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1.
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High-resolution laser spectroscopy of singly charged natural uranium isotopes
/ Raggio, Andrea (Jyvaskyla U.) ; Block, Michael (Darmstadt, GSI ; Mainz U., Inst. Phys. ; Helmholtz Inst., Mainz) ; Campbell, Paul (Manchester U.) ; Cheal, Bradley (Liverpool U.) ; deGroote, Ruben P (Jyvaskyla U. ; KU Leuven, Dept. Phys. Astron.) ; Gins, Wouter (Jyvaskyla U.) ; Koszorús, Ágota (Liverpool U. ; KU Leuven, Dept. Phys. Astron.) ; Moore, Iain D (Jyvaskyla U.) ; Ortiz-Cortes, Alejandro (Jyvaskyla U. ; GANIL ; Michigan State U., East Lansing (main)) ; Pohjalainen, Ilkka (Jyvaskyla U.) et al.
High-resolution collinear laser spectroscopy has been performed on singly charged ions of $^{234,235,238}$U at the IGISOL facility of the Accelerator Laboratory, University of Jyväskylä, in Finland. Ten ionic transitions from the $^{4}\hbox {I}_{9/2}$ and $^{6}\hbox {L}_{11/2}$ ground and first excited states were measured in the 300 nm wavelength range, improving the precision of the hyperfine parameters of the lower states in addition to providing newly measured values for the upper levels. [...]
2024 - 9 p.
- Published in : Sci. Rep. 14 (2024) 25621
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Smooth trends in fermium charge radii and the impact of shell effects
/ Warbinek, Jessica (Darmstadt, GSI ; Mainz U. ; CERN ; Helmholtz Inst., Mainz) ; Rickert, Elisabeth (Darmstadt, GSI ; Mainz U. ; Helmholtz Inst., Mainz) ; Raeder, Sebastian (Darmstadt, GSI ; Helmholtz Inst., Mainz) ; Albrecht-Schönzart, Thomas (Colorado School of Mines) ; Andelic, Brankica (Darmstadt, GSI ; Helmholtz Inst., Mainz ; Groningen U.) ; Auler, Julian (Mainz U.) ; Bally, Benjamin (IRFU, Saclay) ; Bender, Michael (IP2I, Lyon) ; Berndt, Sebastian (Mainz U.) ; Block, Michael (Darmstadt, GSI ; Mainz U. ; Helmholtz Inst., Mainz) et al.
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. $^{1–3}$). [...]
2024 - 5 p.
- Published in : Nature 634 (2024) 1075-1079
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3.
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Spectroscopy of $^{187}$Tl: shape coexistence
/ Guo, C Y (Peking U., SKLNPT) ; Zhang, W Q (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Huang, H (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhang, S Q (Peking U., SKLNPT) ; Li, Z H (Peking U., SKLNPT) ; Liu, Z (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Hua, H (Peking U., SKLNPT) ; Luo, D W (Peking U., SKLNPT) ; Wu, H Y (Peking U., SKLNPT ; Beijing, Inst. Atomic Energy) ; Andreyev, A N (York U., England ; Jefferson Lab ; JAEA, Ibaraki) et al.
The prompt and delayed $\gamma $-ray spectra of $^{187}$Tl was studied via the $^{142}$Nd($^{50}$Cr, 3p2n)$^{187}$Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of $^{187}$Tl was established. [...]
2024 - 10 p.
- Published in : Eur. Phys. J. A 60 (2024) 165
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4.
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RAPTOR: A new collinear laser ionization spectroscopy and laser-radiofrequency double-resonance experiment at the IGISOL facility
/ Kujanpää, S. (Jyvaskyla U.) ; Raggio, A. (Jyvaskyla U.) ; de Groote, R.P. (Jyvaskyla U. ; Leuven U.) ; Athanasakis-Kaklamanakis, M. (Leuven U. ; CERN) ; Block, M. (Darmstadt, GSI ; Mainz U., Inst. Phys. ; Helmholtz Inst., Mainz) ; Candiello, A. (Leuven U.) ; Gins, W. (Jyvaskyla U.) ; Koszorús, Á. (Liverpool U.) ; Moore, I.D. (Jyvaskyla U.) ; Reponen, M. (Jyvaskyla U.) et al.
RAPTOR, Resonance ionization spectroscopy And Purification Traps for Optimized spectRoscopy, is a new collinear resonance ionization spectroscopy device constructed at the Ion Guide Isotope Separator On-Line (IGISOL) facility at the University of Jyväskylä, Finland. By operating at beam energies of under 10 keV, the footprint of the experiment is reduced compared to more traditional collinear laser spectroscopy beamlines. [...]
arXiv:2302.14637.-
2023-06-06 - 4 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 541 (2023) 388-391
Fulltext: 2302.14637 - PDF; Publication - PDF;
In : 19th International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2022), Daejeon, Korea, 3 - 7 Oct 2022, pp.388-391
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5.
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Nuclear moments and isotope shifts of the actinide isotopes Cf249–253 probed by laser spectroscopy
/ Weber, Felix (Mainz U., Inst. Phys.) ; Albrecht-Schönzart, Thomas E (Florida State U.) ; Allehabi, Saleh O (New South Wales U.) ; Berndt, Sebastian (Mainz U., Inst. Phys. ; Mainz U.) ; Block, Michael (Darmstadt, GSI ; Mainz U. ; Helmholtz Inst., Mainz) ; Dorrer, Holger (Mainz U.) ; Düllmann, Christoph E (Darmstadt, GSI ; Mainz U. ; Helmholtz Inst., Mainz) ; Dzuba, Vladimir A (New South Wales U.) ; Ezold, Julie G (Oak Ridge) ; Flambaum, Victor V (New South Wales U.) et al.
