 292Lv, 288Fl, 284Cn(α); 280Ds(SF) [From 248Cm(48Ca, 4n), E=240 MeV, and subsequent decay]; measured Eα, T1/2.

doi: 10.1103/PhysRevC.63.011301
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2001OG02      Nucl.Phys. A682, 108c (2001)

Yu.Ts.Oganessian, M.G.Itkis, A.G.Popeko, V.K.Utyonkov, A.V.Yeremin

Synthesis of Superheavy Elements with 48Ca Beams

doi: 10.1016/S0375-9474(00)00628-X
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2001OG06      Yad.Fiz. 64, No 8, 1427 (2001); Phys.Atomic Nuclei 64, 1349 (2001)

Yu.Ts.Oganessian, V.K.Utyonkov, K.J.Moody

Synthesis of 292116 in the 248Cm + 48Ca Reaction

NUCLEAR REACTIONS 248Cm(48Ca, 4n), E=240 MeV; measured delayed Eα, (recoil)α-, αα-coin; deduced evidence for 292Lv.

RADIOACTIVITY 292Lv, 288Fl, 284Cn(α) [from 248Cm(48Ca, 4n) and subsequent decay]; measured Eα, T1/2.

doi: 10.1134/1.1398925
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2001OG08      Phys.Rev. C64, 054606 (2001)

Yu.Ts.Oganessian, V.K.Utyonkov, Yu.V.Lobanov, F.Sh.Abdullin, A.N.Polyakov, I.V.Shirokovsky, Yu.S.Tsyganov, A.N.Mezentsev, S.Iliev, V.G.Subbotin, A.M.Sukhov, K.Subotic, O.V.Ivanov, A.N.Voinov, V.I.Zagrebaev, K.J.Moody, J.F.Wild, N.J.Stoyer, M.A.Stoyer, R.W.Lougheed

Measurements of Cross Sections for the Fusion-Evaporation Reactions 204, 206, 207, 208Pb + 48Ca and 207Pb + 34S: Decay properties of the even-even nuclides 238Cf and 250No

NUCLEAR REACTIONS 206Pb(48Ca, n), (48Ca, 2n), (48Ca, 3n), (48Ca, 4n), E=214-243 MeV; 204,207,208Pb(48Ca, 2n), E=213-220 MeV; 207Pb(34S, 3n), E=160-180 MeV; measured σ. Recoil separator. Comparison with model predictions.

RADIOACTIVITY 250No(SF) [from 204,206Pb(48Ca, xn)]; measured T1/2.

doi: 10.1103/PhysRevC.64.054606
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2001OG09      Phys.Rev. C64, 064309 (2001)

Yu.Ts.Oganessian, V.K.Utyonkov, Yu.V.Lobanov, F.Sh.Abdullin, A.N.Polyakov, I.V.Shirokovsky, Yu.S.Tsyganov, A.N.Mezentsev, S.Iliev, V.G.Subbotin, A.M.Sukhov, G.V.Buklanov, K.Subotic, Yu.A.Lazarev, K.J.Moody, J.F.Wild, N.J.Stoyer, M.A.Stoyer, R.W.Lougheed, C.A.Laue

Average Charge States of Heavy Atoms in Dilute Hydrogen

ATOMIC PHYSICS Z=89-116; measured average charge states of ions vs velocity in gas-filled recoil separator. Application to synthesis of superheavy nuclei discussed.

doi: 10.1103/PhysRevC.64.064309
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2000LA34      Phys.Rev. C62, 064307 (2000)

Yu.A.Lazarev, Yu.V.Lobanov, Yu.Ts.Oganessian, V.K.Utyonkov, F.Sh.Abdullin, A.N.Polyakov, J.Rigol, I.V.Shirokovsky, Yu.S.Tsyganov, S.Iliev, V.G.Subbotin, A.M.Sukhov, G.V.Buklanov, A.N.Mezentsev, K.Subotic, K.J.Moody, N.J.Stoyer, J.F.Wild, R.W.Lougheed

Decay Properties of 257No, 261Rf, and 262Rf

NUCLEAR REACTIONS 244Pu(22Ne, 4n), (22Ne, 5n), E=114, 120 MeV; 242Pu(22Ne, 4n), (22Ne, 5n), E=114 MeV; 238U(26Mg, 4n), (26Mg, 5n), E=134, 140 MeV; measured Eα, αα-coin following residual nucleus decay; deduced production σ.

