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1. Rapid extraction of short-lived isotopes from a buffer gas cell for use in gas-phase chemistry experiments, Part II: On-line studies with short-lived accelerator-produced radionuclides

Author

Götz, S., Raeder, S., Block, M., Düllmann, Ch.E., Folden, C.M., III, Glennon, K.J., Götz, M., Hübner, A., Jäger, E., Kaleja, O., Khuyagbaatar, J., Kindler, B., Krier, J., Lens, L., Lommel, B., Mistry, A.K., Mokry, Ch., Runke, J., Såmark-Roth, A., Tereshatov, E.E., Thörle-Pospiech, P., Volia, M.F., Yakushev, A., and Yakusheva, V.

Published
2021
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5. COMPASS—A COMPAct decay spectroscopy set-up

Author

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

Published
2018
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7. Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP

Author

Kaleja, O., primary, Anđelić, B., additional, Bezrodnova, O., additional, Blaum, K., additional, Block, M., additional, Chenmarev, S., additional, Chhetri, P., additional, Droese, C., additional, Düllmann, Ch. E., additional, Eibach, M., additional, Eliseev, S., additional, Even, J., additional, Filianin, P., additional, Giacoppo, F., additional, Götz, S., additional, Gusev, Yu., additional, Gutiérrez, M. J., additional, Heßberger, F. P., additional, Kalantar-Nayestanaki, N., additional, van de Laar, J. J. W., additional, Laatiaoui, M., additional, Lohse, S., additional, Martynova, N., additional, Minaya Ramirez, E., additional, Mistry, A. K., additional, Murböck, T., additional, Novikov, Yu., additional, Raeder, S., additional, Rodríguez, D., additional, Schneider, F., additional, Schweikhard, L., additional, Thirolf, P. G., additional, and Yakushev, A., additional

Published
2022
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8. Research of the NUSTAR departments : SHE departments and HIM SHE section

Author

Block, Michael, Düllmann, Christoph Emanuel, Andelic, B., Boehland, S., Chauveau, P., Chenmarev, S., Chhetri, P., Giacoppo, F., Götz, M., Götz, S., Haas, R., Heßberger, F. P., Kaleja, O., Khuyagbaatar, J., Kieck, T., Lohse, S., Meyer, C.-C., Mistry, A. K., Nothhelfer, S., Pershina, V., Raeder, Sebastian, Renisch, D., Rudolph, Dirk, Yakushev, Aleaxander, Leifels, Yvonne, and Große, Katrin

Subjects
superheavy elements, Subatomic Physics
Abstract

The SHE departments devoted to the research of superheavy elements, operate the recoil separators SHIP and TASCA and their ancillary installations including SHIPTRAP and a laser spectroscopy setup at SHIP as well as chemistry and nuclear spectroscopy setups at TASCA. In 2019, the activities at GSI focused on the UNILAC beamtime within the FAIR Phase-0 program and on the analysis of data obtained in prior beamtimes. At HIM, the advancement of actinide sample preparation, manipulation, and characterization for various applications was most central. In addition, technical developments, for example for single-ion mass measurements, have been performed.

Published
2020

9. Research of the NUSTAR departments : SHE departments and HIM SHE section

Author

Leifels, Yvonne, Große, Katrin, Block, Michael, Düllmann, Christoph Emanuel, Andelic, B., Boehland, S., Chauveau, P., Chenmarev, S., Chhetri, P., Giacoppo, F., Götz, M., Götz, S., Haas, R., Heßberger, F. P., Kaleja, O., Khuyagbaatar, J., Kieck, T., Lohse, S., Meyer, C.-C., Mistry, A. K., Nothhelfer, S., Pershina, V., Raeder, Sebastian, Renisch, D., Rudolph, Dirk, Yakushev, Aleaxander, Leifels, Yvonne, Große, Katrin, Block, Michael, Düllmann, Christoph Emanuel, Andelic, B., Boehland, S., Chauveau, P., Chenmarev, S., Chhetri, P., Giacoppo, F., Götz, M., Götz, S., Haas, R., Heßberger, F. P., Kaleja, O., Khuyagbaatar, J., Kieck, T., Lohse, S., Meyer, C.-C., Mistry, A. K., Nothhelfer, S., Pershina, V., Raeder, Sebastian, Renisch, D., Rudolph, Dirk, and Yakushev, Aleaxander

