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NSR database version of May 24, 2024.

Search: Author = L.Nies

Found 4 matches.

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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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2023NI07      Phys.Rev.Lett. 131, 022502 (2023)

L.Nies, D.Atanasov, M.Athanasakis-Kaklamanakis, M.Au, K.Blaum, J.Dobaczewski, B.S.Hu, J.D.Holt, J.Karthein, I.Kulikov, Y.A.Litvinov, D.Lunney, V.Manea, T.Miyagi, M.Mougeot, L.Schweikhard, A.Schwenk, K.Sieja, F.Wienholtz

Isomeric Excitation Energy for 99Inm from Mass Spectrometry Reveals Constant Trend Next to Doubly Magic 100Sn

ATOMIC MASSES 99,100,101In; measured TOF; deduced mass excess, excitation energies. The ISOLTRAP mass spectrometer at ISOLDE/CERN.

RADIOACTIVITY 99In(IT); measured decay products; deduced excitation energy with small uncertainty, intriguing constancy of the isomer excitation energies in neutron-deficient indium that persists down to the N=50 shell closure, even when all neutrons are removed from the valence shell. Comparison with large-scale shell model, ab initio, and density functional theory calculations.

doi: 10.1103/PhysRevLett.131.022502
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2023NI10      Phys.Rev.Lett. 131, 222503 (2023)

L.Nies, L.Canete, D.D.Dao, S.Giraud, A.Kankainen, D.Lunney, F.Nowacki, B.Bastin, M.Stryjczyk, P.Ascher, K.Blaum, R.B.Cakirli, T.Eronen, P.Fischer, M.Flayol, V.Girard Alcindor, A.Herlert, A.Jokinen, A.Khanam, U.Koster, D.Lange, I.D.Moore, M.Muller, M.Mougeot, D.A.Nesterenko, H.Penttila, C.Petrone, I.Pohjalainen, A.de Roubin, V.Rubchenya, Ch.Schweiger, L.Schweikhard, M.Vilen, J.Aysto

Further Evidence for Shape Coexistence in 79Znm near Doubly Magic 78Ni

ATOMIC MASSES 79Zn; measured frequencies, TOF; deduced the excitation energy of the 1/2+ isomer, the bandhead of a low-lying deformed structure akin to a predicted low-lying deformed band, shape coexistence. Comparison with state-of-the-art shell-model diagonalizations, complemented with discrete nonorthogonal shell-model calculations. The time-of-flight ion cyclotron resonance (TOF-ICR) method, the JYFLTRAP double Penning trap at the ion guide isotope separator on-line (IGISOL) facility in Jyvaskyla (Finland), and the multi-reflection time-of-flight mass spectrometer (MR-TOF MS) of ISOLTRAP at ISOLDE at CERN (Switzerland).

doi: 10.1103/PhysRevLett.131.222503
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2021DA16      Phys.Rev. C 104, 054322 (2021)

T.Day Goodacre, A.V.Afanasjev, A.E.Barzakh, L.Nies, B.A.Marsh, S.Sels, U.C.Perera, P.Ring, F.Wienholtz, A.N.Andreyev, P.Van Duppen, N.A.Althubiti, B.Andel, D.Atanasov, R.S.Augusto, J.Billowes, K.Blaum, T.E.Cocolios, J.G.Cubiss, G.J.Farooq-Smith, D.V.Fedorov, V.N.Fedosseev, K.T.Flanagan, L.P.Gaffney, L.Ghys, A.Gottberg, M.Huyse, S.Kreim, P.Kunz, D.Lunney, K.M.Lynch, V.Manea, Y.Martinez Palenzuela, T.M.Medonca, P.L.Molkanov, M.Mougeot, J.P.Ramos, M.Rosenbusch, R.E.Rossel, S.Rothe, L.Schweikhard, M.D.Seliverstov, P.Spagnoletti, C.Van Beveren, M.Veinhard, E.Verstraelen, A.Welker, K.Wendt, R.N.Wolf, A.Zadvornaya, K.Zuber

Charge radii, moments, and masses of mercury isotopes across the N=126 shell closure

NUCLEAR MOMENTS 198,202,203,206,207,208Hg; measured hyperfine structure spectra using Versatile Arc Discharge and Laser Ion Source (VADLIS) in CERN-ISOLDE Resonance Ionization Laser Ion Source (RILIS) mode; deduced isotope shifts (δν) and charge radii (δ<r2) with respect to 198Hg, hyperfine factors a and b, static magnetic dipole (μ) and electric quadrupole (Q) moments for the ground states of 203Hg and 207Hg, Comparison of g factors with Schmidt values for 207Hg, 209Pb, 210Bi and 211Po, and charge radii, and odd-even staggering (OES) of the mean square charge radii with relativistic Hartree-Bogoliubov (RHB) calculations using DD-ME2, DD-MEδ, DD-PC1 and NL3* covariant energy-density functionals for 197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214Pb, 201,202,203,204,205,206,207,208,209,210Hg. Source of Hg isotopes were produced in Pb(p, X), E=1.4 GeV reaction, and using VADLIS+RILIS ion source, followed by separation of fragments using ISOLDE General Purpose Separator. 183,184,185,202,203,206,207,208Hg; measured ionization and release efficiency as a function of the half-life of mercury isotopes from a molten lead target, and compared with ABRABLA, FLUKA, and GEANT4 simulations.

ATOMIC MASSES 206,207,208Hg, 208Pb; measured time-of-flight ion-cyclotron resonances, with reference to 208Pb using the RILIS+VADIS ion source and ISOLTRAP MR-ToF mass spectrometer (MS) at CERN-ISOLDE; deduced mass excesses for 206,207,208Hg, and compared with AME2020 values.

doi: 10.1103/PhysRevC.104.054322
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