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NSR database version of April 11, 2024.

Search: Author = C.E.Dullmann

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2024KH02      Phys.Rev. C 109, 034311 (2024)

J.Khuyagbaatar, R.A.Cantemir, Ch.E.Dullmann, E.Jager, B.Kindler, J.Krier, N.Kurz, B.Lommel, B.Schausten, A.Yakushev

Decay properties of the neutron-deficient isotope 242Es

doi: 10.1103/PhysRevC.109.034311
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2023AD02      Eur.Phys.J. A 59, 15 (2023)

A.Adamczak, A.Antognini, N.Berger, T.E.Cocolios, N.Deokar, Ch.E.Dullmann, A.Eggenberger, R.Eichler, M.Heines, H.Hess, P.Indelicato, K.Kirch, A.Knecht, J.J.Krauth, J.Nuber, A.Ouf, A.Papa, R.Pohl, E.Rapisarda, P.Reiter, N.Ritjoho, S.Roccia, M.Seidlitz, N.Severijns, K.von Schoeler, A.Skawran, S.M.Vogiatzi, N.Warr and F.Wauters

Muonic atom spectroscopy with microgram target material

doi: 10.1140/epja/s10050-023-00930-y
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2023AU02      Phys.Rev. C 107, 064604 (2023)

M.Au, M.Athanasakis-Kaklamanakis, L.Nies, R.Heinke, K.Chrysalidis, U.Koster, P.Kunz, B.Marsh, M.Mougeot, L.Schweikhard, S.Stegemann, Y.Vila Gracia, Ch.E.Dullmann, S.Rothe

Production of neptunium and plutonium nuclides from uranium carbide using 1.4-GeV protons

NUCLEAR REACTIONS U(p, X)235Np/236Np/237Np/238Np/239Np/240Np/241Np/235Pu/236Pu/237Pu/238Pu/239Pu/240Pu/241Pu, E=1.4 GeV; measured reaction products using resonance ionization laser ion source (RILIS), general purpose separator (GPS), and ISOLTRAP multireflection time-of-flight mass spectrometer (MR-ToF MS) at CERN-ISOLDE facility. 234,237,236,239,240U, 231,232,233,234,235,236,237,238,239,240,241Np, 235,236,237,238,239,240,241Pu; calculated production yields by inelastic reactions and through decays of precursors: 234,236,237Pa, 231,233,235Pu, 237,239,240U, 235Am, 235,236,238,239,240,241Np using GEANT4 QGSP_INCLXX+ABLA code. Comparison with predictions of GEANT4 and FLUKA simulations; discussed limit of accelerator-based isotope production at high-energy proton accelerator facilities for nuclides in the actinide region.

ATOMIC PHYSICS 236,237,239Np, 236,239,240Pu; measured isotope shifts for the 395.6-nm ground-state transition in Np isotopes, and for the 413.4-nm ground-state transition in Pu isotopes by two-step ionization schemes using intra-cavity doubled Ti:Sa lasers to resonantly ionize Np and Pu isotopes.

doi: 10.1103/PhysRevC.107.064604
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2023CO04      Phys.Rev. C 107, L021301 (2023)

D.M.Cox, A.Saamark-Roth, D.Rudolph, L.G.Sarmiento, R.M.Clark, J.L.Egido, P.Golubev, J.Heery, A.Yakushev, S.AAberg, H.M.Albers, M.Albertsson, M.Block, H.Brand, T.Calverley, R.Cantemir, B.G.Carlsson, Ch.E.Dullmann, J.Eberth, C.Fahlander, U.Forsberg, J.M.Gates, F.Giacoppo, M.Gotz, S.Gotz, R.-D.Herzberg, Y.Hrabar, E.Jager, D.Judson, J.Khuyagbaatar, B.Kindler, I.Kojouharov, J.V.Kratz, J.Krier, N.Kurz, L.Lens, J.Ljungberg, B.Lommel, J.Louko, C.-C.Meyer, A.Mistry, C.Mokry, P.Papadakis, E.Parr, J.L.Pore, I.Ragnarsson, J.Runke, M.Schadel, H.Schaffner, B.Schausten, D.A.Shaughnessy, P.Thorle-Pospiech, N.Trautmann, J.Uusitalo

Spectroscopy along flerovium decay chains. II. Fine structure in odd-A 289Fl

RADIOACTIVITY 289Fl(α) [from 244Pu(48Ca, X), E=6.02 MeV/nucleon]; 285Cn(α) [from 289Fl(α)]; 281Ds(α) [from 285Cn(α)]; 277Hs(SF) [from 281Ds(α)]; measured decay products, Eα, Iα, Eβ, Iβ αβ-coin, αα-coin, (fragment)αα-coin; deduced Q-values, T1/2, branching ratios, hindrance factor. 289Fl, 285Cn, 281Ds; deduced J, π and δ assignments based on the derived decay path. Comparison with structure calculations based on the symmetry-conserving configuration mixing theory. Gas-filled recoil separator TASCA was used to transmit, select, and focus the flerovium ions into an upgraded version of the TASISpec decay station consisting of implantation DSSD, veto DSSD and set of HPGe detectors (GSI).

doi: 10.1103/PhysRevC.107.L021301
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2023JE01      Phys.Lett. B 837, 137641 (2023)

D.Y.Jeung, D.J.Hinde, M.Dasgupta, C.Simenel, E.C.Simpson, K.J.Cook, H.M.Albers, J.Buete, I.P.Carter, Ch.E.Dullmann, J.Khuyagbaatar, B.Kindler, N.Lobanov, B.Lommel, C.Mokry, E.Prasad, J.Runke, C.Sengupta, J.F.Smith, P.Thorle-Pospiech, N.Trautmann, K.Vo-Phuoc, J.Walshe, E.Williams, A.Yakushev

Sequential fission and the influence of 208Pb closed shells on the dynamics of superheavy element synthesis reactions

NUCLEAR REACTIONS 238U, 244Pu, 248Cm, 249Cf(50Ti, F), E ∼ 230 MeV; measured fission fragments. 208Pb; deduced σ, binary quasifission mass spectra, sequential fission survival probabilities. The ANU Heavy Ion Accelerator Facility.

doi: 10.1016/j.physletb.2022.137641
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2023LO03      Eur.Phys.J. A 59, 14 (2023)

B.Lommel, C.E.Dullmann, B.Kindler, D.Renisch

Status and developments of target production for research on heavy and superheavy nuclei and elements

doi: 10.1140/epja/s10050-023-00919-7
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2023SA03      Phys.Rev. C 107, 024301 (2023)

A.Saamark-Roth, D.M.Cox, D.Rudolph, L.G.Sarmiento, M.Albertsson, B.G.Carlsson, J.L.Egido, P.Golubev, J.Heery, A.Yakushev, S.AAberg, H.M.Albers, M.Block, H.Brand, T.Calverley, R.Cantemir, R.M.Clark, Ch.E.Dullmann, J.Eberth, C.Fahlander, U.Forsberg, J.M.Gates, F.Giacoppo, M.Gotz, S.Gotz, R.-D.Herzberg, Y.Hrabar, E.Jager, D.Judson, J.Khuyagbaatar, B.Kindler, I.Kojouharov, J.V.Kratz, J.Krier, N.Kurz, L.Lens, J.Ljungberg, B.Lommel, J.Louko, C.-C.Meyer, A.Mistry, C.Mokry, P.Papadakis, E.Parr, J.L.Pore, I.Ragnarsson, J.Runke, M.Schadel, H.Schaffner, B.Schausten, D.A.Shaughnessy, P.Thorle-Pospiech, N.Trautmann, J.Uusitalo

Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, 282Cn, and spontaneous fission branches

RADIOACTIVITY 290,288,286,284Fl(α)(SF) [from 244Pu(48Ca, X), E=6.02 MeV/nucleon]; 282Cn(α)(SF) [286Fl(α)]; 284Cn(α)(SF) [from 288Fl(α)]; 286Cn(α)(SF) [290Fl(α)]; 282Ds(α)(SF) [from 286Cn(α)]; 280Ds(α)(SF) [from 284Cn(α)]; measured decay products, Eα, Iα, Eβ, Iβ αβ-coin, αα-coin, (fragment)αα-coin; deduced Q-values, T1/2, branching ratios, hindrance factor. 282Cn; deduced levels, J, π, T1/2 of excited states, transition rates, monopole transition strengths. Comparison to macroscopic-microscopic finite-range liquid-drop model, self-consistent Hartree-Fock-Bogoliubov calculations and other experimental data. Gas-filled recoil separator TASCA was used to transmit, select, and focus the flerovium ions into an upgraded version of the TASISpec decay station consisting of implantation DSSD, veto DSSD and set of HPGe detectors (GSI).

doi: 10.1103/PhysRevC.107.024301
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2023WE04      Phys.Rev. C 107, 034313 (2023)

F.Weber, T.E.Albrecht-Schonzart, S.O.Allehabi, S.Berndt, M.Block, H.Dorrer, C.E.Dullmann, V.A.Dzuba, J.G.Ezold, V.V.Flambaum, V.Gadelshin, S.Goriely, A.Harvey, R.Heinke, S.Hilaire, M.Kaja, T.Kieck, N.Kneip, U.Koster, J.Lantis, C.Mokry, D.Munzberg, S.Nothhelfer, S.Oberstedt, S.Peru, S.Raeder, J.Runke, V.Sonnenschein, M.Stemmler, D.Studer, P.Thorle-Pospiech, H.Tomita, N.Trautmann, S.Van Cleve, J.Warbinek, K.Wendt

Nuclear moments and isotope shifts of the actinide isotopes 249-253Cf probed by laser spectroscopy

NUCLEAR MOMENTS 249,250,251,252,253Cf; measured hyperfine spectra; deduced energy positions of three atomic ground-state transitions, isotope shifts. 249,251,253Cf; deduced nuclear magnetic dipole moments, hyperfine parameters. 249,253Cf; deduced spectroscopic quadrupole moments. Comparison with previous experimental data. Laser resonance ionisation high-resolution spectroscopy. Comparison to theoretical estimations. RISIKO mass separator at Johannes Gutenberg University Mainz.

doi: 10.1103/PhysRevC.107.034313
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2022BA22      Eur.Phys.J. A 58, 94 (2022)

J.Ballof, K.Chrysalidis, Ch.E.Dullmann, V.Fedosseev, E.Granados, D.Leimbach, B.A.Marsh, J.P.Ramos, A.Ringvall-Moberg, S.Rothe, T.Stora, S.G.Wilkins, A.Yakushev

A concept for the extraction of the most refractory elements at CERN-ISOLDE as carbonyl complex ions

doi: 10.1140/epja/s10050-022-00739-1
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2022KA45      Phys.Rev. C 106, 054325 (2022)

O.Kaleja, B.Andjelic, O.Bezrodnova, K.Blaum, M.Block, S.Chenmarev, P.Chhetri, C.Droese, Ch.E.Dullmann, M.Eibach, S.Eliseev, J.Even, P.Filianin, F.Giacoppo, S.Gotz, Yu.Gusev, M.J.Gutierrez, F.P.Hessberger, N.Kalantar-Nayestanaki, J.J.W.van de Laar, M.Laatiaoui, S.Lohse, N.Martynova, E.Minaya Ramirez, A.K.Mistry, T.Murbock, Yu.Novikov, S.Raeder, D.Rodriguez, F.Schneider, L.Schweikhard, P.G.Thirolf, A.Yakushev

Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP

ATOMIC MASSES 251,254No, 254,255,256Lr, 257Rf; measured cyclotron frequency; deduced mass excesses, two-neutron shell gap. Comparison to AME2020. Phase-imaging ion-cyclotron resonance mass spectrometry (PI-ICR MS) at SHIPTRAP setup. Isotopes produced in following reactions 206Pb(48Ca, 3n)251No, E=4.8 MeV/nucleon, 208Pb(48Ca, 2n)254No, E=4.56 MeV/nucleon, 209Bi(48Ca, 3n)254Lr, E=4.81 MeV/nucleon, 209Bi(48Ca, 2n)255Lr, E=4.56 MeV/nucleon, 209Bi(48Ca, n)256Lr, E=4.5 MeV/nucleon, 208Pb(50Ti, n)257Rf, E=4.65 MeV/nucleon at GSI Darmstadt.