We report on high-resolution laser spectroscopy studies on Cf249–253 with spectral linewidths in the order of 100 MHz carried out at the RISIKO mass separator at Mainz University. In total three atomic ground-state transitions were investigated and the hyperfine parameters for the odd-A isotopes and isotope shift for all examined isotopes have been determined from the measured spectra. [...]
2023 - 10 p.
- Published in : Phys. Rev. C 107 (2023) 034313
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6.
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High-precision measurements of the hyperfine structure of cobalt ions in the deep ultraviolet range
/ Koszorús, Á (Liverpool U. ; CERN) ; Block, M (Darmstadt, GSI ; Helmholtz Inst., Mainz ; Mainz U., Inst. Phys.) ; Campbell, P (Manchester U.) ; Cheal, B (Liverpool U.) ; de Groote, R P (Jyvaskyla U. ; KU Leuven, Dept. Phys. Astron.) ; Gins, W (Jyvaskyla U.) ; Moore, I D (Jyvaskyla U.) ; Ortiz‑Cortes, A (Jyvaskyla U. ; GANIL) ; Raggio, A (Jyvaskyla U.) ; Warbinek, J (Darmstadt, GSI)
High-precision hyperfine structure measurements were performed on stable, singly-charged $^{59}$Co ions at the IGISOL facility in Jyväskylä, Finland using the collinear laser spectroscopy technique. A newly installed light collection setup enabled the study of transitions in the 230 nm wavelength range from low-lying states below 6000 cm$^{-1}$. [...]
2023 - 7 p.
- Published in : Sci. Rep. 13 (2023) 4783
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7.
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First observation of the decay of the 13/24$^+$ isomer in $^{183}$Hg and B(M2) systematics of neutron transitions across the nuclear chart
/ Huang, H (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhang, W Q (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Andreyev, A N (York U., England, Dept. Math. ; JAEA, Ibaraki) ; Liu, Z (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Seweryniak, D (Argonne, PHY) ; Li, Z H (Peking U., SKLNPT) ; Guo, C Y (Peking U., SKLNPT) ; Barzakh, A E (St. Petersburg, INP) ; Van Duppen, P (KU Leuven, Dept. Phys. Astron.) ; Andel, B (Comenius U.) et al.
The decay of the 13/2$^+$ isomeric state in $^{183}$Hg was observed for the first time following the $\alpha$ decay of the 13/2$^+$ isomer in $^{187}$Pb produced in the $^{142}$Nd($^{50}$Cr, 2p3n) reaction. Using $\alpha - \gamma$ delayed coincidence measurements, the half-life of this isomer was measured to be 290(30) μs. [...]
2022 - 8 p.
- Published in : Phys. Lett. B 833 (2022) 137345
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First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic $^{187}$Pb
/ Zhang, W Q (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Liu, Z (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Seweryniak, D (Argonne, PHY) ; Huang, H (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Li, Z H (Peking U., SKLNPT) ; Li, J G (Lanzhou, Inst. Modern Phys. ; Peking U., SKLNPT) ; Guo, C Y (Peking U., SKLNPT) ; Doherty, D T (Surrey U.) ; Barzakh, A E (St. Petersburg, INP) et al.
Prompt and delayed γ-ray spectroscopy of the neutron-deficient, semi-magic isotope 187Pb has been performed using the recoil-decay and isomer-decay tagging techniques at the Argonne Gas-Filled Analyzer. A new 5.15(15)-μs isomeric state at only 308 keV above the spherical 3/2− ground state is identified and classified as a shape isomer. [...]
2022 - 7 p.
- Published in : Phys. Lett. B 829 (2022) 137129
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9.
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Study of the radiative decay of the low-energy isomer in $^{229}$Th
/ Chhetri, Premaditya (KU Leuven) ; Bara, Silvia (KU Leuven) ; Beeks, Kjeld (TU Wein) ; Bernerd, Cyril (KU Leuven, CERN) ; Block, Michael (GSI Darmstadt, HIM Mainz, University of Mainz) ; Claessens, Arno (KU Leuven) ; Cocolios, Thomas Elias (KU Leuven) ; Martins Correia, João Guilherme (Universidade de Lisboa) ; Granadeiro Costa, Angelo Rafael (KU Leuven) ; Cottenier, Stefaan (Ghent University) et al.
CERN-INTC-2022-017 ; INTC-P-628.
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2022.
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10.
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Study of the radiative decay of the low-energy isomer in ${}^{229}$Th
/ Kraemer, Sandro (Institute for Nuclear and Radiation Physics, KU Leuven, Belgium) ; Beeks, Kjeld (Institute of Atomic and Subatomic Physics, Vienna University of Technology, Austria) ; Block, Michael (GSI Helmholtzzentrum für Schwerionenforschung, Germany) ; Cocolios, Thomas (Institute for Nuclear and Radiation Physics, KU Leuven, Belgium) ; Correia, Guilherme (ISOLDE-CERN, Switzerland) ; Cottenier, Stefaan (Center for Molecular Modelling, Ghent University, Belgium) ; De Witte, Hilde (Institute for Nuclear and Radiation Physics, KU Leuven, Belgium) ; Dockx, Kristof (Institute for Nuclear and Radiation Physics, KU Leuven, Belgium) ; Ferrer, Rafael (Institute for Nuclear and Radiation Physics, KU Leuven, Belgium) ; Geldhof, Sarina (Department of Physics, University of Jyväskylä, Finland) et al.
CERN-INTC-2020-020 ; INTC-P-548.
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2020.
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