CERN Accelerating science

ISOLDE Papers

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2022-06-18
04:09
A concept for the extraction of the most refractory elements at CERN-ISOLDE as carbonyl complex ions / Ballof, J. (CERN ; Mainz U.) ; Chrysalidis, K. (CERN ; Mainz U., Inst. Phys.) ; Düllmann, Ch. E. (Mainz U. ; Darmstadt, GSI ; Helmholtz Inst., Mainz) ; Fedosseev, V. (CERN) ; Granados, E. (CERN) ; Leimbach, D. (CERN ; Mainz U., Inst. Phys.) ; Marsh, B.A. (CERN) ; Ramos, J.P. (CERN ; Ecole Polytechnique, Lausanne ; SCK-CEN, Mol) ; Ringvall-Moberg, A. (CERN ; U. Gothenburg (main)) ; Rothe, S. (CERN) et al.
We introduce a novel thick-target concept tailored to the extraction of refractory 4d and 5d transition metal radionuclides of molybdenum, technetium, ruthenium and tungsten for radioactive ion beam production. Despite the more than 60-year old history of thick-target ISOL mass-separation facilities like ISOLDE, the extraction of the most refractory elements as radioactive ion beam has so far not been successful. [...]
arXiv:2108.01745.- 2022-05-17 - 18 p. - Published in : Eur. Phys. J. A Fulltext: 2108.01745 - PDF; document - PDF;

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2022-06-04
06:06
Spectral synthesis of multimode lasers to the Fourier limit in integrated Fabry–Perot diamond resonators / Granados, Eduardo (CERN) ; Granados, Camilo ; Ahmed, Rizwan (CERN) ; Chrysalidis, Katerina (CERN) ; Fedosseev, Valentin N (CERN) ; Marsh, Bruce A (CERN) ; Wilkins, Shane G (CERN) ; Mildren, Richard P (Macquarie U.) ; Spence, David J (Macquarie U.)
Fourier-limited nanosecond pulses featuring narrow spectral bandwidths are required for applications in spectroscopy, sensing, and quantum optics. Here, we demonstrate a direct and simple route for the generation of single-frequency light relying on phonon-resonant Raman interactions within a monolithic diamond resonator. [...]
2022 - 8 p. - Published in : Optica 9 (2022) 317-324

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2022-06-02
06:30
Tunable spectral squeezers based on monolithically integrated diamond Raman resonators / Granados, E (CERN) ; Stoikos, G (CERN) ; Echarri, D T (CERN ; Navarra U.) ; Chrysalidis, K (CERN) ; Fedosseev, V N (CERN) ; Granados, C (Max Born Inst., Berlin) ; Leask, V (CERN ; Strathclyde U.) ; Marsh, B A (CERN) ; Mildren, R P (Macquarie U.)
We report on the generation and tuning of single-frequency laser light in a monolithic Fabry–Pérot diamond Raman resonator operating in the visible spectral range. The device was capable of squeezing the linewidth of a broad multi-mode nanosecond pump laser ([Formula: see text] 7.2 ± 0.9 GHz at [Formula: see text] 450 nm) to a nearly Fourier-limited single axial mode Stokes pulse ([Formula: see text] 114 ± 20 MHz at [Formula: see text] 479 nm) [...]
2022 - 7 p. - Published in : Appl. Phys. Lett. 120 (2022) 151101 Fulltext: PDF;

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2022-05-27
17:44
Direct evidence of Be as an amphoteric dopant in GaN / Wahl, U. ; Correia, J. G. ; Costa, A. R. G. ; Lima, T. A. L. ; Moens, J. ; Kappers, M. J. ; da Silva, M. R. ; Pereira, L. M. C. ; Vantomme, A. /IS634 Collaboration
The interest in Be as an impurity in GaN stems from the challenge to understand why GaN can be doped p type with Mg, while this does not work for Be. While theory has actually predicted an acceptor level for Be that is shallower than Mg, it was also argued that Be is not a suitable acceptor because its am-photeric nature, i.e. [...]
- Published in : Physical Review B105 (2022) 184112 Postprint from Phys. Rev. B 105 (2022) 184112: PDF; Supplemental Material from Phys. Rev. B 105 (2022) 184114: PDF;