RADIOACTIVITY 258Db, 254Lr(α); deduced Q values. Comparison to other experimental data.

doi: 10.1103/PhysRevC.106.054325
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2022KH08      Phys.Rev. C 106, 024309 (2022)

J.Khuyagbaatar, H.Brand, Ch.E.Dullmann, F.P.Hessberger, E.Jager, B.Kindler, J.Krier, N.Kurz, B.Lommel, Yu.Nechiporenko, Yu.N.Novikov, B.Schausten, A.Yakushev

Search for fission from a long-lived isomer in 250No and evidence of a second isomer

RADIOACTIVITY 250,250mNo(α), (SF)[from 204Pb(48Ca, 2n), E=218.9 MeV, followed by separation of fragments using TASCA system at GSI facility]; measured evaporation residues (ERs), (ER)α- and (ER)(fission events)-correlations, T1/2 of g.s. and two isomers using double-sided silicon strips detectors, and a multiwire proportional counter (MWPC). 250,250mNo; deduced T1/2, upper limit of fission (SF) branching of 23-μs isomer, new shorter-lived high-K isomer. Discussed nonobservation of fission branching of the long-lived isomer, and fission-hindrance factor due to K-quantum number with theoretical predictions from various semiempirical approaches.

doi: 10.1103/PhysRevC.106.024309
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD8050. Data from this article have been entered in the XUNDL database. For more information, click here.


2022NO01      Phys.Rev. C 105, L021302 (2022)

S.Nothhelfer, Th.E.Albrecht-Schonzart, M.Block, P.Chhetri, Ch.E.Dullmann, J.G.Ezold, V.Gadelshin, A.Gaiser, F.Giacoppo, R.Heinke, T.Kieck, N.Kneip, M.Laatiaoui, Ch.Mokry, S.Raeder, J.Runke, F.Schneider, J.M.Sperling, D.Studer, P.Thorle-Pospiech, N.Trautmann, F.Weber, K.Wendt

Nuclear structure investigations of 253-255Es by laser spectroscopy

NUCLEAR MOMENTS 253,254,255Es; measured hyperfine spectra; deduced J, isotope shifts, hyperfine constants, nuclear spins, magnetic dipole moments, electric quadrupole moments. Comparison with previous experimental data. Laser resonance ionization spectroscopy. RISIKO mass separator at Johannes Gutenberg University Mainz.

doi: 10.1103/PhysRevC.105.L021302
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2021BA41      Phys.Lett. B 820, 136601 (2021)

K.Banerjee, D.J.Hinde, M.Dasgupta, J.Sadhukhan, E.C.Simpson, D.Y.Jeung, C.Simenel, B.M.A.Swinton-Bland, E.Williams, L.T.Bezzina, I.P.Carter, K.J.Cook, H.M.Albers, Ch.E.Dullmann, J.Khuyagbaatar, B.Kindler, B.Lommel, C.Mokry, E.Prasad, J.Runke, N.Schunck, C.Sengupta, J.F.Smith, P.Thorle-Pospiech, N.Trautmann, K.Vo-Phuoc, J.Walshe, A.Yakushev

Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

NUCLEAR REACTIONS 208Pb, 244Pu(48Ca, X), 232Th(54Cr, X)Fl, E not given; analyzed available data; deduced masses, σ(θ). Comparison with microscopic calculations of Helmholtz free energy surfaces (FES).

doi: 10.1016/j.physletb.2021.136601
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2021HE15      Phys.Rev.Lett. 126, 182501 (2021)

F.P.Hessberger, M.Block, C.E.Dullmann, A.Yakushev, M.Leino, J.Uusitalo

Some Remarks on the Discovery of 244

RADIOACTIVITY 244Md(α) [from 209Bi(40Ar, 5n)244Md, E not given]; analyzed available data, Eα, Iα. 245,246Md, 245Fm; deduced that results should be attributed to 245Md with small contributions (one event each) from 245Fm and probably 246Md.

doi: 10.1103/PhysRevLett.126.182501
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2021KH03      Phys.Rev. C 103, 064303 (2021)

J.Khuyagbaatar, H.Brand, R.A.Cantemir, Ch.E.Dullmann, M.Gotz, S.Gotz, F.P.Hessberger, E.Jager, B.Kindler, J.Krier, N.Kurz, B.Lommel, B.Schausten, A.Yakushev

Isomeric states in 256Rf

RADIOACTIVITY 256mRf(IT)[from 207,208Pb(50Ti, xn), E=237.5, 242.5 MeV at the Trans-Actinide Separator and Chemistry Apparatus (TASCA) at GSI and implanted in double-sided silicon strip detector (DSSD)]; measured evaporation residues (ER) and fission (ER-FI) and ER-conversion electrons-fission (ER-CE-FI) correlated events, half-lives of the two isomers from correlated decay curves by a triggerless method. 256Rf; deduced two isomeric activities a low-spin and a high-spin, population rates, two-quasiparticle configurations with K-quantum number assignments, third isomer in 256Rf in earlier literature not observed perhaps due to low statistics.

doi: 10.1103/PhysRevC.103.064303
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD8037. Data from this article have been entered in the XUNDL database. For more information, click here.


2021KH07      Phys.Rev. C 104, L031303 (2021)

J.Khuyagbaatar, H.Brand, R.A.Cantemir, Ch.E.Dullmann, F.P.Hessberger, E.Jager, B.Kindler, J.Krier, N.Kurz, B.Lommel, B.Schausten, A.Yakushev

Spontaneous fission instability of the neutron-deficient No and Rf isotopes: The new isotope 249No

RADIOACTIVITY 253,253mRf(SF); 253Rf, 249No(α)[253Rf from 204Pb(50Ti, n), E=234.3 MeV]; measured evaporation residues (ERs), (ER)(fission)- and (ER)α-correlated events, Eα, Iα, partial half-lives of two fission activities of 253Rf, α-decay half-life of newly discovered 249No isotope from the α decay mode of 253Rf in (ER)-α-α-α correlated events using gas-filled TransActinide Separator and Chemistry Apparatus (TASCA) at UNILAC, GSI. 253Rf; deduced another high-lying ≈0.6-μs isomer. 251mNo; discussed in Supplemental Material of the paper a possible identification method for direct fission from an isomeric state in 251No. Presence of two fission activities in 253Rf proposed as benchmark cases for the theoretical description of the influence of single-particle orbitals on the fission process.

doi: 10.1103/PhysRevC.104.L031303
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD8039. Data from this article have been entered in the XUNDL database. For more information, click here.


2021SA01      Phys.Rev.Lett. 126, 032503 (2021)

A.Samark-Roth, D.M.Cox, D.Rudolph, L.G.Sarmiento, B.G.Carlsson, J.L.Egido, P.Golubev, J.Heery, A.Yakushev, S.Aberg, H.M.Albers, M.Albertsson, M.Block, H.Brand, T.Calverley, R.Cantemir, R.M.Clark, C.E.Dullmann, J.Eberth, C.Fahlander, U.Forsberg, J.M.Gates, F.Giacoppo, M.Gotz, S.Gotz, R.-D.Herzberg, Y.Hrabar, E.Jager, D.Judson, J.Khuyagbaatar, B.Kindler, I.Kojouharov, J.V.Kratz, J.Krier, N.Kurz, L.Lens, J.Ljungberg, B.Lommel, J.Louko, C.-C.Meyer, A.Mistry, C.Mokry, P.Papadakis, E.Parr, J.L.Pore, I.Ragnarsson, J.Runke, M.Schadel, H.Schaffner, B.Schausten, D.A.Shaughnessy, P.Thorle-Pospiech, N.Trautmann, J.Uusitalo

Spectroscopy along Flerovium Decay Chains: Discovery of 280Ds and an Excited State in 282Cn

RADIOACTIVITY 286,288Fl, 284Cn(α), 282Cn, 280Ds(SF) [from 242,244Pu(48Ca, X)286Fl/288Fl, E=6.021 MeV/nucleon]; measured decay products, Eα, Iα, Eβ, Iβ α-β coin.; deduced Q-values, T1/2, J, π. Comparison with theoretical calculations. The gas-filled separator TASCA at the GSI.

doi: 10.1103/PhysRevLett.126.032503
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2020BA41      Phys.Rev. C 102, 024603 (2020)

T.Banerjee, D.J.Hinde, D.Y.Jeung, K.Banerjee, M.Dasgupta, A.C.Berriman, L.T.Bezzina, H.M.Albers, Ch.E.Dullmann, J.Khuyagbaatar, B.Kindler, B.Lommel, E.C.Simpson, C.Sengupta, B.M.A.Swinton-Bland, T.Tanaka, A.Yakushev, K.Eberhardt, C.Mokry, J.Runke, P.Thorle-Pospiech, N.Trautmann

Systematic evidence for quasifission in 9Be-, 12C-, and 16O-induced reactions forming 258, 260No

NUCLEAR REACTIONS 238U(9Be, F)247Cm*, E=45-60 MeV; 244U(9Be, F)253Cf*, E=45-60 MeV; 248Cm(9Be, F)257Fm*, E=45-60 MeV; 249Cf(9Be, F)258No*, E=45-60 MeV; 248Cm(12C, F)260No*, E=60.80-89.18 MeV; 244Pu(16O, F)260No*, E=84.90-116.27 MeV; measured fission fragments, fission fragment mass and angular distributions using the CUBE spectrometer consisting of three multiwire proportional counters (MWPCs) at the Heavy Ion Accelerator Facility (HIAF) of the Australian National University; deduced reconstructed fission source velocity distributions, full momentum transfer (FMT) fission differential σ(θ, E), total and FMT fission σ(E), FMT mass-angle distributions (MADs), FMT fission angular anisotropies; analyzed mass-ratio (MR) spectra. 254,256,258,260,262No; deduced spontaneous fission mass-ratio distributions. Comparison with predictions from the transition state model (TSM) calculations for fusion fission reactions.

doi: 10.1103/PhysRevC.102.024603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0983.


2020KA46      Eur.Phys.J. A 56, 207 (2020)

F.Kandzia, G.Belier, C.Michelagnoli, J.Aupiais, M.Barani, J.Dudouet, Ch.E.Dullmann, L.W.Iskra, M.Jentschel, Y.H.Kim, U.Koster, A.Turturica

Development of a liquid scintillator based active fission target for FIPPS

NUCLEAR REACTIONS 233,235U(n, F)134Te, E not given; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π.

doi: 10.1140/epja/s10050-020-00201-0
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2020KH01      Nucl.Phys. A994, 121662 (2020)

J.Khuyagbaatar, A.K.Mistry, D.Ackermann, L.-L.Andersson, M.Block, H.Brand, Ch.E.Dullmann, J.Even, F.P.Hessberger, J.Hoffmann, A.Hubner, E.Jager, B.Kindler, J.Krier, N.Kurz, B.Lommel, B.Schausten, J.Steiner, A.Yakushev, V.Yakusheva

The identification and confirmation of isomeric states in 254Rf and 255Rf through conversion electron detection

NUCLEAR REACTIONS 206Pb(50Ti, 2n), (50Ti, n)254,255Rf, E=252.5, 236.0 MeV pulsed beam from the UNILAC-GSI facility; measured evaporation residues (ERs), decay products, conversion electrons, isomers, T1/2 from (ERs)(fission events)-correlated, and (ERs)(fission events)(electron)-correlated decay curves using the gas-filled separator TASCA with multi-wire proportional counter (MWPC) and double-sided silicon strip detectors(DSSDs). 254,255Rf; deduced T1/2 of the ground states and isomers, production σ. Comparison of measured σ with theoretical calculations using statistical fusion-evaporation code HIVAP.

doi: 10.1016/j.nuclphysa.2019.121662
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD8007. Data from this article have been entered in the XUNDL database. For more information, click here.


