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Search: Author = J.B.Roberto

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2023RO15      Eur.Phys.J. A 59, 304 (2023)

J.B.Roberto, M.Du, J.G.Ezold, S.L.Hogle, J.Moon, K.Myhre, K.P.Rykaczewski

Actinide targets for the synthesis of superheavy nuclei

doi: 10.1140/epja/s10050-023-01144-y
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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 T_1/2 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, E_SF deduced T_1/2 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, E_SF, (ER)α-coin, αα-coin, α(SF)-coin, ER(SF)-coin, T_1/2. ²⁶⁸Db; deduced α/SF branching ratio. ²⁶⁴Lr; deduced new isotope, T_1/2, 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, E_SF; deduced T_1/2. 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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2020HO22      Pure Appl.Chem. 92, 1387 (2020)

S.Hofmann, S.N.Dmitriev, C.Fahlander, J.M.Gates, J.B.Roberto, H.Sakai

On the discovery of new elements (IUPAC/IUPAP Report)

COMPILATION Z=101-118; compiled the discoveries of new elements.

RADIOACTIVITY ²⁹³119, ²⁸⁹Ts, ²⁸⁵Mc, ²⁸¹Nh, ²⁷⁷Rg, ²⁷³Mt, ²⁶⁹Bh, ²⁶¹Lr(α), ²⁹⁵119, ²⁹¹Ts, ²⁸⁷Mc, ²⁸³Nh, ²⁷⁹Rg, ²⁷⁵Mt, ²⁷¹Bh, ²⁶⁷Db(α), ²⁹⁷119, ²⁹³Ts, ²⁸⁹Mc, ²⁸⁵Nh, ²⁸¹Rg, ²⁹⁹119, ²⁹⁵Ts, ²⁹¹Mc, ²⁸⁷Nh, ²⁸³Rg, ²⁷⁹Mt, ²⁹⁴119, ²⁹⁰Ts, ²⁸⁶Mc, ²⁸²Nh, ²⁷⁸Rg, ²⁷⁴Mt, ²⁷⁰Bh, ²⁶⁶Db(α), ²⁹⁶119, ²⁹²Ts, ²⁸⁸Mc, ²⁸⁴Nh, ²⁸⁰Rg, ²⁷⁶Mt, ²⁷²Bh, ²⁶⁸Db(α), ²⁹⁸119, ²⁹⁴Ts, ²⁹⁰Mc, ²⁸⁶Nh, ²⁸²Rg, ²⁷⁸Mt, ²⁷⁴Bh, ²⁷⁰Db(α), ³⁰⁰119, ²⁹⁶Ts, ²⁹²Mc, ²⁸⁸Nh, ²⁸⁴Rg, ²⁸⁰Mt, ²⁷⁶Bh(α), ²⁹⁵120, ²⁹¹Og, ²⁸⁷Lv, ²⁸³Fl, ²⁷⁹Cn, ²⁷⁵Ds, ²⁷¹Hs, ²⁶⁷Sg(α), ²⁹⁷120, ²⁹³Og, ²⁸⁹Lv, ²⁸⁵Fl, ²⁸¹Cn, ²⁷⁷Ds, ²⁷³Hs, ²⁶⁹Sg, ²⁶⁵Rf(α), ²⁹⁹120, ²⁹⁵Og, ²⁹¹Lv, ²⁸⁷Fl, ²⁸³Cn, ²⁷⁹Ds(α), ²⁹⁹120, ²⁹⁵Og, ²⁹¹Lv, ²⁸⁷Fl, ²⁸³Cn, ²⁷⁹Ds(α), ²⁹⁶120, ²⁹²Og, ²⁸⁸Lv, ²⁸⁴Fl(α), ²⁹⁸120, ²⁹⁴Og, ²⁹⁰Lv, ²⁸⁶Fl, ²⁸²Cn(α), ³⁰⁰120, ²⁹⁶Og, ²⁹²Lv, ²⁸⁸Fl, ²⁸⁴Cn(α); compiled expected decay chains of isotopes of elements 119 and 120 which could be produced in reactions with beams of the most neutron rich stable isotopes of elements from calcium to manganese and targets of ²⁴⁴Pu, ²⁴³Am, ²⁴⁸Cm, ²⁴⁹Bk, ²⁴⁹Cf, ²⁵⁰Cf, ²⁵¹Cf, and ²⁵⁴Es.