Abstract

The SHE departments devoted to the research of superheavy elements, operate the recoil separators SHIP and TASCA and their ancillary installations including SHIPTRAP and a laser spectroscopy setup at SHIP as well as chemistry and nuclear spectroscopy setups at TASCA. In 2019, the activities at GSI focused on the UNILAC beamtime within the FAIR Phase-0 program and on the analysis of data obtained in prior beamtimes. At HIM, the advancement of actinide sample preparation, manipulation, and characterization for various applications was most central. In addition, technical developments, for example for single-ion mass measurements, have been performed.

Published
2020

10. Low-lying octupole isovector excitation in $^{144}$Nd

Author

Thürauf, M., Stoyanov, Ch., Scheck, M., Jentschel, M., Bernards, C., Blanc, A., Cooper, N., de France, G., Gregor, E.T., Henrich, C., Hicks, S.F., Jolie, J., Kaleja, O., Köster, U., Kröll, T., Leguillon, R., Mutti, P., O'Donnell, D., Petrache, C.M., Simpson, G.S., Smith, J.F., Soldner, T., Tezgel, M., Urban, W., Vanhoy, J., Werner, M., Werner, V., Zell, K.O., Zerrouki, T., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure
Abstract

International audience; The nature of low-lying 3− levels in Nd144 was investigated in the Nd143(n,γγ) cold neutron-capture reaction. The combination of the high neutron flux from the research reactor at the Institut Laue-Langevin and the high γ-ray detection efficiency of the EXILL setup allowed the recording of γγ coincidences. From the coincidence data precise branching ratios were extracted. Furthermore, the octagonal symmetry of the setup allowed angular-distribution measurements to determine multipole-mixing ratios. Additionally, in a second measurement the ultra-high resolution spectrometer GAMS6 was employed to conduct lifetime measurements using the gamma-ray induced Doppler-shift technique (GRID). The confirmed strong M1 component in the 33−→31− decay strongly supports the assignment of the 33− level at 2779keV as low-lying isovector octupole excitation. Microscopic calculations within the quasiparticle phonon model confirm an isovector component in the wave function of the 33− level, firmly establishing this fundamental mode of nuclear excitation in near-spherical nuclei.

Published
2019
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11. The 48Ca+181Ta reaction: Cross section studies and investigation of neutron-deficient 86 ≤ Z ≤ 93 isotopes

Author

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

Published
2019
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12. Low-lying octupole isovector excitation in Nd-144

Author

Thuerauf, M., Stoyanov, Ch, Scheck, M., Jentschel, M., Bernards, C., Blanc, A., Cooper, N., De France, G., Gregor, E. T., Henrich, C., Hicks, S. F., Jolie, J., Kaleja, O., Koster, U., Kroell, T., Leguillon, R., Mutti, P., Odonnell, D., Petrache, C. M., Simpson, G. S., Smith, J. F., Soldner, T., Tezgel, M., Urban, W., Vanhoy, J., Werner, M., Werner, V, Zell, K. O., Zerrouki, T., Thuerauf, M., Stoyanov, Ch, Scheck, M., Jentschel, M., Bernards, C., Blanc, A., Cooper, N., De France, G., Gregor, E. T., Henrich, C., Hicks, S. F., Jolie, J., Kaleja, O., Koster, U., Kroell, T., Leguillon, R., Mutti, P., Odonnell, D., Petrache, C. M., Simpson, G. S., Smith, J. F., Soldner, T., Tezgel, M., Urban, W., Vanhoy, J., Werner, M., Werner, V, Zell, K. O., and Zerrouki, T.