RADIOACTIVITY 261,262Rf, 257No(α) [from 244Pu(22Ne, xn) and subsequent decay]; measured Eα, T1/2.

doi: 10.1103/PhysRevC.62.064307
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2000OG05      Phys.Rev. C62, 041604 (2000)

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, M.G.Itkis, K.J.Moody, J.F.Wild, N.J.Stoyer, M.A.Stoyer, R.W.Lougheed

Synthesis of Superheavy Nuclei in the 48Ca + 244Pu Reaction: 288114

NUCLEAR REACTIONS 244Pu(48Ca, 4n), E ≈ 236 MeV; measured Eα, αα-coin following residual nucleus decay, production σ; deduced evidence for 288Fl, 284Cn, 280Ds.

RADIOACTIVITY 288Fl, 284Cn(α); 280Ds(SF) [from 244Pu(48Ca, 4n) and subsequent decay]; measured Eα, T1/2. Comparison with model predictions.

doi: 10.1103/PhysRevC.62.041604
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2000OG07      Yad.Fiz. 63, No 10, 1769 (2000); Phys.Atomic Nuclei 63, 1679 (2000)

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, M.G.Itkis, K.J.Moody, J.F.Wild, N.J.Stoyer, M.A.Stoyer, R.W.Lougheed

Synthesis of Superheavy Nuclei in 48Ca + 244Pu Interactions

NUCLEAR REACTIONS 244Pu(48Ca, 3n), (48Ca, 4n), E ≈ 236 MeV; 248Cm(48Ca, 4n), E not given; measured Eα, fission fragments, (recoil)α-, αα-coin following residual nucleus decay; deduced evidence for 292Lv, 288,289Fl, 284,285Cn, 280,281Ds, 277Hs.

RADIOACTIVITY 292Lv, 288,289Fl, 284,285Cn, 281Ds(α); 280Ds, 277Hs(SF) [from 244Pu, 248Cm(48Ca, xn) and subsequent decay ]; measured Eα, T1/2.

doi: 10.1134/1.1320137
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2000ST30      Nucl.Instrum.Methods Phys.Res. A455, 433 (2000)

N.J.Stoyer, M.A.Stoyer, J.F.Wild, K.J.Moody, R.W.Lougheed, Yu.Ts.Oganessian, V.K.Utyonkov

Random Probability Analysis of Heavy-Element Data

RADIOACTIVITY 289Fl(α); analyzed Eα, αα-coin; deduced background features. Monte Carlo random probability method, Geiger-Nuttall criteria. Comparisons with other approaches.

doi: 10.1016/S0168-9002(00)00503-9
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1999OG02      Acta Phys.Slovaca 49, 65 (1999)

Yu.Ts.Oganessian, A.V.Yeremin, V.I.Chepigin, M.G.Itkis, A.P.Kabachenko, O.Konstantinesky, M.Konstantinesky, O.N.Malyshev, A.G.Popeko, J.Rohac, R.N.Sagaidak, I.V.Shirokovsky, V.K.Utyonkov, S.Hofmann, G.Munzenberg, M.Veselsky, S.Saro, N.Iwasa, K.Morita, A.Yoneda, M.Hussonnois

Experiments on the Synthesis of Superheavy Elements with Z = 110, 112 via 232Th, 238U + 48Ca Reactions

NUCLEAR REACTIONS 232Th(48Ca, X), E=260 MeV; 238U(48Ca, X), E=231, 238 MeV measured residuals α-decay, spontaneous fission; deduced evidence for 277Ds, 283Cn. 283Cn deduced T1/2.


1999OG10      Phys.Rev.Lett. 83, 3154 (1999)

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, G.V.Buklanov, K.Subotic, M.G.Itkis, K.J.Moody, J.F.Wild, N.J.Stoyer, M.A.Stoyer, R.W.Lougheed

Synthesis of Superheavy Nuclei in the 48Ca + 244Pu Reaction

NUCLEAR REACTIONS 244Pu(48Ca, 3n), E=236 MeV; measured σ, Eα, Iα(t), αα-, (recoil)α-coin following residual nucleus decay; deduced evidence for 289Fl, 285Cn, 281Ds.