doi: 10.1515/pac-2020-2926
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2020KH11      Phys.Rev. C 102, 064602 (2020)

J.Khuyagbaatar, A.Yakushev, Ch.E.Dullmann, D.Ackermann, L.-L.Andersson, M.Asai, M.Block, R.A.Boll, H.Brand, D.M.Cox, M.Dasgupta, X.Derkx, A.Di Nitto, K.Eberhardt, J.Even, M.Evers, C.Fahlander, U.Forsberg, J.M.Gates, N.Gharibyan, P.Golubev, K.E.Gregorich, J.H.Hamilton, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.J.Hinde, J.Hoffmann, R.Hollinger, A.Hubner, E.Jager, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, M.Laatiaoui, S.Lahiri, R.Lang, B.Lommel, M.Maiti, K.Miernik, S.Minami, A.K.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, G.K.Pang, P.Papadakis, D.Renisch, J.B.Roberto, D.Rudolph, J.Runke, K.P.Rykaczewski, L.G.Sarmiento, M.Schadel, B.Schausten, A.Semchenkov, D.A.Shaughnessy, P.Steinegger, J.Steiner, E.E.Tereshatov, P.Thorle-Pospiech, K.Tinschert, T.Torres De Heidenreich, N.Trautmann, A.Turler, J.Uusitalo, M.Wegrzecki, N.Wiehl, S.M.Van Cleve, V.Yakusheva

Search for elements 119 and 120

NUCLEAR REACTIONS ²⁴⁹Bk, ²⁴⁹Cf(⁵⁰Ti, X)²⁹⁹119^*/²⁹⁹120^*, E(average)=281.5 MeV; measured evaporation residues (ERs), Eα, correlated ER-α and ER-α₁-α₂-SF events using UNILAC accelerator, TASCA separator, and Focal plane detector system (FPDS) consisting of double-sided silicon strip (DSSD) detectors, and Si-strip detectors for position and time correlations of events. ^295,296119, ^295,296120; deduced no evidence for non-random correlated events related to 3n- or 4n-channel deexcitations of the compound nuclei ²⁹⁹119 and ²⁹⁹120, within a sensitivity limit of one event corresponding to σ=65 fb for ²⁴⁹Bk+⁵⁰Ti reaction and σ=200 fb for ²⁴⁹Cf+⁵⁰Ti; discussed nonobservation of Z=119 and 120 superheavy elements within the context of the fusion-evaporation reaction mechanism.

doi: 10.1103/PhysRevC.102.064602
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD8036.

2020TA02      Phys.Rev.Lett. 124, 052502 (2020)

T.Tanaka, K.Morita, K.Morimoto, D.Kaji, H.Haba, R.A.Boll, N.T.Brewer, S.Van Cleve, D.J.Dean, S.Ishizawa, Y.Ito, Y.Komori, K.Nishio, T.Niwase, B.C.Rasco, J.B.Roberto, K.P.Rykaczewski, H.Sakai, D.W.Stracener, K.Hagino

Study of Quasielastic Barrier Distributions as a Step towards the Synthesis of Superheavy Elements with Hot Fusion Reactions

NUCLEAR REACTIONS ²⁴⁸Cm(²²Ne, X), (²⁶Mg, X), ²³⁸U(⁴⁸Ca, X), E(cm)=165.1, 203.7 MeV; measured reaction products; deduced σ. Comparison with available data.

doi: 10.1103/PhysRevLett.124.052502
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2019KH04      Phys.Rev. C 99, 054306 (2019)