2020KH08      Phys.Rev.Lett. 125, 142504 (2020)

J.Khuyagbaatar, H.M.Albers, M.Block, H.Brand, R.A.Cantemir, A.Di Nitto, C.E.Dullmann, M.Gotz, S.Gotz, F.P.Hessberger, E.Jager, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, B.Lommel, L.Lens, A.Mistry, B.Schausten, J.Uusitalo, and A.Yakushev

Search for Electron-Capture Delayed Fission in the New Isotope 244Md

RADIOACTIVITY 244,245Md(α), (EC) [from 197Au(50Ti, X), E=239.8, 231.5 MeV]; measured decay products, Eα, Iα; deduced α-particles energies, T1/2. Comparison with available data.

doi: 10.1103/PhysRevLett.125.142504
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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-α12-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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2020SI22      Phys.Rev.Lett. 125, 142503 (2020)

T.Sikorsky, J.Geist, D.Hengstler, S.Kempf, L.Gastaldo, C.Enss, C.Mokry, J.Runke, C.E.Dullmann, P.Wobrauschek, K.Beeks, V.Rosecker, J.H.Sterba, G.Kazakov, T.Schumm, A.Fleischmann

Measurement of the 229Th Isomer Energy with a Magnetic Microcalorimeter

RADIOACTIVITY 233U(α), 229Th(IT); measured decay products, Eγ, Iγ; deduced partial nuclear level scheme, isomer energies and uncertainties, branching ratios of the relevant excited states. Comparison with available data.

doi: 10.1103/PhysRevLett.125.142503
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2019BA23      Eur.Phys.J. A 55, 65 (2019)

J.Ballof, C.Seiffert, B.Crepieux, Ch.E.Dullmann, M.Delonca, M.Gai, A.Gottberg, T.Kroll, R.Lica, M.Madurga Flores, Y.Martinez Palenzuela, T.M.Mendonca, M.Owen, J.P.Ramos, S.Rothe, T.Stora, O.Tengblad, F.Wienholtz

Radioactive boron beams produced by isotope online mass separation at CERN-ISOLDE

ATOMIC PHYSICS 8B(n, α), (p, α), E not given[target in the 8BF2 form]; measured Eα, Iα; deduced α-particle energy spectrum from (n, α) reaction, released activity vs time after irradiation in (p.α); compared with data of Roger et al.

doi: 10.1140/epja/i2019-12719-1
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2019BA26      Phys.Rev.Lett. 122, 232503 (2019)

K.Banerjee, D.J.Hinde, M.Dasgupta, E.C.Simpson, D.Y.Jeung, C.Simenel, B.M.A.Swinton-Bland, E.Williams, I.P.Carter, K.J.Cook, H.M.David, C.E.Dullmann, J.Khuyagbaatar, B.Kindler, B.Lommel, E.Prasad, C.Sengupta, J.F.Smith, K.Vo-Phuoc, J.Walshe, A.Yakushev

Mechanisms Suppressing Superheavy Element Yields in Cold Fusion Reactions

NUCLEAR REACTIONS 208Pb(50Ti, X), (48Ca, X), (54Cr, X), E not given; analyzed available data; deduced projectile impact on drastic fall in the symmetric fission yield, which is reflected in the measured mass-angle distribution by the presence of competing fast nonequilibrium deep inelastic and quasifission processes.

doi: 10.1103/PhysRevLett.122.232503
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2019CH46      Eur.Phys.J. A 55, 173 (2019)

K.Chrysalidis, J.Ballof, Ch.E.Dullmann, V.N.Fedosseev, C.Granados, B.A.Marsh, Y.Martinez Palenzuela, J.P.Ramos, S.Rothe, T.Stora, K.Wendt

Developments towards the delivery of selenium ion beams at ISOLDE

doi: 10.1140/epja/i2019-12873-4
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2019GU06      Nucl.Instrum.Methods Phys.Res. A925, 87 (2019)

C.Guerrero, J.Lerendegui-Marco, K.Eberhardt, Ch.E.Dullmann, A.Junghans, B.Lommel, C.Mokry, J.M.Quesada, J.Runke, P.Thorle-Pospiech, for the n_TOF Collaboration

On the use of stacks of fission-like targets for neutron capture experiments

doi: 10.1016/j.nima.2019.01.063
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2019HE12      Phys.Rev. C 99, 065810 (2019)

T.Heftrich, M.Weigand, Ch.E.Dullmann, K.Eberhardt, S.Fiebiger, J.Glorius, K.Gobel, C.Guerrero, R.Haas, S.Heinitz, J.Lerendegui-Marco, F.Kappeler, J.D.Kaiser, U.Koster, C.Langer, S.Lohse, F.Ludwig, R.Reifarth, D.Renisch, K.Scheutwinkel, D.Schumann, N.Wiehl, C.Wolf

Thermal (n, γ) cross section and resonance integral of 171Tm

NUCLEAR REACTIONS 171Tm(n, γ), E=thermal; measured Eγ, Iγ, thermal and epithermal neutron fluence, σ, and resonance integral using activation technique at Triga reactor facility in Mainz. Comparison with previous experimental values, and with data in evaluated libraries. Relevance to s process in thermally pulsing asymptotic giant branch (TP-AGB) stars.

doi: 10.1103/PhysRevC.99.065810
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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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2019KO05      Phys.Rev. C 99, 024604 (2019)

T.Kogler, A.R.Junghans, R.Beyer, M.Dietz, Ch.E.Dullmann, K.Eberhardt, Ch.Lorenz, S.E.Muller, R.Nolte, T.P.Reinhardt, K.Schmidt, J.Runke, R.Schwengner, M.Takacs, A.Vascon, A.Wagner

Fast-neutron-induced fission cross section of 242Pu measured at the neutron time-of-flight facility ELBE

NUCLEAR REACTIONS 242Pu(n, F), E=0.5-10 MeV; measured fission fragments, neutron time of flight, σ(E) relative to 235U(n, F), σ(E) using parallel plate fission ionization chamber at nELBE facility at Helmholtz-Zentrum Dresden-Rossendorf (HZDR); deduced energy to time-of-flight-correlation, correction factor for neutron scattering, ratio of neutron-induced and SF rate with and without correction for neutron scattering. GEANT4, MCNP6, and FLUKA2011 for neutron transport simulations. Comparison with previous measurements in EXFOR database, evaluated data in ENDF/B-VIII.0 and JEFF-3.3, and theoretical calculations using TALYS-1.8 and EMPIRE-3.2.

RADIOACTIVITY 242Pu(SF); analyzed data on partial half-life for SF decay; deduced T1/2. Comparison with previous experimental values, and evaluated data.

doi: 10.1103/PhysRevC.99.024604
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2019LE09      Eur.Phys.J. A 55, 63 (2019)

J.Lerendegui-Marco, C.Guerrero, T.Belgya, B.Maroti, K.Eberhardt, Ch.E.Dullmann, A.R.Junghans, C.Mokry, J.M.Quesada, J.Runke, P.Thorle-Pospiech

Improved 242Pu(n, γ) thermal cross section combining activation and prompt gamma analysis

NUCLEAR REACTIONS 242Pu(n, γ), E=thermal, keV; measured prompt Eγ, Iγ using BGO guarded coaxial n-type HPGe, digitized by PC-driven Multi Channel Analyser (MCA), activation Eγ, Iγ using DOME, low background chamber with HPGe inside. 197Au(n, γ), E not given; measured activation Eγ, Iγ using DOME, start and stop time after irradiation; deduced absolute intensities of 243Pu and 198Au decay lines, T1/2; compared with its evaluated value.

doi: 10.1140/epja/i2019-12730-6
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2019MI08      Nucl.Phys. A987, 337 (2019)

A.K.Mistry, J.Khuyagbaatar, F.P.Hessberger, D.Ackermann, B.Andel, S.Antalic, M.Block, P.Chhetri, F.Dechery, C.Droese, Ch.E.Dullmann, F.Giacoppo, J.Hoffmann, O.Kaleja, N.Kurz, M.Laatiaoui, L.Lens, J.Maurer, P.Mosat, J.Piot, S.Raeder, M.Vostinar, A.Yakushev, Z.Zhang

The 48Ca+181Ta reaction: Cross section studies and investigation of neutron-deficient 86 ≤ Z ≤ 93 isotopes

NUCLEAR REACTIONS 181Ta(48Ca, x)229Np, E(cm)=212, 217, 226 MeV[energies based on σ predictions by the HIVAP code]; measured xn, αxn, pxn leading to 225Np, 225U, 224Np, Evaporation Residues (ER) separated from 48Ca primary beam using the SHIP velocity filter at GSI, ToF and COMPAct Spectroscopy Set-up (COMPASS) comprising of DSSDs and SSSDs; deduced 225U, 225,226,229Np decay chains; 213Rn, 213,214,215Fr, 217,218,219Ac, 221Th, 221,222,223Pa, 225U, 225,226Np; deduced decay data, T1/2; compared with literature values; compiled production σ maxima in 3n and 4n evaporation channels from compound nuclei with Z=83-94 and projectiles 40Ar, 40,44,48Ca, 50Ti using published experimental data.

doi: 10.1016/j.nuclphysa.2019.05.003
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2019SE13      Nature(London) 573, 243 (2019)

B.Seiferle, L.von der Wense, P.V.Bilous, I.Amersdorffer, C.Lemell, F.Libisch, S.Stellmer, T.Schumm, C.E.Dullmann, A.Palffy, P.G.Thirolf

Energy of the 229Th nuclear clock transition

RADIOACTIVITY 229Th(IT); measured decay products, Eγ, Iγ; deduced transition energy of this isomeric state to the ground state with an uncertainty of 0.17 electronvolts (one standard deviation) using spectroscopy of the internal conversion electrons emitted in flight during the decay of neutral 229mTh atoms.

doi: 10.1038/s41586-019-1533-4
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2019VE09      Eur.Phys.J. C 79, 1026 (2019)

C.Velte, F.Ahrens, A.Barth, K.Blaum, M.Brass, M.Door, H.Dorrer, Ch.E.Dullmann, S.Eliseev, C.Enss, P.Filianin, A.Fleischmann, L.Gastaldo, A.Goeggelmann, T.Day Goodacre, M.W.Haverkort, D.Hengstler, J.Jochum, K.Johnston, M.Keller, S.Kempf, T.Kieck, C.M.Konig, U.Koster, K.Kromer, F.Mantegazzini, B.Marsh, Yu.N.Novikov, F.Piquemal, C.Riccio, D.Richter, A.Rischka, S.Rothe, R.X.Schussler, Ch.Schweiger, T.Stora, M.Wegner, K.Wendt, M.Zampaolo, K.Zuber

High-resolution and low-background 163Ho spectrum: interpretation of the resonance tails

RADIOACTIVITY 163Ho(EC) [from 162Er(n, γ), E thermal]; measured decay products, Eβ, Iβ; deduced energy spectrum, Q-value. Comparison with available data.

doi: 10.1140/epjc/s10052-019-7513-x
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2019VO11      Hyperfine Interactions 240, 23 (2019)

L.C.von der Wense, B.Seiferle, C.Schneider, J.Jeet, I.Amersdorffer, N.Arlt, F.Zacherl, R.Haas, D.Renisch, P.Mosel, P.Mosel, M.Kovacev, U.Morgner, C.E.Dullmann, E.R.Hudson, P.G.Thirolf

The concept of laser-based conversion electron Mossbauer spectroscopy for a precise energy determination of 229mTh

RADIOACTIVITY 229Th(IT) [from 229Th(γ, γ), E not given]; analyzed available data; deduced sensitivity.

doi: 10.1007/s10751-019-1564-0
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2018AC08      Nucl.Instrum.Methods Phys.Res. A907, 81 (2018)

D.Ackermann, A.K.Mistry, F.P.Hessberger, B.Andel, S.Antalic, M.Block, L.Caceres, P.Chhetri, F.Dechery, Ch.Droese, Ch.E.Dullmann, F.Giacoppo, J.Hoffmann, O.Kaleja, O.Kamalou, N.Kurz, J.Khuyagbaatar, R.R.Mandl, T.Murbock, M.Laatiaoui, J.Maurer, P.Mosat, J.Piot, S.Raeder, H.Savajols, O.Sorlin, Ch.Stodel, J.C.Thomas, M.Vostinar, P.Wieczorek, A.Yakushev, Z.Zhang

COMPASS-A COMPAct decay spectroscopy set-up

RADIOACTIVITY 253No(α) [from 207Pb(48Ca, 2n), E not given]; measured decay products, Eγ, Iγ, Eα, Iα, α-γ-coin.; deduced α-decay spectrum, branching ratios.

doi: 10.1016/j.nima.2018.01.096
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2018DI11      Phys.Lett. B 784, 199 (2018)

A.Di Nitto, J.Khuyagbaatar, D.Ackermann, L.-L.Andersson, E.Badura, M.Block, H.Brand, I.Conrad, D.M.Cox, Ch.E.Dullmann, J.Dvorak, K.Eberhardt, P.A.Ellison, N.E.Esker, J.Even, C.Fahlander, U.Forsberg, J.M.Gates, P.Golubev, O.Gothe, K.E.Gregorich, W.Hartmann, R.D.Herzberg, F.P.Hessberger, J.Hoffmann, R.Hollinger, A.Hubner, E.Jager, B.Kindler, S.Klein, I.Kojouharov, J.V.Kratz, J.Krier, N.Kurz, S.Lahiri, B.Lommel, M.Maiti, R.Mandl, E.Merchan, S.Minami, A.K.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, G.K.Pang, D.Renisch, D.Rudolph, J.Runke, L.G.Sarmiento, M.Schadel, H.Schaffner, B.Schausten, A.Semchenkov, J.Steiner, P.Thorle-Pospiech, N.Trautmann, A.Turler, J.Uusitalo, D.Ward, M.Wegrzecki, P.Wieczorek, N.Wiehl, A.Yakushev, V.Yakusheva