RADIOACTIVITY 289Fl, 285Cn, 281Ds(α) [from 244Pu(48Ca, 3n) and subsequent decay]; measured Eα, T1/2; deduced enhanced stability with respect to neutron number.

doi: 10.1103/PhysRevLett.83.3154
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1996LA12      Phys.Rev. C54, 620 (1996)

Yu.A.Lazarev, Yu.V.Lobanov, Yu.Ts.Oganessian, V.K.Utyonkov, F.Sh.Abdullin, A.N.Polyakov, J.Rigol, I.V.Shirokovsky, Yu.S.Tsyganov, S.Iliev, V.G.Subbotin, A.M.Sukhov, G.V.Buklanov, B.N.Gikal, V.B.Kutner, A.N.Mezentsev, K.Subotic, J.F.Wild, R.W.Lougheed, K.J.Moody

α Decay of 273110: Shell closure at N = 162

NUCLEAR REACTIONS 244Pu(34S, X), E=190 MeV; measured Eα, Iα; deduced production σ for 273Ds.

RADIOACTIVITY 273Ds(α) [from 244Pu(34S, X), E=190 MeV]; measured Eα, Iα, T1/2.

doi: 10.1103/PhysRevC.54.620
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1995LA09      Nucl.Phys. A588, 501 (1995)

Yu.A.Lazarev, I.V.Shirokovsky, V.K.Utyonkov, S.P.Tretyakova, V.B.Kutner

Spontaneous Fission of Light Californium Isotopes Produced in 206,207,208Pb + 34,36S Reactions; New nuclide 238Cf

RADIOACTIVITY 237,238,240Cf(SF) [from 206,207,208Pb(34S, X), 206Pb(36S, X), E=215 MeV; 208Pb(40Ar, X), E=225 MeV]; measured T1/2; deduced spontaneous fission branches. 242Cf(SF); measured upper limit for spontaneous fission branch.

NUCLEAR REACTIONS 206,207,208Pb(34S, X), 206Pb(36S, X), E=215 MeV; 208Pb(40Ar, X), E=225 MeV; measured production σ for spontaneously fissioning 237,238,240Cf nuclei. Isotopically enriched targets.

doi: 10.1016/0375-9474(95)00002-I
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1995LA20      Phys.Rev.Lett. 75, 1903 (1995)

Yu.A.Lazarev, Yu.V.Lobanov, Yu.Ts.Oganessian, Yu.S.Tsyganov, V.K.Utyonkov, F.Sh.Abdullin, S.Iliev, A.N.Polyakov, J.Rigol, I.V.Shirokovsky, V.G.Subbotin, A.M.Sukhov, G.V.Buklanov, B.N.Gikal, V.B.Kutner, A.N.Mezentsev, I.M.Sedykh, D.V.Vakatov, R.W.Lougheed, J.F.Wild, K.J.Moody, E.K.Hulet

New Nuclide 267108 Produced by the 238U + 34S Reaction

NUCLEAR REACTIONS, ICPND 238U(34S, X)267Hs, E=186 MeV; measured Eα, Iα; deduced residual production σ.

RADIOACTIVITY 267Hs(α) [from 238U(34S, X), E=186 MeV]; measured Eα, Iα, T1/2.

doi: 10.1103/PhysRevLett.75.1903
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1994LA22      Phys.Rev.Lett. 73, 624 (1994)

Yu.A.Lazarev, Yu.V.Lobanov, Yu.Ts.Oganessian, V.K.Utyonkov, F.Sh.Abdullin, G.V.Buklanov, B.N.Gikal, S.Iliev, A.N.Mezentsev, A.N.Polyakov, I.M.Sedykh, I.V.Shirokovsky, V.G.Subbotin, A.M.Sukhov, Yu.S.Tsyganov, V.E.Zhuchko, R.W.Lougheed, K.J.Moody, J.F.Wild, E.K.Hulet, J.H.McQuaid

Discovery of Enhanced Nuclear Stability Near the Deformed Shells N = 162 and Z = 108

NUCLEAR REACTIONS 248Cm(22Ne, X), E=116, 121 MeV; measured Eα, Iα; deduced evidence for 265Sg, 266Sg.

RADIOACTIVITY 265Sg, 266Sg(α); measured Eα, Iα; deduced T1/2, SF-decay upper limits. 262Rf [from 266Sg(α-decay)]; measured T1/2.

doi: 10.1103/PhysRevLett.73.624
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1994LA25      Nucl.Phys. A580, 113 (1994)

Yu.A.Lazarev, Yu.Ts.Oganessian, Z.Szeglowski, V.K.Utyonkov, Yu.P.Kharitonov, O.Constantinescu, D.Lien, I.V.Shirokovsky, S.P.Tretyakova

Cross Sections of the (HI, αn) Channel in the Cold-Fusion-Type Reactions 209Bi + 40Ar and 208Pb + 37Cl

NUCLEAR REACTIONS 209Bi(40Ar, X), 208Pb(37Cl, X), E=230 MeV; measured production σ for 240Cm; deduced σ upper limits for (40Ar, αn), (37Cl, αn), other reactions. Enriched targets, radiochemistry technique.