J.Khuyagbaatar, A.Yakushev, Ch.E.Dullmann, D.Ackermann, L.-L.Andersson, M.Asai, M.Block, R.A.Boll, H.Brand, D.M.Cox, M.Dasgupta, X.Derkx, A.Di Nitto, K.Eberhardt, J.Even, M.Evers, C.Fahlander, U.Forsberg, J.M.Gates, N.Gharibyan, P.Golubev, K.E.Gregorich, J.H.Hamilton, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.J.Hinde, J.Hoffmann, R.Hollinger, A.Hubner, E.Jager, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, M.Laatiaoui, S.Lahiri, R.Lang, B.Lommel, M.Maiti, K.Miernik, S.Minami, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, G.K.Pang, P.Papadakis, D.Renisch, J.Roberto, D.Rudolph, J.Runke, K.P.Rykaczewski, L.G.Sarmiento, M.Schadel, B.Schausten, A.Semchenkov, D.A.Shaughnessy, P.Steinegger, J.Steiner, E.E.Tereshatov, P.Thorle-Pospiech, K.Tinschert, T.Torres De Heidenreich, N.Trautmann, A.Turler, J.Uusitalo, D.E.Ward, M.Wegrzecki, N.Wiehl, S.M.Van Cleve, V.Yakusheva

Fusion reaction ⁴⁸Ca + ²⁴⁹Bk leading to formation of the element Ts (Z=117)

NUCLEAR REACTIONS ²⁴⁹Bk(⁴⁸Ca, 3n), (⁴⁸Ca, 4n)²⁹³Ts/²⁹⁴Ts, E=252.1, 254.0, 258.0 MeV; measured reaction products, evaporation residues (ER), Eα, Iα, (ER)α-correlated decay chains, and σ using double-sided silicon strip detectors for α detection, TASCA separator for evaporation residue, and multiwire proportional counter for detection of residues at UNILAC accelerator facility of GSI. Comparison with previous experimental data for (ER)α-correlated decay chains from DGFRS-Dubna facility.

RADIOACTIVITY ²⁹⁴Ts, ²⁹⁰Mc, ²⁸⁶Nh, ²⁸²Rg, ²⁷⁸Mt, ²⁷⁴Bh, ²⁷⁰Db(α); ²⁹³Ts, ²⁸⁹Mc, ²⁸⁵Nh, ²⁸¹Rg(α); ²⁶⁶Lr, ²⁷⁰Db, ²⁷⁷Mt, ²⁷⁷Hs(SF); measured Eα, Iα, SF events, half-lives. ²⁶⁶Lr, ²⁷⁰Db(α), (SF); measured half-lives and α/SF branching ratios. Comparison with previous experimental data for (ER)α-correlated decay chains from DGFRS-Dubna facility. A=200-240; A=240-260; systematics of α-decay half-lives of isotopes produced in ⁴⁸Ca+²⁴⁹Bk and ⁴⁸Ca+²⁴⁹Cf reactions.

doi: 10.1103/PhysRevC.99.054306
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0944. Data from this article have been entered in the XUNDL database. For more information, click here.

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 ^{249,250,251,252}Cf(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 T_1/2. ^294,296Og(α); comparison of experimental values for Q(α) and T_1/2 for ²⁹⁴Og with theoretical predictions for ²⁹⁴Og and ²⁹⁶Og.

doi: 10.1103/PhysRevC.98.024317
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Data from this article have been entered in the XUNDL database. For more information, click here.

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, ^{238,241,243,244,245,246m}Am, 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 E_α, E_SF, T_1/2 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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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetF1336.

2016HO06      Eur.Phys.J. A 52, 116 (2016)

S.Hofmann, S.Heinz, R.Mann, J.Maurer, G.Munzenberg, S.Antalic, W.Barth, L.Dahl, K.Eberhardt, R.Grzywacz, J.H.Hamilton, R.A.Henderson, J.M.Kenneally, B.Kindler, I.Kojouharov, R.Lang, B.Lommel, K.Miernik, D.Miller, K.J.Moody, K.Morita, K.Nishio, A.G.Popeko, J.B.Roberto, J.Runke, K.P.Rykaczewski, C.Scheidenberger, D.A.Shaughnessy, M.A.Stoyer, P.Thorle-Pospiech, K.Tinschert, N.Trautmann, J.Uusitalo, A.V.Yeremin

Remarks on the fission barriers of super-heavy nuclei

RADIOACTIVITY ²⁸⁵Fl, ^291,292,293Lv, ²⁹⁴Og(α); calculated mass excess, Q_α, shell correction energies for complete α-decay chains. Z=118, 120(α); deduced estimates for synthesis σ. Compared with calculations using macroscopic-microscopic models.

doi: 10.1140/epja/i2016-16116-0
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2016HO09      Eur.Phys.J. A 52, 180 (2016)