Abstract

The nature of low-lying 3(-) levels in Nd-144 was investigated in the Nd-143(n, gamma gamma) cold neutron-capture reaction. The combination of the high neutron flux from the research reactor at the Institut Laue-Langevin and the high gamma-ray detection efficiency of the EXILL setup allowed the recording of gamma gamma coincidences. From the coincidence data precise branching ratios were extracted. Furthermore, the octagonal symmetry of the setup allowed angular-distribution measurements to determine multipole-mixing ratios. Additionally, in a second measurement the ultra-high resolution spectrometer GAMS6 was employed to conduct lifetime measurements using the gamma-ray induced Doppler-shift technique (GRID). The confirmed strong M1 component in the 3(3)(-) -> 3(1)(-) decay strongly supports the assignment of the 3(3)(-) level at 2779 keV as low-lying isovector octupole excitation. Microscopic calculations within the quasiparticle phonon model confirm an isovector component in the wave function of the 3(3)(-) level, firmly establishing this fundamental mode of nuclear excitation in near-spherical nuclei.

Published
2019

13. Low-lying octupole isovector excitation in Nd144

Author

Thürauf, M., primary, Stoyanov, Ch., additional, Scheck, M., additional, Jentschel, M., additional, Bernards, C., additional, Blanc, A., additional, Cooper, N., additional, De France, G., additional, Gregor, E. T., additional, Henrich, C., additional, Hicks, S. F., additional, Jolie, J., additional, Kaleja, O., additional, Köster, U., additional, Kröll, T., additional, Leguillon, R., additional, Mutti, P., additional, O'Donnell, D., additional, Petrache, C. M., additional, Simpson, G. S., additional, Smith, J. F., additional, Soldner, T., additional, Tezgel, M., additional, Urban, W., additional, Vanhoy, J., additional, Werner, M., additional, Werner, V., additional, Zell, K. O., additional, and Zerrouki, T., additional

Published
2019
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14. Precision Measurement of the First Ionization Potential of Nobelium

Author

Chhetri, P., primary, Ackermann, D., additional, Backe, H., additional, Block, M., additional, Cheal, B., additional, Droese, C., additional, Düllmann, Ch. E., additional, Even, J., additional, Ferrer, R., additional, Giacoppo, F., additional, Götz, S., additional, Heßberger, F. P., additional, Huyse, M., additional, Kaleja, O., additional, Khuyagbaatar, J., additional, Kunz, P., additional, Laatiaoui, M., additional, Lautenschläger, F., additional, Lauth, W., additional, Lecesne, N., additional, Lens, L., additional, Minaya Ramirez, E., additional, Mistry, A. K., additional, Raeder, S., additional, Van Duppen, P., additional, Walther, Th., additional, Yakushev, A., additional, and Zhang, Z., additional

Published
2018
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15. Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy

Author

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

Published
2018
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17. Decay Spectroscopy of Heavy Isotopes at SHIP Using the COMPASS Focal Plane Detection Set-up

Author

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

Published
2018
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18. Recent upgrades of the SHIPTRAP setup : On the finish line towards direct mass spectroscopy of superheavy elements

Author

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

Abstract

With the Penning-trap mass spectrometer SHIPTRAP at GSI, Darmstadt, it is possible to investigate exotic nuclei in the region of the heaviest elements. Few years ago, challenging experiments led to the direct measurements of the masses of neutron-deficient isotopes with Z = 102; 103 around N = 152. Thanks to recent advances in cooling and ion-manipulation techniques, a major technical upgrade of the setup has been recently accomplished to boost its efficiency. At present, the gap to reach more rare and shorter-lived species at the limits of the nuclear landscape has been narrowed.

Published
2017

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

Author

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

Published
2017
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20. Identification of low-energy isovector octupole states in144Nd

Author

Thürauf, M, primary, Scheck, M, additional, Bernards, C, additional, Blanc, A, additional, Cooper, N, additional, Defrance, G, additional, Jentschel, M, additional, Jolie, J, additional, Kaleja, O, additional, Köster, U, additional, Kröll, T, additional, Mutti, P, additional, Simpson, G S, additional, Soldner, T, additional, Tezgel, M, additional, Urban, W, additional, Vanhoy, J, additional, Werner, M, additional, Werner, V, additional, and Zell, K O, additional

Published
2016
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21. Smooth trends in fermium charge radii and the impact of shell effects.