RADIOACTIVITY 242Es, 238Bk(EC); measured T1/2, EC-delayed fission yields; deduced delayed fission branching in 238Bk.

doi: 10.1016/0375-9474(94)90818-4
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1994LO27      J.Alloys and Compounds 213/214, 61 (1994)

R.W.Lougheed, K.J.Moody, J.FD.Wild, E.K.Hulet, J.H.McQuaid, Yu.A.Lazarev, Yu.V.Lobanov, Yu.Ts.Oganessian, V.K.Utyonkov, F.Sh.Abdullin, G.V.Buklanov, B.N.Gikal, S.Iliev, A.N.Mezentsev, A.N.Polyakov, I.M.Sedykh, I.V.Shirokovsky, V.G.Subbotin, A.M.Sukhov, Yu.S.Tsyganov, V.E.Zhuchko

Observation of enhanced nuclear stability near the 162 neutron shell

RADIOACTIVITY 265,266Sg(α) [from 248Cm(22Ne, xn)]; measured Eα, T1/2. 262Rf(SF) [from 266Sg decay]; measured T1/2. Comparison with model predictions.

doi: 10.1016/0925-8388(94)90881-8
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1994OG02      Z.Phys. A349, 341 (1994)

Yu.Ts.Oganessian, Yu.A.Lazarev, V.L.Mikheev, Yu.A.Muzychka, I.V.Shirokovsky, S.P.Tretyakova, V.K.Utyonkov

Search for Cluster Decay of 114Ba

NUCLEAR REACTIONS 58Ni(58Ni, 2n), E=280 MeV; measured 12C track range(energy) spectra. 114Ba deduced 12C-decay T1/2 lower limit. Polycarbonate track detectors.

RADIOACTIVITY 114Ba(12C) [from 58Ni(58Ni, 2n), E=280 MeV]; measured 12C track range(energy) spectra; deduced 12C-decay T1/2 lower limit. Polycarbonate track detectors.

doi: 10.1007/BF01288988
Citations: PlumX Metrics


1989IL02      Nuovo Cim. 101A, 225 (1989)

A.S.Iljinov, Yu.Ts.Oganessian, E.A.Cherepanov, A.G.Demin, S.P.Tretyakova, V.K.Utyonkov, I.V.Shirokovsky

An Energy Shift between the Fusion Barrier and Interaction Barrier in Heavy Nuclear Systems

NUCLEAR REACTIONS 192Os(54Cr, 2n), E=290 MeV; 176Yb(70Zn, 2n), E=370 MeV; 170Er(76Ge, 2n), E=400 MeV; 206Pb(50Ti, n), E=270 MeV; 206Pb(54Cr, n), E=290 MeV; 209Bi(51V, n), E=280 MeV; 207Pb(54Cr, n), E=290 MeV; 208Pb(53Cr, n), E=280 MeV; 205Tl, 206Pb(58Fe, n), E=320 MeV; measured residual production σ; deduced fusion, interaction barriers energy shift. Other data analyzed.


1989LA07      Phys.Scr. 39, 422 (1989)

Yu.A.Lazarev, Yu.V.Lobanov, R.N.Sagaidak, V.K.Utyonkov, M.Hussonnois, Yu.P.Kharitonov, I.V.Shirokovsky, S.P.Tretyakova, Yu.Ts.Oganessian

Study of the Stability of the Ground States and K-Isomeric States of 250Fm and 254102 against Spontaneous Fission

RADIOACTIVITY 250,250mFm(α) [from 249Cf(α, 3n), E=34 MeV]; 254,254mNo(α) [from 208Pb(48Ca, 2n)]; measured Eα, Iα; deduced SF(T1/2), branching ratios.