S.Hofmann, S.Heinz, R.Mann, J.Maurer, G.Munzenberg, S.Antalic, W.Barth, H.G.Burkhard, L.Dahl, K.Eberhardt, R.Grzywacz, J.H.Hamilton, R.A.Henderson, J.M.Kenneally, B.Kindler, I.Kojouharov, R.Lang, B.Lommel, K.Miernik, D.Miller, K.J.Moody, K.Morita, K.Nishio, A.G.Popeko, J.B.Roberto, J.Runke, K.P.Rykaczewski, S.Saro, C.Scheidenberger, H.J.Schott, D.A.Shaughnessy, M.A.Stoyer, P.Thorle-Pospiech, K.Tinschert, N.Trautmann, J.Uusitalo, A.V.Yeremin

Review of even element super-heavy nuclei and search for element

doi: 10.1140/epja/i2016-16180-4
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2015RO25      Nucl.Phys. A944, 99 (2015)

J.B.Roberto, C.W.Alexander, R.A.Boll, J.D.Burns, J.G.Ezold, L.K.Felker, S.L.Hogle, K.P.Rykaczewski

Actinide targets for the synthesis of super-heavy elements

doi: 10.1016/j.nuclphysa.2015.06.009
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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, 240}Pu + 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 E_ER, Eα, E_SF, T_1/2; deduced Q(α). Systematics of SF half-lives and α-decay energies.

doi: 10.1103/PhysRevC.92.034609
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2014KH04      Phys.Rev.Lett. 112, 172501 (2014)

J.Khuyagbaatar, A.Yakushev, C.E.Dullmann, D.Ackermann, L.-L.Andersson, M.Asai, M.Block, R.A.Boll, H.Brand, D.M.Cox, M.Dasgupta, X.Derkx, A.Di Nitto, K.Eberhardt, J.Even, M.Evers, C.Fahlander, U.Forsberg, J.M.Gates, N.Gharibyan, P.Golubev, K.E.Gregorich, J.H.Hamilton, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.J.Hinde, J.Hoffmann, R.Hollinger, A.Hubner, E.Jager, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, M.Laatiaoui, S.Lahiri, R.Lang, B.Lommel, M.Maiti, K.Miernik, S.Minami, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, G.K.Pang, P.Papadakis, D.Renisch, J.Roberto, D.Rudolph, J.Runke, K.P.Rykaczewski, L.G.Sarmiento, M.Schadel, B.Schausten, A.Semchenkov, D.A.Shaughnessy, P.Steinegger, J.Steiner, E.E.Tereshatov, P.Thorle-Pospiech, K.Tinschert, T.Torres De Heidenreich, N.Trautmann, A.Turler, J.Uusitalo, D.E.Ward, M.Wegrzecki, N.Wiehl, S.M.Van Cleve, V.Yakusheva

⁴⁸Ca + ²⁴⁹Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying ²⁷⁰Db and Discovery of ²⁶⁶Lr

NUCLEAR REACTIONS ²⁴⁹Bk(⁴⁸Ca, X)²⁹⁴Ts, E=268.3, 270.2, 274.1 MeV; measured reaction products, Eα, Iα; deduced σ. Comparison with experimental data.

RADIOACTIVITY ²⁹⁴Ts, ²⁹⁰Mc, ²⁸⁶Nh, ²⁸²Rg, ²⁷⁸Mt, ²⁷⁴Bh, ²⁷⁰Db, ²⁶⁶Lr(α); measured decay products, Eα, Iα; deduced T_1/2. Comparison with experimental data.

doi: 10.1103/PhysRevLett.112.172501
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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 T_1/2. ^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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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, 294}117 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, T_1/2. 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, T_1/2, 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, T_1/2.

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, T_1/2.

RADIOACTIVITY ^293,294Ts, ^289,290Mc, ^285,286Nh, ²⁸²Rg, ²⁷⁸Mt, ²⁷⁴Bh(α); measured Eα, Iα, and half-lives. ²⁷⁰Db, ²⁸¹Rg(SF); measured TKE, and T_1/2.

doi: 10.1103/PhysRevLett.104.142502
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Note: The following list of authors and aliases matches the search parameter J.B.Roberto: , J.B.ROBERTO