Study of non-fusion products in the 50Ti + 249Cf reaction

NUCLEAR REACTIONS 249Cf(50Ti, X)211Po/212At/213Rn/214Fr/215Ra/222Ra/221Ra/223Ac/218Rn/224Th/219Fr/223Th/218Rn/219Fr/220Ra/214Po/219Ra/217Rn/215At, E=306 MeV; measured reaction products, Eα, Iα; deduced σ.

doi: 10.1016/j.physletb.2018.07.058
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2018KH05      Phys.Rev. C 97, 064618 (2018)

J.Khuyagbaatar, H.M.David, D.J.Hinde, I.P.Carter, K.J.Cook, M.Dasgupta, Ch.E.Dullmann, D.Y.Jeung, B.Kindler, B.Lommel, D.H.Luong, E.Prasad, D.C.Rafferty, C.Sengupta, C.Simenel, E.C.Simpson, J.F.Smith, K.Vo-Phuoc, J.Walshe, A.Wakhle, E.Williams, A.Yakushev

Nuclear structure dependence of fusion hindrance in heavy element synthesis

NUCLEAR REACTIONS 204,208Pb(48Ti, X), E=240.0, 245.0, 252.2, 259.0, 270.0, 280.0 MeV; 206,208Pb(50Ti, X), E=236.0, 240.0, 252.0, 258.0, 264.0, 270.0, 280.2 MeV; measured reaction products, mass ratio and angular distributions (MAD) of fragments, double differential σ(θ, MR), and widths using CUBE detector array at the Heavy Ion Accelerator Facility of Australian National University. 206Pb(36S, X), (34S, X), (48Ti, X), (50Ti, X), E*=25-60 MeV; calculated mean-squared angular momenta, widths and MR distributions, and compared with experimental data. Discussed impact of nuclear structure on fusion-evaporation reactions.

doi: 10.1103/PhysRevC.97.064618
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2018MI11      Acta Phys.Pol. B49, 613 (2018)

A.K.Mistry, Z.Zhang, F.P.Hessberger, D.Ackermann, B.Andel, S.Antalic, M.Block, P.Chhetri, F.Dechery, C.Droese, Ch.E.Dullmann, F.Giacoppo, J.Hoffmann, O.Kaleja, J.Khuyagbaatar, N.Kurz, M.Laatiaoui, J.Maurer, P.Mosat, J.Piot, S.Raeder, M.Vostinar, A.Yakushev

Decay Spectroscopy of Heavy Isotopes at SHIP Using the COMPASS Focal Plane Detection Set-up

RADIOACTIVITY 250Fm, 254No(α)[Nobelium from 48Ca(208Pb, 2n), E=4.55 MeV/nucleon]; measured Eα, Iα(time), αα-coin; deduced α-decay energy spectrum, Iα vs time, T1/2, αFmαNo correlation, T1/2. 222Th, 218Ra, 214Rn(α)[from α-decays 230Pu to 226U to 232Th to218Ra to 214Rn]; measured α-decay trace 222Th to 218Ra to n, Eα, Iα(time), αα-coin, αα-correlations; deduced summary of α-decay chains starting with 227U, 229Np, 229,230Pu using also literature references.

doi: 10.5506/aphyspolb.49.613
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2018RA11      Phys.Rev.Lett. 120, 232503 (2018)

S.Raeder, D.Ackermann, H.Backe, R.Beerwerth, J.C.Berengut, M.Block, A.Borschevsky, B.Cheal, P.Chhetri, Ch.E.Dullmann, V.A.Dzuba, E.Eliav, J.Even, R.Ferrer, V.V.Flambaum, S.Fritzsche, F.Giacoppo, S.Gotz, F.P.Hessberger, M.Huyse, U.Kaldor, O.Kaleja, J.Khuyagbaatar, P.Kunz, M.Laatiaoui, F.Lautenschlager, W.Lauth, A.K.Mistry, E.Minaya Ramirez, W.Nazarewicz, S.G.Porsev, M.S.Safronova, U.I.Safronova, B.Schuetrumpf, P.Van Duppen, T.Walther, C.Wraith, A.Yakushev

Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy

NUCLEAR MOMENTS 252,253,254No; measured excitation spectra, hyperfine structure components; deduced nuclear magnetic and quadrupole moments, charge radii. Comparison with the state-of-the-art nuclear density functional calculations.

doi: 10.1103/PhysRevLett.120.232503
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2018SA45      Phys.Rev. C 98, 044307 (2018)

A.Saamark-Roth, L.G.Sarmiento, D.Rudolph, J.Ljungberg, B.G.Carlsson, C.Fahlander, U.Forsberg, P.Golubev, I.Ragnarsson, D.Ackermann, L.-L.Andersson, M.Block, H.Brand, D.M.Cox, A.Di Nitto, Ch.E.Dullmann, K.Eberhardt, J.Even, J.M.Gates, J.Gerl, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, E.Jager, J.Khuyagbaatar, B.Kindler, I.Kojouharov, J.V.Kratz, J.Krier, N.Kurz, B.Lommel, A.Mistry, C.Mokry, J.P.Omtvedt, P.Papadakis, J.Runke, K.Rykaczewski, M.Schadel, H.Schaffner, B.Schausten, P.Thorle-Pospiech, N.Trautmann, T.Torres, A.Turler, A.Ward, N.Wiehl, A.Yakushev

Low-lying states in 219Ra and 215Rn: Sampling microsecond α-decaying nuclei

RADIOACTIVITY 219Ra(α)[from 243Am(48Ca, X), E=242.1, 245.0 MeV]; measured Eα, Iα, Eγ, Iγ, αγ-coin, α(x ray)-coin, α-α correlations using TASISpec at the TASCA, GSI facility. Pileup analysis and GEANT4 simulation of 219Ra to 215Rn decay. 219,219m,220,221Ra, 215,216,217Rn, 212,213Po, 219Fr, 215At(α); measured half-lives, Qα. 219Ra, 215Rn; deduced levels, J, π, isomer in 219Ra Comparison with shell model calculations and theoretical calculations of deformation, rotational states and α-decay rates, and with evaluated data in the ENSDF database.

doi: 10.1103/PhysRevC.98.044307
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2018TH02      Nature(London) 556, 321 (2018)

J.Thielking, M.V.Okhapkin, P.Glowacki, D.M.Meier, L.von der Wense, B.Seiferle, C.E.Dullmann, P.G.Thirolf, E.Peik

Laser spectroscopic characterization of the nuclear-clock isomer 229mTh

RADIOACTIVITY 233U(α); measured optical frequencies, recoil Eβ, Iβ; deduced optical detection of ions in the 229mTh isomeric state and of the resolved hyperfine structure, which arises from the interaction of the isomer nucleus with the valence electrons.

doi: 10.1038/s41586-018-0011-8
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2018WE04      Phys.Rev. C 97, 035803 (2018)

M.Weigand, T.Heftrich, Ch.E.Dullmann, K.Eberhardt, S.Fiebiger, J.Glorius, K.Gobel, R.Haas, C.Langer, S.Lohse, R.Reifarth, D.Renisch, C.Wolf

66.7-keV γ-line intensity of 171Tm determined via neutron activation

RADIOACTIVITY 171Er(β-)[from 170Er(n, γ), E=thermal]; 171Tm(β-)[from 171Er β- decay]; measured Eγ, Iγ, E(x rays), I(x rays), precise intensity of the 66.7-keV γ ray from the decay of 171Tm; deduced number of 171Er and 171Tm atoms produced in reactor irradiation. Relevance to 171Tm neutron capture cross section, and s process in thermally pulsing asymptotic giant branch stars.

doi: 10.1103/PhysRevC.97.035803
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2017GA14      Eur.Phys.J. Special Topics 226, 1623 (2017)

L.Gastaldo, K.Blaum, K.Chrysalidis, T.Day Goodacre, A.Domula, M.Door, H.Dorrer, Ch.E.Dullmann, K.Eberhardt, S.Eliseev, C.Enss, A.Faessler, P.Filianin, A.Fleischmann, D.Fonnesu, L.Gamer, R.Haas, C.Hassel, D.Hengstler, J.Jochum, K.Johnston, U.Kebschull, S.Kempf, T.Kieck, U.Koster, S.Lahiri, M.Maiti, F.Mantegazzini, B.Marsh, P.Neroutsos, Yu.N.Novikov, P.C.O.Ranitzsch, S.Rothe, A.Rischka, A.Saenz, O.Sander, F.Schneider, S.Scholl, R.X.Schussler, Ch.Schweiger, F.Simkovic, T.Stora, Z.Szucs, A.Turler, M.Veinhard, M.Weber, M.Wegner, K.Wendt and K.Zuber

The electron capture in 163Ho experiment - ECHo

RADIOACTIVITY 163Ho(EC); measured decay products, X-rays; calculated electron capture spectrum; deduced sensitivity towards neutrino mass measurements.

doi: 10.1140/epjst/e2017-70071-y
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2017GI07      Acta Phys.Pol. B48, 423 (2017)

F.Giacoppo, K.Blaum, M.Block, P.Chhetri, Ch.E.Dullmann, C.Droese, S.Eliseev, P.Filianin, S.Gotz, Y.Gusev, F.Herfurth, F.P.Hessberger, O.Kaleja, J.Khuyagbaatar, M.Laatiaoui, F.Lautenschlager, C.Lorenz, G.Marx, E.Minaya Ramirez, A.Mistry, Yu.N.Novikov, W.R.Plass, S.Raeder, D.Rodriguez, D.Rudolph, L.G.Sarmiento, C.Scheidenberger, L.Schweikhard, P.Thirolf, A.Yakushev

Recent Upgrades of the SHIPTRAP Setup: On the Finish Line Towards Direct Mass Spectroscopy of Superheavy Elements

doi: 10.5506/APhysPolB.48.423
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2017GO06      Nucl.Phys. A961, 1 (2017)

M.Gotz, S.Gotz, J.V.Kratz, Ch.E.Dullmann, Ch.Mokry, J.Runke, P.Thorle-Pospiech, N.Wiehl, M.Schadel, J.Ballof, H.Dorrer, J.Grund, D.Huber, E.Jager, O.Keller, J.Krier, J.Khuyagbaatar, L.Lens, B.Lommel, M.Mendel, K.J.Moody, P.Scharrer, B.Schausten, D.Shaughnessy, M.Schmitt, J.Steiner, N.Trautmann, A.Yakushev, V.Yakusheva

Radiochemical study of the kinematics of multi-nucleon transfer reactions in 48Ca + 248Cm collisions 10 percent above the Coulomb barrier

NUCLEAR REACTIONS 248Cm(48Ca, x), E=262 MeV; measured multinucleon transfer reaction products, Eα, Iα (for identification of the fragments); deduced TKE vs θ, E* vs θ for target-like (trans-target ones, like Fm, Es, Cf, Bk and others) fragments using radiochemical methods.

doi: 10.1016/j.nuclphysa.2017.02.006
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2017KO02      Phys.Lett. B 764, 265 (2017)

J.Konki, J.Khuyagbaatar, J.Uusitalo, P.T.Greenlees, K.Auranen, H.Badran, M.Block, R.Briselet, D.M.Cox, M.Dasgupta, A.Di Nitto, Ch.E.Dullmann, T.Grahn, K.Hauschild, A.Herzan, R.-D.Herzberg, F.P.Hessberger, D.J.Hinde, R.Julin, S.Juutinen, E.Jager, B.Kindler, J.Krier, M.Leino, B.Lommel, A.Lopez-Martens, D.H.Luong, M.Mallaburn, K.Nishio, J.Pakarinen, P.Papadakis, J.Partanen, P.Peura, P.Rahkila, K.Rezynkina, P.Ruotsalainen, M.Sandzelius, J.Saren, C.Scholey, J.Sorri, S.Stolze, B.Sulignano, Ch.Theisen, A.Ward, A.Yakushev, V.Yakusheva

Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk

RADIOACTIVITY 240Es(EC), (α), 236Bk(EC) [from 209Bi(34S, 3n)240Es, E=174, 178 MeV]; measured decay products, Eα, Iα; deduced T1/2, branching ratios, electron-capture delayed fission (ECDF) probability. Comparison with available data.

doi: 10.1016/j.physletb.2016.11.038
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2016FO10      Nucl.Phys. A953, 117 (2016)

U.Forsberg, D.Rudolph, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, C.Fahlander, J.M.Gates, P.Golubev, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, L.G.Sarmiento, M.Schadel, A.Yakushev, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, J.Dobaczewski, K.Eberhardt, J.Even, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, W.Nazarewicz, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, Y.Shi, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Recoil-α-fission and recoil-α-α- fission events observed in the reaction 48Ca + 243Am

NUCLEAR REACTIONS 243Am(48Ca, x), E=242.1, 245.0 MeV; measured reaction products, fission products, Eα, Iα(t), αα-coin, (recoil)α-coin, En, In using He-gas filled TASCA, TASISpec based on DSSSDs, other DSSSDs; deduced correlation times, α energy spectra, 23 α-decay chains of five α's and α+3n, fragments T1/2. Discussed existence of long decay chains; compared with published results.