NUCLEAR REACTIONS 206,208Pb(48Ca, xn), E(cm)=169-180 MeV; measured Eα, Iα; deduced 254102 total yield.

doi: 10.1088/0031-8949/39/4/002
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1987LA23      Europhys.Lett. 4, 893 (1987)

Yu.A.Lazarev, Yu.Ts.Oganessian, I.V.Shirokovsky, S.P.Tretyakova, V.K.Utyonkov, G.V.Buklanov

Observation of Delayed Nuclear Fission in the Region of 180Hg

NUCLEAR REACTIONS 144,147,150Sm(40Ca, F), 144Sm(40Ar, F), E=230 MeV; measured delayed fission event time distribution. 180Hg deduced β-delayed fission evidence. Enriched targets.

RADIOACTIVITY 180Hg [from 144Sm(40Ca, X), E=230 MeV]; measured β-delayed fission T1/2.

doi: 10.1209/0295-5075/4/8/006
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1984DE07      Z.Phys. A315, 197 (1984)

A.G.Demin, S.P.Tretyakova, V.K.Utyonkov, I.V.Shirokovsky

On the Properties of the Element 106 Isotopes Produced in the Reactions Pb + 54Cr

RADIOACTIVITY 259Sg, 260Sg, 261Sg(SF) [from Pb(54Cr, xn), E=290 MeV]; measured T1/2.

NUCLEAR REACTIONS 206,207,208Pb(54Cr, n), (54Cr, 2n), E=290 MeV; measured production σ for 259Sg, 260Sg, SF fragment time distribution.

doi: 10.1007/BF01419379
Citations: PlumX Metrics


1984OG02      Z.Phys. A319, 215 (1984)

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

On the Stability of the Nuclei of Element 108 with A = 263-265

NUCLEAR REACTIONS 208Pb(50Ti, xn)257Rf/256Rf/255Rf, E=5.45 MeV/nucleon; 208Pb(54Cr, xn)261Sg/260Sg/259Sg, E=5.5 MeV/nucleon; 208Pb(58Fe, xn)265Hs/264Hs, E=5.5 MeV/nucleon; 207Pb(58Fe, xn)264Hs, E=5.5 MeV/nucleon; 209Bi(55Mn, xn), E=5.5 MeV/nucleon; measured evaporation residue production σ. 263Hs, 265Hs, 264Hs deduced considerable α-decay probability, high stability against SF decay. Activation technique.

doi: 10.1007/BF01415635
Citations: PlumX Metrics


1984OG03      Radiochim.Acta 37, 113 (1984)

Yu.Ts.Oganessian, M.Hussonnois, A.G.Demin, Yu.P.Kharitonov, H.Bruchertseifer, O.Constantinescu, Yu.S.Korotkin, S.P.Tretyakova, V.K.Utyonkov, I.V.Shirokovsky, J.Estevez

Experimental Studies of the Formation and Radioactive Decay of Isotopes with Z = 104-109

NUCLEAR REACTIONS 208Pb(50Ti, γ), (50Ti, n), (50Ti, 2n), (50Ti, 3n), E=5.45 MeV/nucleon; 208Pb(49Ti, n), (49Ti, 2n), (49Ti, nα), (49Ti, 2np), E=5.53 MeV/nucleon; 208Pb(48Ti, n), (48Ti, np), (48Ti, α), E=5.4 MeV/nucleon; measured α-, fission fragment numbers; deduced residuals production σ. 209Bi(50Ti, n), E=5.3 MeV/nucleon; 209Bi(54Cr, n), E=5.4 MeV/nucleon; 208Pb(55Mn, n), (59Co, n), 209Bi(58Fe, n), 208Pb(54Cr, n), (54Cr, 2n), (54Cr, 3n), 208Pb(58Fe, n), (58Fe, 2n), 207Pb(58Fe, n), 209Bi(55Mn, n), E=5.5 MeV/nucleon; 209Bi(55Mn, np), E=5.55 MeV/nucleon; 208Pb(50Ti, n), (50Ti, 2n), (50Ti, 3n), E=5.45 MeV/nucleon; measured Eα, α-, fission fragment numbers, decay T1/2; deduced residuals production σ, yields.

RADIOACTIVITY 257Rf, 256Rf, 255Rf, 258Db, 262Bh, 266Mt, 261,260,259Sg, 263,264,265Hs, 254,256Lr, 252No [from Pb, 209Bi(49,50Ti, xn), (58Fe, xn), (55Mn, xn), E ≈ 5-5.5 MeV/nucleon]; measured decay characteristics. 265Hs, 264Hs, 263Hs, 266Mt, 261Sg, 260Sg, 259Sg deduced α-decay preponderance.


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Note: The following list of authors and aliases matches the search parameter V.K.Utyonkov: , V.K.UTYONKOV