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1.
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First on-line application of the high-resolution spectroscopy laser ion source PI-LIST at ISOLDE
/ Heinke, Reinhard (CERN) ; Au, Mia (CERN ; Mainz U.) ; Bernerd, Cyril (CERN ; Leuven U.) ; Chrysalidis, Katerina (CERN) ; Cocolios, Thomas E (Leuven U.) ; Fedosseev, Valentin N (CERN) ; Hendriks, Isabel (CERN ; Lund U. (main)) ; Jaradat, Asar A H (CERN) ; Kaja, Magdalena (Mainz U., Inst. Phys.) ; Kieck, Tom (Darmstadt, GSI ; Helmholtz Inst., Mainz) et al.
We report on the development, characterization, and first application of a specialized resonance ionization laser ion source for high-resolution spectroscopy applications below usual hot cavity Doppler broadening limitations, for on-line experiments at CERN-ISOLDE. The new PI-LIST ion source comprises perpendicular laser/atom beam interaction in a radio-frequency quadrupole unit directly downstream the hot atomizer cavity. [...]
2023 - 5 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 541 (2023) 8-12
Fulltext: PDF;
In : 19th International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2022), Daejeon, Korea, 3 - 7 Oct 2022, pp.8-12
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2.
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Measurement of the laser resonance ionization efficiency for lutetium
/ Gadelshin, Vadim Maratovich (Mainz U. ; Ekaterinburg, Inst. Metal Phys.) ; Heinke, Reinhard (Mainz U., Inst. Phys.) ; Kieck, Tom (Mainz U., Inst. Phys.) ; Kron, Tobias (Mainz U., Inst. Phys.) ; Naubereit, Pascal (Mainz U., Inst. Phys.) ; Rösch, Frank (Mainz U., Inst. Phys.) ; Stora, Thierry (CERN) ; Studer, Dominik (Mainz U., Inst. Phys.) ; Wendt, Klaus (Mainz U., Inst. Phys.)
The development of a highly efficient resonance ionization scheme for lutetium is presented. A laser ion source, based on the all-solid-state Titanium:sapphire laser system, was used at the 30 keV RISIKO off-line mass separator to characterize different possible optical excitation schemes in respect to their ionization efficiency. [...]
2019 - 9 p.
- Published in : Radiochim. Acta 107 (2019) 653-661
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3.
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Atom beam emersion from hot cavity laser ion sources
/ Heinke, R (Mainz U.) ; Fedosseev, V (CERN) ; Kieck, T (Mainz U.) ; Kron, T (Mainz U. ; Helmholtz Inst., Mainz) ; Marsh, B (CERN) ; Raeder, S (Helmholtz Inst., Mainz ; Darmstadt, GSI) ; Richter, S (Mainz U.) ; Rothe, S (CERN) ; Wendt, K (Mainz U.)
Ion sources exploiting laser resonance ionization offer efficient and element-selective radioactive ion beam production at the leading isotope separation on-line facilities worldwide. Most commonly, laser resonance ionization takes place inside a resistively heated atomizer tube directly coupled to the production target, where the element of interest is evaporated and provided as atomic vapor. [...]
2020 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 463 (2020) 449-454
In : 18th International Conference on Electromagnetic Isotope Separators and Related Topics, Geneva, Switzerland, 16 - 21 Sep 2018, pp.449-454
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4.
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In-gas laser ionization and spectroscopy of actinium isotopes near the $N=126$ closed shell
/ Granados, C (Leuven U.) ; Creemers, P (Leuven U.) ; Ferrer, R (Leuven U.) ; Gaffney, L P (Leuven U.) ; Gins, W (Leuven U.) ; de Groote, R (Leuven U.) ; Huyse, M (Leuven U.) ; Kudryavtsev, Yu (Leuven U.) ; Martinez, Y (Leuven U.) ; Raeder, S (Leuven U.) et al.
The in-gas laser ionization and spectroscopy (IGLIS) technique was applied on the Ac212–215 isotopes, produced at the Leuven Isotope Separator On-Line (LISOL) facility by using the in-gas-cell and the in-gas-jet methods. The first application under on-line conditions of the in-gas-jet laser spectroscopy method showed a superior performance in terms of selectivity, spectral resolution, and efficiency in comparison with the in-gas-cell method. [...]
2017 - 13 p.
- Published in : Phys. Rev. C 96 (2017) 054331
Fulltext: PDF;
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5.
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Laser photodetachment of radioactive $^{128}$I$^−$
/ Rothe, Sebastian (CERN) ; Sundberg, Julia (CERN ; U. Gothenburg) ; Welander, Jakob (U. Gothenburg) ; Chrysalidis, Katerina (CERN ; Mainz U., Inst. Phys.) ; Goodacre, Thomas Day (CERN) ; Fedosseev, Valentin (CERN) ; Fiotakis, Spyridon (CERN) ; Forstner, Oliver (U. Jena) ; Heinke, Reinhard (Mainz U., Inst. Phys.) ; Johnston, Karl (CERN) et al.
The first experimental investigation of the electron affinity (EA) of a radioactive isotope has been conducted at the CERN-ISOLDE radioactive ion beam facility. The EA of the radioactive iodine isotope (128)I (t (1/2) = 25 min) was determined to be 3.059 052(38) eV. [...]
2017 - 10 p.
- Published in : J. Phys. G 44 (2017) 104003
Fulltext: PDF;
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6.