RADIOACTIVITY 289,288Mc, 284Nh, 280Rg, 276Mt, 272Bh(α), 268Db(SF); measured decay products, Eα, Iα; deduced T1/2. Comparison with available data.

doi: 10.1016/j.nuclphysa.2016.04.025
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2016FO16      Phys.Lett. B 760, 293 (2016)

U.Forsberg, D.Rudolph, C.Fahlander, P.Golubev, L.G.Sarmiento, S.Aberg, M.Block, Ch.E.Dullmann, F.P.Hessberger, J.V.Kratz, A.Yakushev

A new assessment of the alleged link between element 115 and element 117 decay chains

NUCLEAR STRUCTURE 293Ts, 289Mc; analyzed available data; deduced cross-reaction link between α-decay chains.

doi: 10.1016/j.physletb.2016.07.008
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2016LA25      Nature(London) 535, 495 (2016)

M.Laatiaoui, W.Lauth, H.Backe, Mi.Block, D.Ackermann, B.Cheal, P.Chhetri, C.E.Dullmann, P.van Duppen, J.Even, R.Ferrer, F.Giacoppo, S.Gotz, F.P.Hessberger, M.Huyse, O.Kaleja, J.Khuyagbaatar, P.Kunz, F.Lautenschlager, A.K.Mistry, S.Raeder, E.Minaya Ramirez, T.Walther, C.Wraith, A.Yakushev

Atom-at-a-time laser resonance ionization spectroscopy of nobelium

NUCLEAR REACTIONS 206,208Pb(48Ca, 2n), E=217 MeV; measured reaction products; deduced σ, ground-state transition, an upper limit for the ionization potential of nobelium.

doi: 10.1038/nature19345
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2016WE07      Nature(London) 533, 47 (2016)

L.v.d.Wense, B.Seiferle, M.Laatiaoui, J.B.Neumayr, H.-J.Maier, H.-F.Wirth, C.Mokry, J.Runke, Kl.Eberhardt, C.E.Dullmann, N.G.Trautmann, P.G.Thirolf

Direct detection of the 229Th nuclear clock transition

RADIOACTIVITY 229Th(IT), (α); measured decay products, Eα, Iα; deduced isomer T1/2.

doi: 10.1038/nature17669
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2015EL03      Phys.Rev.Lett. 115, 062501 (2015)

S.Eliseev, K.Blaum, M.Block, S.Chenmarev, H.Dorrer, Ch.E.Dullmann, C.Enss, P.E.Filianin, L.Gastaldo, M.Goncharov, U.Koster, F.Lautenschlager, Yu.N.Novikov, A.Rischka, R.X.Schussler, L.Schweikhard, A.Turler

Direct Measurement of the Mass Difference of 163Ho and 163Dy Solves the Q-Value Puzzle for the Neutrino Mass Determination

ATOMIC MASSES 163Ho, 163Dy; measured period of the cyclotron frequencies; deduced Q-values, mass differences. Comparison with the Atomic Mass Evaluation 2012.

doi: 10.1103/PhysRevLett.115.062501
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2015GA24      Phys.Rev. C 92, 021301 (2015)

J.M.Gates, K.E.Gregorich, O.R.Gothe, E.C.Uribe, G.K.Pang, D.L.Bleuel, M.Block, R.M.Clark, C.M.Campbell, H.L.Crawford, M.Cromaz, A.Di Nitto, Ch.E.Dullmann, N.E.Esker, C.Fahlander, P.Fallon, R.M.Farjadi, U.Forsberg, J.Khuyagbaatar, W.Loveland, A.O.Macchiavelli, E.M.May, P.R.Mudder, D.T.Olive, A.C.Rice, J.Rissanen, D.Rudolph, L.G.Sarmiento, J.A.Shusterman, M.A.Stoyer, A.Wiens, A.Yakushev, H.Nitsche

Decay spectroscopy of element 115 daughters: 280Rg → 276Mt and 276Mt → 272Bh

NUCLEAR REACTIONS 243Am(48Ca, 3n)288Mc, E=262 MeV; measured evaporation residues (EVRs) by magnetic rigidities, Eα, SF-like events, decay chains using corner-cube-clover (C3) focal plane detector consisting of silicon-strip detectors surrounded by HPGe clover-type detectors, and DSSSDs for α particles at LBNL cyclotron facility; deduced data for forty-six decay chains from the decay of 288Mc and its α daughter products 284Nh, 280Rg, 276Mt, 272Bh, 268Db, the 268Db decaying by SF events.

RADIOACTIVITY 276Mt, 280Rg(α)[from α decay chain of 288Mc formed in 243Am(48Ca, 3n), E=262 MeV at LBNL cyclotron facility]; measured Eα, Iα, Eγ, Iγ, E(x rays), αγ-, α(x ray)-, γγ-coin, half-lives of 276Mt and 280Rg isotopes. 272Bh, 276Mt; deduced levels, multipolarities, α hindrance factors. GEANT4 simulations of α and photon spectra. No K-x rays were definitely assigned thus uncertain Z identification.

doi: 10.1103/PhysRevC.92.021301
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2015KH03      Phys.Rev. C 91, 054608 (2015)

J.Khuyagbaatar, D.J.Hinde, I.P.Carter, M.Dasgupta, Ch.E.Dullmann, M.Evers, D.H.Luong, R.du Rietz, A.Wakhle, E.Williams, A.Yakushev

Experimental study of the quasifission, fusion-fission, and de-excitation of Cf compound nuclei

NUCLEAR REACTIONS 206Pb(36S, X)242Cf*, 208Pb(34S, X)242Cf*, 198Pt(44Ca, X)242Cf*, 208Pb(36S, X)244Cf*, 235U(12C, X)247Cf*, at E*=28-52 MeV; measured fission fragment spectra, (fragment)(fragment)-coin, mass and angle distributions of fission fragments at Heavy Ion Accelerator Facility of the Australian National University; deduced mean squared angular momenta, (σRMSgaus), mass distribution of fission fragments of 244Cf* and 242Cf* following electron capture decay of 244Es and 242Es; deduced fractions of the mass asymmetric fission components, survival probabilities, shell effects in slow quasifission mass distributions. Coupled-channel calculations using CCFULL computer code. Comparison with calculations using general fission model computer code GEF.

doi: 10.1103/PhysRevC.91.054608
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2015KH09      Phys.Rev.Lett. 115, 242502 (2015)

J.Khuyagbaatar, A.Yakushev, Ch.E.Dullmann, D.Ackermann, L.L-.Andersson, M.Block, H.Brand, D.M.Cox, J.Even, U.Forsberg, P.Golubev, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, J.Hoffmann, A.Hubner, E.Jager, J.Jeppsson, b.Kindler, J.V.Kratz, J.Krier, N.Kurz, B.Lommel, M.Maiti, S.Minami, A.K.Mistry, C.M.Mrosek, I.Pysmenetska, D.Rudolph, L.G.Sarmiento, H.Schaffner, M.Schadel, B.Schausten, J.Steiner, T.Torres De Heidenreich, J.Uusitalo, M.Wegrzecki, N.Wiehl, V.Yakusheva

New Short-Lived Isotope 221U and the Mass Surface Near N = 126

RADIOACTIVITY 221,222U, 218Ac(α) [from 176Yb(50Ti, X)221U/222U, E=231-255 MeV]; measured decay products, Eα, Iα. 214,215Ra, 217,218,219Th, 214Fr, 221,222U; deduced T1/2, Q-values. A fast data readout technique, comparison with FRDM95 and HFB26 calculations.

doi: 10.1103/PhysRevLett.115.242502
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2015NI09      Phys.Lett. B 748, 89 (2015)

K.Nishio, A.N.Andreyev, R.Chapman, X.Derkx, Ch.E.Dullmann, L.Ghys, F.P.Hessberger, K.Hirose, H.Ikezoe, J.Khuyagbaatar, B.Kindler, B.Lommel, H.Makii, I.Nishinaka, T.Ohtsuki, S.D.Pain, R.Sagaidak, I.Tsekhanovich, M.Venhart, Y.Wakabayashi, S.Yan

Excitation energy dependence of fragment-mass distributions from fission of 180, 190Hg formed in fusion reactions of 36Ar + 144, 154Sm

NUCLEAR REACTIONS 144,154Sm(36Ar, X)180Hg/190Hg, E=148-198 MeV; measured reaction products; deduced fission fragment mass and total kinetic-energy distributions. Comparison with available data.

doi: 10.1016/j.physletb.2015.06.068
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2015PR07      Phys.Rev. C 91, 064605 (2015)

E.Prasad, D.J.Hinde, K.Ramachandran, E.Williams, M.Dasgupta, I.P.Carter, K.J.Cook, D.Y.Jeung, D.H.Luong, S.McNeil, C.S.Palshetkar, D.C.Rafferty, C.Simenel, A.Wakhle, J.Khuyagbaatar, Ch.E.Dullmann, B.Lommel, B.Kindler

Observation of mass-asymmetric fission of mercury nuclei in heavy ion fusion

NUCLEAR REACTIONS 142Nd(40Ca, X)182Hg*, E=167.7, 194.9, 199.9, 210.0, 221.1 MeV; 182W(13C, X)195Hg*, E=60.0, 63.0, 66.0 MeV; measured fission fragments mass rations and mass-angle distributions using the CUBE spectrometer at 14UD Pelletron facility of ANU-Canberra; deduced mass-asymmetric fission of 182Hg compound nucleus at E*=33.6 MeV, and mass-symmetric fission of 195Hg compound nucleus at all energies.Kinematic reconstruction method. Comparison with results from mass-asymmetric fission of 180Hg in beta-delayed fission process, and with theoretical predictions.

doi: 10.1103/PhysRevC.91.064605
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2015RU11      J.Radioanal.Nucl.Chem. 303, 1185 (2015)

D.Rudolph, U.Forsberg, P.Golubev, L.G.Sarmiento, A.Yakushev, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, J.M.Gates, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, M.Schadel, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, K.Eberhardt, J.Even, C.Fahlander, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Selected spectroscopic results on element 115 decay chains

RADIOACTIVITY 288Mc, 284Nh, 280Rg, 276Mt, 272Bh(α), 268Db(SF); measured decay products, Eα, Iα; deduced Q-values, level energies, branching ratios. Comparison with GEANT4 Monte-Carlo simulations.

doi: 10.1007/s10967-014-3445-y
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2015SC13      Eur.Phys.J. A 51, 89 (2015)

F.Schneider, T.Beyer, K.Blaum, M.Block, S.Chenmarev, H.Dorrer, Ch.E.Dullmann, K.Eberhardt, M.Eibach, S.Eliseev, J.Grund, U.Koster, Sz.Nagy, Yu.N.Novikov, D.Renisch, A.Turler, K.Wendt

Preparatory studies for a high-precision Penning-trap measurement of the 163Ho electron capture Q-value

doi: 10.1140/epja/i2015-15089-8
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2014EI01      Phys.Rev. C 89, 064318 (2014)

M.Eibach, T.Beyer, K.Blaum, M.Block, Ch.E.Dullmann, K.Eberhardt, J.Grund, Sz.Nagy, H.Nitsche, W.Nortershauser, D.Renisch, K.P.Rykaczewski, F.Schneider, C.Smorra, J.Vieten, M.Wang, K.Wendt

Direct high-precision mass measurements on 241, 243Am, 244Pu, and 249Cf

ATOMIC MASSES 241,243Am, 244Pu, 249Cf; measured Time-of-flight spectrum of carbon cluster ions, cyclotron frequencies by TOF-ICR technique using TRIGA-TRAP Penning-trap mass spectrometer at Mainz; deduced masses. Comparison with data in AME-2012. Analyzed AME-2012 masses of 84 nuclides in Z=82-112, N=129-166 region, and improved uncertainties with the use of new mass measurements in this work.

doi: 10.1103/PhysRevC.89.064318
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2014GA33      J.Low Temp.Physics 176, 876 (2014)