Author

Warbinek J, Rickert E, Raeder S, Albrecht-Schönzart T, Andelic B, Auler J, Bally B, Bender M, Berndt S, Block M, Brizard A, Chauveau P, Cheal B, Chhetri P, Claessens A, de Roubin A, Devlin C, Dorrer H, Düllmann CE, Ezold J, Ferrer R, Gadelshin V, Gaiser A, Giacoppo F, Goriely S, Gutiérrez MJ, Harvey A, Hasse R, Heinke R, Heßberger FP, Hilaire S, Kaja M, Kaleja O, Kieck T, Kim E, Kneip N, Köster U, Kraemer S, Laatiaoui M, Lantis J, Lecesne N, Loria Basto AT, Mistry AK, Mokry C, Moore I, Murböck T, Münzberg D, Nazarewicz W, Niemeyer T, Nothhelfer S, Péru S, Raggio A, Reinhard PG, Renisch D, Rey-Herme E, Romans J, Romero Romero E, Runke J, Ryssens W, Savajols H, Schneider F, Sperling J, Stemmler M, Studer D, Thörle-Pospiech P, Trautmann N, Urquiza-González M, van Beek K, Van Cleve S, Van Duppen P, Vandebrouck M, Verstraelen E, Walther T, Weber F, and Wendt K

Abstract

The quantum-mechanical nuclear-shell structure determines the stability and limits of the existence of the heaviest nuclides with large proton numbers Z ≳ 100 (refs. 1-3 ). Shell effects also affect the sizes and shapes of atomic nuclei, as shown by laser spectroscopy studies in lighter nuclides 4 . However, experimental information on the charge radii and the nuclear moments of the heavy actinide elements, which link the heaviest naturally abundant nuclides with artificially produced superheavy elements, is sparse 5 . Here we present laser spectroscopy measurements along the fermium (Z = 100) isotopic chain and an extension of data in the nobelium isotopic chain (Z = 102) across a key region. Multiple production schemes and different advanced techniques were applied to determine the isotope shifts in atomic transitions, from which changes in the nuclear mean-square charge radii were extracted. A range of nuclear models based on energy density functionals reproduce well the observed smooth evolution of the nuclear size. Both the remarkable consistency of model prediction and the similarity of predictions for different isotopes suggest a transition to a regime in which shell effects have a diminished effect on the size compared with lighter nuclei., (© 2024. The Author(s).)

Published
2024
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22. Atom-at-a-time laser resonance ionization spectroscopy of nobelium.

Author

Laatiaoui M, Lauth W, Backe H, Block M, Ackermann D, Cheal B, Chhetri P, Düllmann CE, van Duppen P, Even J, Ferrer R, Giacoppo F, Götz S, Heßberger FP, Huyse M, Kaleja O, Khuyagbaatar J, Kunz P, Lautenschläger F, Mistry AK, Raeder S, Ramirez EM, Walther T, Wraith C, and Yakushev A

Abstract

Optical spectroscopy of a primordial isotope has traditionally formed the basis for understanding the atomic structure of an element. Such studies have been conducted for most elements and theoretical modelling can be performed to high precision, taking into account relativistic effects that scale approximately as the square of the atomic number. However, for the transfermium elements (those with atomic numbers greater than 100), the atomic structure is experimentally unknown. These radioactive elements are produced in nuclear fusion reactions at rates of only a few atoms per second at most and must be studied immediately following their production, which has so far precluded their optical spectroscopy. Here we report laser resonance ionization spectroscopy of nobelium (No; atomic number 102) in single-atom-at-a-time quantities, in which we identify the ground-state transition 1 S 0 1 P 1 . By combining this result with data from an observed Rydberg series, we obtain an upper limit for the ionization potential of nobelium. These accurate results from direct laser excitations of outer-shell electrons cannot be achieved using state-of-the-art relativistic many-body calculations that include quantum electrodynamic effects, owing to large uncertainties in the modelled transition energies of the complex systems under consideration. Our work opens the door to high-precision measurements of various atomic and nuclear properties of elements heavier than nobelium, and motivates future theoretical work.

Published
2016
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