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Towards high-resolution laser ionization spectroscopy of the heaviest elements in supersonic gas jet expansion
/ Ferrer, R (KU Leuven, Dept. Phys. Astron.) ; Barzakh, A (St. Petersburg, INP) ; Bastin, B (GANIL) ; Beerwerth, R (Helmholtz Inst., Jena ; Jena U., TPI) ; Block, M (Darmstadt, GSI ; Helmholtz Inst., Mainz ; Mainz U., Inst. Kernchem.) ; Creemers, P (KU Leuven, Dept. Phys. Astron.) ; Grawe, H (Darmstadt, GSI) ; de Groote, R (KU Leuven, Dept. Phys. Astron.) ; Delahaye, P (GANIL) ; Fléchard, X (Caen U.) et al.
Resonant laser ionization and spectroscopy are widely used techniques at radioactive ion
beam facilities to produce pure beams of exotic nuclei and measure the shape, size, spin and
electromagnetic multipole moments of these nuclei. However, in such measurements it is
difficult to combine a high efficiency with a high spectral resolution. [...]
2017 - 9 p.
- Published in : Nature Commun. 8 (2017) 14520
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7.
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Developments towards in-gas-jet laser spectroscopy studies of actinium isotopes at LISOL
/ Raeder, S (KU Leuven, Dept. Phys. Astron.) ; Bastin, B (GANIL) ; Block, M (Helmholtz-Institut Mainz) ; Creemers, P (KU Leuven, Dept. Phys. Astron.) ; Delahaye, P (GANIL) ; Ferrer, R (KU Leuven, Dept. Phys. Astron.) ; Fléchard, X (Caen U.) ; Franchoo, S (Orsay, IPN) ; Ghys, L (KU Leuven, Dept. Phys. Astron.) ; Gaffney, L P (KU Leuven, Dept. Phys. Astron.) et al.
To study exotic nuclides at the borders of stability with laser ionization and spectroscopy techniques, highest efficiencies in combination with a high spectral resolution are required. These usually opposing requirements are reconciled by applying the in-gas-laser ionization and spectroscopy (IGLIS) technique in the supersonic gas jet produced by a de Laval nozzle installed at the exit of the stopping gas cell. [...]
2016 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 376 (2016) 382-387
In : 17th International Conference on Electromagnetic Isotope Separators and Related Topics, Grand Rapids, USA, 11 - 15 May 2015, pp.382-387
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8.
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Laser photodetachment of radioactive ions: towards the determination of the electronegativity of astatine
Reference: Poster-2017-585
Created: 2017. -1 p
Creator(s): Rothe, Sebastian; Sundberg, Julia; Welander, Jakob Emanuel; Chrysalidis, Katerina; Day Goodacre, Thomas [...]
Negatively charged ions are mainly stabilized through the electron correlation effect. A measure of the stability of a negative ion is the electron affinity, which the energy gain by attaching an electron to a neutral atom. This fundamental quantity is, due to the almost general lack of bound excited states, the only atomic property that can be determined with high accuracy for negative ions. We will present the results of the first laser photodetachment studies of radioactive negative ions at CERN-ISOLDE. The photodetachment threshold for the radiogenic iodine isotope 128I was measured successfully, demonstrating the performance of the upgraded GANDALPH experimental beam line. The first detection of photo-detached astatine atoms marks a milestone towards the determination of the EA of this radioactive element.
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© CERN Geneva
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9.
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Resonance ionization scheme development for europium
/ Chrysalidis, K (CERN ; Mainz U., Inst. Phys.) ; Day Goodacre, T (CERN) ; Fedosseev, V N (CERN) ; Marsh, B A (CERN) ; Naubereit, P (Mainz U., Inst. Phys.) ; Rothe, S (CERN) ; Seiffert, C (CERN) ; Kron, T (Mainz U., Inst. Phys.) ; Wendt, K (Mainz U., Inst. Phys.)
Odd-parity autoionizing states of europium have been investigated by resonance ionization spectroscopy via two-step, two-resonance excitations. The aim of this work was to establish ionization schemes specifically suited for europium ion beam production using the ISOLDE Resonance Ionization Laser Ion Source (RILIS). [...]
Geneva : CERN, 2017 - 10 p.
- Published in : Hyperfine Interact. 238 (2017) 34
Preprint: PDF;
In : 10th International Workshop on Application of Lasers and Storage Devices in Atomic Nuclei Research : Recent Achievements and Future Prospects, Poznan, Poland, 16 - 19 May 2016, pp.34
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10.
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High-resolution laser spectroscopy with the Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at CERN-ISOLDE
/ Cocolios, T E (Manchester U.) ; de Groote, R P (Leuven U.) ; Billowes, J (Manchester U.) ; Bissell, M L (Manchester U. ; Leuven U.) ; Budinčević, I (Leuven U.) ; Day Goodacre, T (Manchester U. ; CERN) ; Farooq-Smith, G J (Manchester U.) ; Fedosseev, V N (CERN) ; Flanagan, K T (Manchester U.) ; Franchoo, S (Orsay, IPN) et al.
The Collinear Resonance Ionisation Spectroscopy (CRIS) experiment at CERN has achieved high-resolution resonance ionisation laser spectroscopy with a full width at half maximum linewidth of 20(1) MHz for 219,221 Fr, and has measured isotopes as short lived as 5 ms with 214 Fr. This development allows for greater precision in the study of hyperfine structures and isotope shifts, as well as a higher selectivity of single-isotope, even single-isomer, beams. [...]
2016 - 4 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 376 (2016) 284-287
Elsevier Open Access article: PDF;
In : 17th International Conference on Electromagnetic Isotope Separators and Related Topics, Grand Rapids, USA, 11 - 15 May 2015, pp.284-287
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