L.Gastaldo, K.Blaum, A.Doerr, Ch.E.Dullmann, K.Eberhardt, S.Eliseev, C.Enss, A.Faessler, A.Fleischmann, S.Kempf, M.Krivoruchenko, S.Lahiri, M.Maiti, Yu.N.Novikov, P.C.-O.Ranitzsch, F.Simkovic, Z.Szucs, M.Wegner

The Electron Capture 163Ho Experiment ECHo

RADIOACTIVITY 163Ho(EC); measured decay products, X-rays; deduced β-decay spectra, Q-values. Neutrino mass, metallic magnetic calorimeters, SQUID.

doi: 10.1007/s10909-014-1187-4
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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 T1/2. Comparison with experimental data.

doi: 10.1103/PhysRevLett.112.172501
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2014NI16      Nucl.Data Sheets 119, 299 (2014)

K.Nishio, H.Ikezoe, S.Hofmann, D.Ackermann, Y.Aritomo, V.F.Comas, Ch.E.Dullmann, S.Heinz, J.A.Heredia, F.P.Hessberger, K.Hirose, J.Khuyagbaatar, B.Kindler, I.Kojouharov, B.Lommel, M.Makii, R.Mann, S.Mitsuoka, I.Nishinaka, T.Ohtsuki, S.Saro, M.Schadel, A.G.Popeko, A.Turler, Y.Wakabayashi, Y.Watanabe, A.Yakushev, A.Yeremin

Study of Heavy-ion Induced Fission for Heavy Element Synthesis

NUCLEAR REACTIONS 238U(30Si, F), (34S, F), E*=30-68 MeV;238U(36S, F), E(cm)=140-180 MeV; measured reaction products; calculated σ; deduced σ. 238U(30Si, xn), E(cm)=125-160 MeV;238U(34S, xn), E(cm)=140-180 MeV; measured reaction products; deduced σ; calculated σ.

doi: 10.1016/j.nds.2014.08.082
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2014RU04      Acta Phys.Pol. B45, 263 (2014)

D.Rudolph, U.Forsberg, P.Golubev, L.G.Sarmiento, A.Yakushev, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, J.M.Gates, K.E.Gregorich, C.J.Gross, R.-D.Herzberg, F.P.Hessberger, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, M.Schadel, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, K.Eberhardt, J.Even, C.Fahlander, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains

RADIOACTIVITY 287,288Mc, 283,284Nh, 279,280Rg, 275,276Mt, 271,272Bh(α), 267,268Db(SF) [from 243Am(48Ca, X), E not given]; measured decay products, Eα, Iα, Eγ, Iγ, X-rays; deduced T1/2, correlated α-decay chains. Comparison with available data.

doi: 10.5506/APhysPolB.45.263
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2014YA33      Inorg. Chem. 53, 1624 (2014)

A.Yakushev, J.M.Gates, A.Turler, M.Schadel, C.E.Dullmann, D.Ackermann, L.-L.Andersson, M.Block, W.Bruchle, J.Dvorak, K.Eberhardt, H.G.Essel, J.Even, U.Forsberg, A.Gorshkov, R.Graeger, K.E.Gregorich, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.Hild, A.Hubner, E.Jager, J.Khuyagbaatar, B.Kindler, J.V.Kratz, J.Krier, N.Kurz, B.Lommel, L.J.Niewisch, H.Nitsche, J.P.Omtvedt, E.Parr, Z.Qin, D.Rudolph, J.Runke, B.Schausten, E.Schimpf, A.Semchenkov, J.Steiner, P.Thorle-Pospiech, J.Uusitalo, M.Wegrzecki, N.Wiehl

Superheavy Element Flerovium (Element 114) Is a Volatile Metal

NUCLEAR REACTIONS 244Pu(48Ca, Xn)288Fl/289Fl, E=259.4 MeV; measured reaction products, Eα, Iα; deduced two atoms of flerovium, the observed adsorption behavior of Fl points to a higher inertness compared to its nearest homologue in the group, Pb. However, the measured lower limit for the adsorption enthalpy of Fl on a Au surface points to the formation of a metal-metal bond of Fl with Au. Fl is the least reactive element in the group, but still a metal.

doi: 10.1021/ic4026766
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2013RU11      Phys.Rev.Lett. 111, 112502 (2013)

D.Rudolph, U.Forsberg, P.Golubev, L.G.Sarmiento, A.Yakushev, L.-L.Andersson, A.Di Nitto, Ch.E.Dullmann, J.M.Gates, K.E.Gregorich, C.J.Gross, F.P.Hessberger, R.-D.Herzberg, J.Khuyagbaatar, J.V.Kratz, K.Rykaczewski, M.Schadel, S.Aberg, D.Ackermann, M.Block, H.Brand, B.G.Carlsson, D.Cox, X.Derkx, K.Eberhardt, J.Even, C.Fahlander, J.Gerl, E.Jager, B.Kindler, J.Krier, I.Kojouharov, N.Kurz, B.Lommel, A.Mistry, C.Mokry, H.Nitsche, J.P.Omtvedt, P.Papadakis, I.Ragnarsson, J.Runke, H.Schaffner, B.Schausten, P.Thorle-Pospiech, T.Torres, T.Traut, N.Trautmann, A.Turler, A.Ward, D.E.Ward, N.Wiehl

Spectroscopy of Element 115 Decay Chains

RADIOACTIVITY 288Mc, 284Nh, 280Rg, 276Mt, 272Bh(α) [from 243Am(48Ca, X), E=5.4 MeV/nucleon]; measured decay products, Eα, Iα, Eγ, Iγ, X-rays. 280Rg, 276Mt; deduced T1/2, Q-value, α-decay scheme. Comparison with Monte Carlo calculations.

doi: 10.1103/PhysRevLett.111.112502
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2012DU02      Radiochim.Acta 100, 67 (2012)

C.E.Dullmann

Superheavy elements at GSI: a broad research program with element 114 in the focus of physics and chemistry

NUCLEAR REACTIONS 244Pu(48Ca, 3n), (48Ca, 4n), E not given; measured reaction products, Eα, Iα; deduced σ, α-chains.

doi: 10.1524/ract.2011.1842
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2012FO03      Acta Phys.Pol. B43, 305 (2012)

U.Forsberg, P.Golubev, L.G.Sarmiento, J.Jeppsson, D.Rudolph, L.-L.Andersson, D.Ackermann, M.Asai, M.Block, K.Eberhardt, J.Even, Ch.E.Dullmann, J.Dvorak, J.M.Gates, K.E.Gregorich, R.-D.Herzberg, F.P.Hessberger, E.Jager, J.Khuyagbaatar, I.Kojouharov, J.V.Kratz, J.Krier, N.Kurz, S.Lahiri, B.Lommel, M.Maiti, E.Merchan, J.P.Omtvedt, E.Parr, J.Runke, H.Schaffner, M.Schadel, A.Yakushev

First Experiment at TASCA Towards X-Ray Fingerprinting of Element 115 Decay Chains

NUCLEAR REACTIONS 208Pb(48Ca, 2n)254No, E=4.59 MeV/nucleon; measured reaction fusion-evaporation products; deduced distribution of evaporation residue. Comparison with theoretical calculations.

doi: 10.5506/APhysPolB.43.305
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2012MI27      Science 337, 1207 (2012)

E.Minaya-Ramirez, D.Ackermann, K.Blaum, M.Block, C.Droese, C.E.Dullmann, M.Dworschak, M.Eibach, S.Eliseev, E.Haettner, F.Herfurth, F.P.Hessberger, S.Hofmann, J.Ketelaer, G.Marx, M.Mazzocco, D.Nesterenko, Y.N.Novikov, W.R.Plass, D.Rodriguez, C.Scheidenberger, L.Schweikhard, P.G.Thirolf, C.Weber

Direct Mapping of Nuclear Shell Effects in the Heaviest Elements

ATOMIC MASSES 252,253,254,255No, 255,256Lr; measured time-of-flight ion-cyclotron-resonance; deduced frequency ratios, mass excess. Comparison with theoretical calculations, SHIPTRAP results.

doi: 10.1126/science.1225636
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2012SM01      Phys.Rev. C 85, 027601 (2012)

C.Smorra, T.Beyer, K.Blaum, M.Block, Ch.E.Dullmann, K.Eberhardt, M.Eibach, S.Eliseev, Sz.Nagy, W.Nortershauser, D.Renisch

Direct mass measurements of cadmium and palladium isotopes and their double-β transition Q values

ATOMIC MASSES 106,108,110Cd, 106,108,110Pd; measured cyclotron frequency ratios, masses and mass excesses by Penning-trap mass spectrometers SHIPTRAP and ISOLTRAP. Comparison with AME-2003 evaluation.

RADIOACTIVITY 106,108Cd(2β+), (2EC); 110Pd(2β-); measured Q values by Penning-trap mass spectrometers. Comparison with AME-2003 evaluation.

doi: 10.1103/PhysRevC.85.027601
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2012SM07      Phys.Rev. C 86, 044604 (2012)

C.Smorra, T.R.Rodriguez, T.Beyer, K.Blaum, M.Block, Ch.E.Dullmann, K.Eberhardt, M.Eibach, S.Eliseev, K.Langanke, G.Martinez-Pinedo, Sz.Nagy, W.Nortershauser, D.Renisch, V.M.Shabaev, I.I.Tupitsyn, N.A.Zubova

Q value and half-life of double-electron capture in 184Os

ATOMIC MASSES 184Os, 184W; measured time-of-flight and cyclotron frequency ratios using Penning-trap mass spectrometer TRIGA-TRAP; deduced mass excess, Q value for 2β decay.

RADIOACTIVITY 184Os(2EC); measured Q-value using Penning-trap; calculated nuclear matrix element, T1/2. Energy density functional (EDF) calculations.

doi: 10.1103/PhysRevC.86.044604
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2011DU17      Radiochim.Acta 99, 515 (2011)

C.E.Dullmann

Superheavy element studies with preseparated isotopes

doi: 10.1524/ract.2011.1852
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2011GA19      Phys.Rev. C 83, 054618 (2011)

J.M.Gates, Ch.E.Dullmann, M.Schadel, A.Yakushev, A.Turler, K.Eberhardt, J.V.Kratz, D.Ackermann, L.-L.Andersson, M.Block, W.Bruchle, J.Dvorak, H.G.Essel, P.A.Ellison, J.Even, U.Forsberg, J.Gellanki, A.Gorshkov, R.Graeger, K.E.Gregorich, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.Hild, A.Hubner, E.Jager, J.Khuyagbaatar, B.Kindler, J.Krier, N.Kurz, S.Lahiri, D.Liebe, B.Lommel, M.Maiti, H.Nitsche, J.P.Omtvedt, E.Parr, D.Rudolph, J.Runke, H.Schaffner, B.Schausten, E.Schimpf, A.Semchenkov, J.Steiner, P.Thorle-Pospiech, J.Uusitalo, M.Wegrzecki, N.Wiehl

First superheavy element experiments at the GSI recoil separator TASCA: The production and decay of element 114 in the 244Pu(48Ca, 3-4n) reaction

NUCLEAR REACTIONS 206Pb(48Ca, 2n)252No, E=231.2 MeV; 207Pb(48Ca, 2n)253No, E=231.2 MeV; 208Pb(48Ca, 2n)254No, E=231.2 MeV; 244Pu(48Ca, 3n)289Fl, E=254.6, 259.4 MeV; 244Pu(48Ca, 4n)288Fl, E=254.6, 259.4 MeV; measured evaporation residue spectra, Eα, Iα, fission fragment spectra, Eγ, αγ-, α(particle)-coin, production cross sections. TASCA recoil separator at GSI. Comparison with previous measurements. RADIOACTIVITY 252,253,254No, 288,289Fl(α), (SF); measured Eα, half-lives, branching ratios for α and SF decay modes, (evaporation residues)α- and (evaporation residues)(fission fragments)-correlations, αγ-, γ(SF events)-coin. 248Fm, 281Ds, 284,285Cn, (α); measured Eα, EVR-α-α correlations, Eγ, half-lives. 277Hs(SF); measured total kinetic energy (TKE), half-life.

doi: 10.1103/PhysRevC.83.054618
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2010DU06      Phys.Rev.Lett. 104, 252701 (2010)

Ch.E.Dullmann, M.Schadel, A.Yakushev, A.Turler, K.Eberhardt, J.V.Kratz, D.Ackermann, L.-L.Andersson, M.Block, W.Bruchle, J.Dvorak, H.G.Essel, P.A.Ellison, J.Even, J.M.Gates, A.Gorshkov, R.Graeger, K.E.Gregorich, W.Hartmann, R.-D.Herzberg, F.P.Hessberger, D.Hild, A.Hubner, E.Jager, J.Khuyagbaatar, B.Kindler, J.Krier, N.Kurz, S.Lahiri, D.Liebe, B.Lommel, M.Maiti, H.Nitsche, J.P.Omtvedt, E.Parr, D.Rudolph, J.Runke, B.Schausten, E.Schimpf, A.Semchenkov, J.Steiner, P.Thorle-Pospiech, J.Uusitalo, M.Wegrzecki, N.Wiehl

Production and Decay of Element 114: High Cross Sections and the New Nucleus 277Hs

NUCLEAR REACTIONS 244Pu(48Ca, 3n)289Fl, 244Pu(48Ca, 4n)288Fl, E=259.4, 254.6 MeV; measured reaction products, Eα, Iα; deduced σ, α-decay chains, T1/2.

RADIOACTIVITY 288,289Fl, 285Cn(α), 281Ds(α), 284Cn, 281Ds, 277Hs(SF); measured reaction products, Eα, Iα; deduced α-decay chains, T1/2.

doi: 10.1103/PhysRevLett.104.252701
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2010GR04      Phys.Rev. C 81, 061601 (2010)

R.Graeger, D.Ackermann, M.Chelnokov, V.Chepigin, Ch.E.Dullmann, J.Dvorak, J.Even, A.Gorshkov, F.P.Hessberger, D.Hild, A.Hubner, E.Jager, J.Khuyagbaatar, B.Kindler, J.V.Kratz, J.Krier, A.Kuznetsov, B.Lommel, K.Nishio, H.Nitsche, J.P.Omtvedt, O.Petrushkin, D.Rudolph, J.Runke, F.Samadani, M.Schadel, B.Schausten, A.Turler, A.Yakushev, Q.Zhi

Experimental study of the 238U(36S, 3-5n)269-271Hs reaction leading to the observation of 270Hs

NUCLEAR REACTIONS 238U(36S, 3n), (36S, 4n), (36S, 5n), E=256.4 MeV; measured reaction products using COMPACT system of efficient and rapid chemical-separation and online detection based on the cryo-thermo chromatography method. 269,270,271Hs; deduced production σ.

RADIOACTIVITY 269,270,271Hs, 265,267Sg(α); measured decay products, Iα, Eα; deduced T1/2, αα correlations; 261,263Rf, 264Sg(SF); measured decay products, Eα, Iα; deduced α-SF correlations.

doi: 10.1103/PhysRevC.81.061601
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2010NI14      Phys.Rev. C 82, 024611 (2010)

K.Nishio, S.Hofmann, F.P.Hessberger, D.Ackermann, S.Antalic, Y.Aritomo, V.F.Comas, Ch.E.Dullmann, A.Gorshkov, R.Graeger, K.Hagino, S.Heinz, J.A.Heredia, K.Hirose, H.Ikezoe, J.Khuyagbaatar, B.Kindler, I.Kojouharov, B.Lommel, R.Mann, S.Mitsuoka, Y.Nagame, I.Nishinaka, T.Ohtsuki, A.G.Popeko, S.Saro, M.Schadel, A.Turler, Y.Watanabe, A.Yakushev, A.V.Yeremin

Nuclear orientation in the reaction 34S+238U and synthesis of the new isotope 268Hs

NUCLEAR REACTIONS 238U(34S, xn)267Hs/268Hs, E=148-170 MeV; measured evaporation residues and Eα, Eγ, x-rays, (fragment)α-, (fragment)γ-coin, production σ, fission σ(E), mass distribution of fission fragments as a function of energy. Comparison of fission σ(E) with calculations based on the three-dimensional Langevin equation and deformed target nuclei. Coupled-channel calculations for mass distributions. 268,269Sg, 272,273Hs, 269,271,272Mt, 274,275,276,277Sg, 273,275,276Rg, 278,279,280,281Cn; theoretical estimates of production rates in 243Am, 244Pu, 248Cm(34S, xn), (36S, xn) reactions.

RADIOACTIVITY 267,268Hs(α)[from 238U(34S, X), E=163.0 MeV]; 263Sg, 259Rf(α); 264Sg(SF); measured Eα, Eγ, x-rays, (fragment)α-, (fragment)γ-coin, half-lives; deduced Qα. Systematics of Qα values for even-even Z=104-114 and N=150-170 nuclei.

doi: 10.1103/PhysRevC.82.024611
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2009DR02      Phys.Rev. C 79, 011602 (2009)

I.Dragojevic, K.E.Gregorich, Ch.E.Dullmann, J.Dvorak, P.A.Ellison, J.M.Gates, S.L.Nelson, L.Stavsetra, H.Nitsche

New isotope 263Hs

NUCLEAR REACTIONS 208Pb(56Fe, n), E=276.4 MeV; measured σ.

RADIOACTIVITY 263Hs, 259Sg, 255Rf, 251No, 247Fm(α); measured Eα, half-lives.

doi: 10.1103/PhysRevC.79.011602
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2009DV01      Phys.Rev. C 79, 037602 (2009)

J.Dvorak, W.Bruchle, Ch.E.Dullmann, Z.Dvorakova, K.Eberhardt, R.Eichler, E.Jager, Y.Nagame, Z.Qin, M.Schadel, B.Schausten, E.Schimpf, R.Schuber, A.Semchenkov, P.Thorle, A.Turler, M.Wegrzecki, A.Yakushev

Cross section limits for the 248Cm(25Mg, 4n-5n)268, 269Hs reactions

NUCLEAR REACTIONS 248Cm(25Mg, 4n)269Hs, (25Mg, 5n)268Hs, E(cm)=140 MeV; measured α, fission events, α-SF and α-α correlations, production cross section limits. No events were assigned to 268Hs and 269Hs.

RADIOACTIVITY 268Hs, 269Hs(α); measured Eα, half-lives.

doi: 10.1103/PhysRevC.79.037602
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2009FO02      Phys.Rev. C 79, 027602 (2009)

C.M.Folden III, I.Dragojevic, Ch.E.Dullmann, R.Eichler, M.A.Garcia, J.M.Gates, S.L.Nelson, R.Sudowe, K.E.Gregorich, D.C.Hoffman, H.Nitsche

Measurement of the 208Pb(52Cr, n)259Sg excitation function

NUCLEAR REACTIONS 208Pb(52Cr, n)259Sg, E=250.7-266.2 MeV; 208Pb(52Cr, 2n)258Sg, E=250.7-266.2 MeV. Measured excitation functions, σ.

RADIOACTIVITY 259Sg, 258Sg, 255Rf(α), (SF), (EC), 251No(α); measured Eα, half-lives, decay modes.

doi: 10.1103/PhysRevC.79.027602
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2008DR05      Phys.Rev. C 78, 024605 (2008)

I.Dragojevic, K.E.Gregorich, Ch.E.Dullmann, M.A.Garcia, J.M.Gates, S.L.Nelson, L.Stavsetra, R.Sudowe, H.Nitsche

Influence of projectile neutron number in the 208Pb(48Ti, n)255Rf and 208Pb(50Ti, n)257Rf reactions

NUCLEAR REACTIONS 208Pb(48Ti, n), (48Ti, 2n), (50Ti, n), (50Ti, 2n), E=4.6-4.8 MeV/nucleon; measured excitation functions, σ.

RADIOACTIVITY 254,255,256,257Rf(α); measured Eα, Iα, half-lives.

doi: 10.1103/PhysRevC.78.024605
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2008DU09      Phys.Rev. C 77, 064320 (2008); Erratum Phys.Rev. C 78, 029901 (2008)

Ch.E.Dullmann, A.Turler

248Cm(22Ne, xn)270-xSg reaction and the decay properties of 265Sg reexamined

RADIOACTIVITY 269Hs, 265Sg, 261Rf(α); analyzed α-spectra. 265Sg; deduced half-lives, existence of isomeric state. 257NO;A. X:A-SPECTRA;A. N:265SG;B. D:T1/2;B.

NUCLEAR REACTIONS 248Cm(22Ne, 5n)E=105-130 MeV; analyzed σ.

doi: 10.1103/PhysRevC.77.064320
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2008DV02      Phys.Rev.Lett. 100, 132503 (2008)

J.Dvorak, W.Bruchle, M.Chelnokov, Ch.E.Dullmann, Z.Dvorakova, K.Eberhardt, E.Jager, R.Krucken, A.Kuznetsov, Y.Nagame, F.Nebel, K.Nishio, R.Perego, Z.Qin, M.Schadel, B.Schausten, E.Schimpf, R.Schuber, A.Semchenkov, P.Thorle, A.Turler, M.Wegrzecki, B.Wierczinski, A.Yakushev, A.Yeremin

Observation of the 3n Evaporation Channel in the Complete Hot-Fusion Reaction 26Mg+248Cm Leading to the New Superheavy Nuclide 271Hs

NUCLEAR REACTIONS 248Cm(26Mg, xn)269Hs/270Hs/271Hs, E=13-15 MeV; measured production σ. 271Hs; deduced T1/2.

doi: 10.1103/PhysRevLett.100.132503
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2008GA08      Phys.Rev. C 77, 034603 (2008)

J.M.Gates, M.A.Garcia, K.E.Gregorich, Ch.E.Dullmann, I.Dragojevic, J.Dvorak, R.Eichler, C.M.Folden III, W.Loveland, S.L.Nelson, G.K.Pang, L.Stavsetra, R.Sudowe, A.Turler, H.Nitsche

Synthesis of rutherfordium isotopes in the 238U(26Mg, xn)264-xRf reaction and study of their decay properties

NUCLEAR REACTIONS 238U(26Mg, 3n), (26Mg, 4n), (26Mg, 5n), (26Mg, 6n), E=4.9-6.0 MeV/nucleon; measured excitation functions, σ, half-lives, cross sections.

RADIOACTIVITY 258Rf(α) [from 238U(26Mg, 6n), E=4.9-6.0 MeV/nucleon]; 259Rf(EC) [from 238U(26Mg, 5n), E=4.9-6.0 MeV/nucleon]; 260Rf(α), (SF) [from 238U(26Mg, 4n), E=4.9-6.0 MeV/nucleon]; 261Rf(α), (SF) [from 238U(26Mg, 3n), E=4.9-6.0 MeV/nucleon]; 254No(α); measured α spectra, Q-values, charged particle spectra.242,244,246,248,250,252,254,256,258Fm, 248,250,252,254,256No, 250,252,254,256Rf, 252,254,256,258,260Sg; systematics.

doi: 10.1103/PhysRevC.77.034603
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2008GA25      Phys.Rev. C 78, 034604 (2008)

J.M.Gates, S.L.Nelson, K.E.Gregorich, I.Dragojevic, Ch.E.Dullmann, P.A.Ellison, C.M.Folden III, M.A.Garcia, L.Stavsetra, R.Sudowe, D.C.Hoffman, H.Nitsche

Comparison of reactions for the production of 258, 257Db: 208Pb(51V, xn) and 209Bi(50Ti, xn)

NUCLEAR REACTIONS 208Pb(51V, n), (51V, 2n), E=4.7-5.1 MeV/nucleon; measured excitation function, σ. 209Bi(50Ti, n), (50Ti, 2n); systematics of excitation functions, σ.

RADIOACTIVITY 257,258Db, 253,254Lr, 249,250Md, 246Cf, 250Fm, 254No, 245Es(α); measured α-spectra, half-lives.

doi: 10.1103/PhysRevC.78.034604
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2008NE08      Phys.Rev. C 78, 024606 (2008)

S.L.Nelson, C.M.Folden III, K.E.Gregorich, I.Dragojevic, Ch.E.Dullmann, R.Eichler, M.A.Garcia, J.M.Gates, R.Sudowe, H.Nitsche

Comparison of complementary reactions for the production of 261, 262Bh

NUCLEAR REACTIONS 208Pb(55Mn, n), (55Mn, 2n), E=273, 278, 283 MeV; 209Bi(54Cr, n), (54Cr, 2n), E=253.5-272.3 MeV; measured excitation functions, σ, half-lives.

doi: 10.1103/PhysRevC.78.024606
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2007DU22      Eur.Phys.J. D 45, 75 (2007)

Ch.E.Dullmann

Physical preseparation: A powerful new method for transactinide chemists

doi: 10.1140/epjd/e2007-00033-9
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2007OM01      Eur.Phys.J. D 45, 91 (2007)

J.P.Omtvedt, J.Alstad, T.Bjornstad, Ch.E.Dullmann, K.E.Gregorich, D.C.Hoffman, H.Nitsche, K.Opel, D.Polakova, F.Samadani, F.Schulz, G.Skarnemark, L.Stavsetra, R.Sudowe, L.Zheng

Chemical properties of the transactinide elements studied in liquid phase with SISAK

doi: 10.1140/epjd/e2007-00214-6
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2006DV01      Phys.Rev.Lett. 97, 242501 (2006)

J.Dvorak, W.Bruchle, M.Chelnokov, R.Dressler, Ch.E.Dullmann, K.Eberhardt, V.Gorshkov, E.Jager, R.Krucken, A.Kuznetsov, Y.Nagame, F.Nebel, Z.Novackova, Z.Qin, M.Schadel, B.Schausten, E.Schimpf, A.Semchenkov, P.Thorle, A.Turler, M.Wegrzecki, B.Wierczinski, A.Yakushev, A.Yeremin

Doubly Magic Nucleus 270108Hs162

RADIOACTIVITY 269,270Hs, 265Sg(α) [from 248Cm(26Mg, xn) and subsequent decay]; measured Eα, T1/2. 266Sg(SF) [from 270Hs decay]; measured T1/2. Rapid chemical separation.

NUCLEAR REACTIONS 248Cm(26Mg, 4n), (26Mg, 5n), E=136, 145 MeV; measured delayed Eα, αα-coin; deduced production σ.

doi: 10.1103/PhysRevLett.97.242501
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2006EI01      Radiochim.Acta 94, 181 (2006)

R.Eichler, W.Bruchle, R.Buda, S.Burger, R.Dressler, Ch.E.Dullmann, J.Dvorak, K.Eberhardt, B.Eichler, C.M.Folden III, H.W.Gaggeler, K.E.Gregorich, F.Haenssler, D.C.Hoffman, H.Hummrich, E.Jager, J.V.Kratz, B.Kuczewski, D.Liebe, D.Nayak, H.Nitsche, D.Piguet, Z.Qin, U.Rieth, M.Schadel, B.Schausten, E.Schimpf, A.Semchenkov, S.Soverna, R.Sudowe, N.Trautmann, P.Thorle, A.Turler, B.Wierczinski, N.Wiehl, P.A.Wilk, G.Wirth, A.B.Yakushev, A.von Zweidorf

Attempts to chemically investigate element 112

NUCLEAR REACTIONS 238U(48Ca, X), E=231, 235 MeV; measured delayed fission, Eα, (fission)α-coin; deduced no evidence for 283Cn. Thermochromatography.

doi: 10.1524/ract.2006.94.4.181
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2006FO02      Phys.Rev. C 73, 014611 (2006)

C.M.Folden III, S.L.Nelson, Ch.E.Dullmann, J.M.Schwantes, R.Sudowe, P.M.Zielinski, K.E.Gregorich, H.Nitsche, D.C.Hoffman

Excitation function for the production of 262Bh (Z = 107) in the odd-Z-projectile reaction 208Pb(55Mn, n)

NUCLEAR REACTIONS 208Pb(55Mn, n), E=260, 264, 268 MeV; measured delayed Eα, αα-coin, excitation function. 208Pb(55Mn, 2n), E=268 MeV; measured delayed Eα, αα-coin; deduced evidence for 261Bh. Gas-filled separator.

RADIOACTIVITY 261,262,262mBh, 257,258Db, 253m,254Lr, 254No, 250Fm(α) [from 208Pb(55Mn, xn) and subsequent decay]; measured Eα, T1/2.

doi: 10.1103/PhysRevC.73.014611
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1735.


2006GR24      Phys.Rev. C 74, 044611 (2006)

K.E.Gregorich, J.M.Gates, Ch.E.Dullmann, R.Sudowe, S.L.Nelson, M.A.Garcia, I.Dragojevic, C.M.Folden III, S.H.Neumann, D.C.Hoffman, H.Nitsche

New isotope 264Sg and decay properties of 262-264Sg

NUCLEAR REACTIONS 238U(30Si, 4n), (30Si, 5n), (30Si, 6n), E=147-174 MeV; measured delayed Eα, (recoil)α-coin; deduced excitation functions.

RADIOACTIVITY 262,264Sg(SF); measured T1/2, α-decay branching upper limit. 263Sg(SF), (α); measured T1/2, branching ratio. 259Rf, 255No; measured T1/2.

doi: 10.1103/PhysRevC.74.044611
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1512. Data from this article have been entered in the XUNDL database. For more information, click here.


2005DU23      Nucl.Instrum.Methods Phys.Res. A551, 528 (2005)

Ch.E.Dullmann, C.M.Folden III, K.E.Gregorich, D.C.Hoffman, D.Leitner, G.K.Pang, R.Sudowe, P.M.Zielinski, H.Nitsche

Heavy-ion-induced production and physical preseparation of short-lived isotopes for chemistry experiments

NUCLEAR REACTIONS Ge(18O, X)83mSr/83Y/84mY/88mY/85Zr/87Zr, E=82.8 GeV; 84Se(18O, X)86mY/85Zr/87Nb/87mNb/88Nb/88Mo, E=82.7 MeV; 124Sn(50Ti, X)168mLu/167Hf/168Hf, E=223.7 MeV; 116Sn(50Ti, X)162Tm/161Yb/162Yb/163Yb/162Lu/162Hf, E=224.4 MeV; measured delayed Eγ, Iγ following residual nucleus decay. Physical preseparation technique.

doi: 10.1016/j.nima.2005.05.077
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2005GR19      Phys.Rev. C 72, 014605 (2005)

K.E.Gregorich, W.Loveland, D.Peterson, P.M.Zielinski, S.L.Nelson, Y.H.Chung, Ch.E.Dullmann, C.M.Folden III, K.Aleklett, R.Eichler, D.C.Hoffman, J.P.Omtvedt, G.K.Pang, J.M.Schwantes, S.Soverna, P.Sprunger, R.Sudowe, R.E.Wilson, H.Nitsche

Attempt to confirm superheavy element production in the 48Ca + 238U reaction

NUCLEAR REACTIONS 238U(48Ca, 3n), E=230.3, 235.6 MeV; measured σ upper limits; deduced no evidence for 283Cn. Comparison with previous results.

doi: 10.1103/PhysRevC.72.014605
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2005SO17      Radiochim.Acta 93, 1 (2005)

S.Soverna, R.Dressler, Ch.E.Dullmann, B.Eichler, R.Eichler, H.W.Gaggeler, F.Haenssler

Thermochromatographic studies of mercury and radon on transition metal surfaces

doi: 10.1524/ract.93.1.1.58298
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2004FO08      Phys.Rev.Lett. 93, 212702 (2004)

C.M.Folden III, K.E.Gregorich, Ch.E.Dullmann, H.Mahmud, G.K.Pang, J.M.Schwantes, R.Sudowe, P.M.Zielinski, H.Nitsche, D.C.Hoffman

Development of an Odd-Z-Projectile Reaction for Heavy Element Synthesis: 208Pb(64Ni, n)271Ds and 208Pb(65Cu, n)272Rg

NUCLEAR REACTIONS 208Pb(64Ni, n), E=311.5, 314.3 MeV; 208Pb(65Cu, n), E=321 MeV; measured measured αα-coin following residual nucleus decay; deduced σ. Gas-filled separator.

RADIOACTIVITY 271Ds, 267Hs, 263mSg, 259Rf, 255No(α) [from 208Pb(64Ni, n) and subsequent decay]; 272Rg, 268Mt, 264Bh, 260Db, 256Lr(α) [from 208Pb(65Cu, n) and subsequent decay]; measured Eα, T1/2. Gas-filled separator.

doi: 10.1103/PhysRevLett.93.212702
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2004GA18      Nucl.Phys. A734, 208 (2004)

H.W.Gaggeler, W.Bruchle, Ch.E.Dullmann, R.Dressler, K.Eberhardt, B.Eichler, R.Eichler, C.M.Folden, T.N.Ginter, F.Glaus, K.E.Gregorich, F.Haenssler, D.C.Hoffman, E.Jager, D.T.Jost, U.W.Kirbach, J.V.Kratz, H.Nitsche, J.B.Patin, V.Pershina, D.Piguet, Z.Qin, U.Rieth, M.Schadel, E.Schimpf, B.Schausten, S.Soverna, R.Sudowe, P.Thorle, N.Trautmann, A.Turler, A.Vahle, P.A.Wilk, G.Wirth, A.B.Yakushev, A.von Zweidorf

Chemical and nuclear studies of hassium and element 112

NUCLEAR REACTIONS 248Cm(26Mg, 4n), (26Mg, 5n), E=145 MeV; 238U(48Ca, 3n), E=239 MeV; measured yields. Chemical properties discussed.

doi: 10.1016/j.nuclphysa.2004.01.036
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2003DU27      Czech.J.Phys. (Supplement) 53, A291 (2003)

Ch.E.Dullmann, R.Dressler, B.Eichler, H.W.Gaggeler, F.Glaus, D.T.Jost, D.Piguet, S.Soverna, A.Turler, W.Bruchle, R.Eichler, E.Jager, V.Pershina, M.Schadel, B.Schausten, E.Schimpf, H.-J.Schott, G.Wirth, K.Eberhardt, P.Thorle, N.Trautmann, T.N.Ginter, K.E.Gregorich, D.C.Hoffman, U.W.Kirbach, D.M.Lee, H.Nitsche, J.B.Patin, R.Sudowe, P.M.Zielinski, S.N.Timokhin, A.B.Yakushev, A.Vahle, Z.Qin

First chemical investigation of hassium (Hs, Z=108)

RADIOACTIVITY 269,270Hs(α); measured Eα, Iα.

doi: 10.1007/s10582-003-0037-4
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2003TU05      Eur.Phys.J. A 17, 505 (2003)

A.Turler, Ch.E.Dullmann, H.W.Gaggeler, U.W.Kirbach, A.B.Yakushev, M.Schadel, W.Bruchle, R.Dressler, K.Eberhardt, B.Eichler, R.Eichler, T.N.Ginter, F.Glaus, K.E.Gregorich, D.C.Hoffman, E.Jager, D.T.Jost, D.M.Lee, H.Nitsche, J.B.Patin, V.Pershina, D.Piguet, Z.Qin, B.Schausten, E.Schimpf, H.-J.Schott, S.Soverna, R.Sudowe, P.Thorle, S.N.Timokhin, N.Trautmann, A.Vahle, G.Wirth, P.M.Zielinski

On the decay properties of 269Hs and indications for the new nuclide 270Hs

NUCLEAR REACTIONS 248Cm(26Mg, xn), E=143.7-146.8 MeV; measured residual nucleus decay; deduced evidence for 269,270Hs. Chemical separation.

RADIOACTIVITY 269,270Hs, 265,266Sg, 261Rf, 257No(α) [from 248Cm(26Mg, xn) and subsequent decay]; measured Eα, T1/2. 261,262Rf(SF); measured fission fragment energies.

doi: 10.1140/epja/i2002-10163-0
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2002DU21      Nature(London) 418, 859 (2002)

Ch.E.Dullmann, W.Bruchle, R.Dressler, K.Eberhardt, B.Eichler, R.Eichler, H.W.Gaggeler, T.N.Ginter, F.Glaus, K.E.Gregorich, D.C.Hoffman, E.Jager, D.T.Jost, U.W.Kirbach, D.M.Lee, H.Nitsche, J.B.Patin, V.Pershina, D.Piguet, Z.Qin, M.Schadel, B.Schausten, E.Schimpf, H.-J.Schott, S.Soverna, R.Sudowe, P.Thorle, S.N.Timokhin, N.Trautmann, A.Turler, A.Vahle, G.Wirth, A.B.Yakushev, P.M.Zielinski

Chemical investigation of hassium (element 108)

RADIOACTIVITY 269,270Hs, 265,266Sg, 261Rf(α) [from 248Cm(26Mg, xn) and subsequent decay]; measured Eα. Chemical properties of hassium discussed.

doi: 10.1038/nature00980
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2002DU22      Nucl.Instrum.Methods Phys.Res. A479, 631 (2002)

Ch.E.Dullmann, B.Eichler, R.Eichler, H.W.Gaggeler, D.T.Jost, D.Piguet, A.Turler

IVO, a device for In situ Volatilization and On-line detection of products from heavy ion reactions

RADIOACTIVITY 197,197m,198,199m,200,201mPo(α); 172,173Os(α) [from 156Dy(22Ne, xn)]; 183,184,185Hg(α) [from 168Yb(22Ne, xn)]; measured Eα, T1/2.

NUCLEAR REACTIONS 156Dy(22Ne, 5n), (22Ne, 6n), E=127 MeV; 162Er(18O, 6n), (18O, 7n), E=116 MeV; measured radiochemical yields.

doi: 10.1016/S0168-9002(01)00898-1
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