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2022-05-06
06:24
Yttrium Oxide Freeze-Casts: Target Materials for Radioactive Ion Beams / Kröll, Eva (U. Duisburg-Essen) ; Vadalà, Miriana (U. Duisburg-Essen) ; Schell, Juliana (U. Duisburg-Essen ; CERN) ; Stegemann, Simon (CERN) ; Ballof, Jochen (CERN) ; Rothe, Sebastian (CERN) ; Lupascu, Doru C (U. Duisburg-Essen)
Highly porous yttrium oxide is fabricated as ion beam target material in order to produce radioactive ion beams via the Isotope Separation On Line (ISOL) method. Freeze casting allows the formation of an aligned pore structure in these target materials to improve the isotope release. Aqueous suspensions containing a solid loading of 10, 15, and 20 vol% were solidified with a unidirectional freeze-casting setup. [...]
2021 - 12 p. - Published in : Materials 14 (2021) 2864

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2022-04-06
06:08
Decay modes of the $9/2^-$ isomeric state in $^{183}$Tl / Venhart, M (Bratislava, Inst. Phys.) ; Andreyev, A N (JAERI, Tokai ; York U., England) ; Cubiss, J G (York U., England) ; Wood, J L (Georgia Tech., Atlanta) ; Barzakh, A E (St. Petersburg, INP) ; Van Beveren, C (Leuven U.) ; Cocolios, T E (Leuven U.) ; de Groote, R P (Leuven U.) ; Fedorov, D V (St. Petersburg, INP) ; Fedosseev, V N (CERN) et al.
The internal transition decay and α decay of the $T_{1/2} = 53.3$ ms, $9/2^-$ isomeric state in the neutron-deficient isotope, $^{183}$Tl, have been studied using the Resonance Ionization Laser Ion Source and the Windmill detection setup at the ISOLDE facility at CERN. Clean samples of $^{183}$Tl were produced by selective laser ionization and subsequent mass separation. [...]
2022 - 9 p. - Published in : Phys. Rev. C 105 (2022) 034338 Fulltext: PDF;

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2022-02-15
06:02
Radio-frequency waveform investigation for ion transport within the RFQcb at ISOLDE's Offline 2 facility / Warren, S (CERN) ; Giles, T (CERN)
A theoretical and practical investigation into the relation of applied waveform, voltage, and frequency of the quadrupole potential applied to the Radio-Frequency Quadrupole cooler and buncher (RFQcb) used at the ISOLDE facility and the Offline 2 facility. Non-radioactive ion beams were transported through the RFQcb over a range of quadrupole parameters to quantify beam transport efficiency via pre and post beam current measurements. [...]
2021 - 18 p. - Published in : JINST 16 (2021) P07058 Fulltext: PDF;

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2022-01-13
06:16
Producing gold at ISOLDE-CERN / Barzakh, A E (St. Petersburg, INP) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Cubiss, J G (York U., England) ; Harding, R D (York U., England ; CERN) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U.) ; Andel, B (Comenius U. ; Leuven U.) ; Antalic, S (Comenius U.) ; Ballof, J (CERN ; Mainz U., Inst. Kernchem.) et al.
The yield of 18 ion beams of radioactive gold nuclei produced in the thick uranium target at ISOLDE (CERN) by 1.4-GeV protons was measured. The production-efficiency dependence on the half-life (efficiency curve) was derived using the in-target production calculations by the FLUKA-CERN code. [...]
2022 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 513 (2022) 26-32

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2022-01-11
06:26
A miniaturized low-power SiPM-based β detector for the ISOLDE Fast Tapestation / Neacşu, Cătălin (Bucharest, Polytechnic Inst. ; Bucharest, IFIN-HH) ; Lică, Răzvan (CERN ; Bucharest, IFIN-HH) ; Pascovici, George (Bucharest, IFIN-HH) ; Mihai, Constantin (Bucharest, IFIN-HH) ; Rothe, Sebastian (CERN)
We report on the development of a miniaturized Silicon Photomultiplier (SiPM)-based β detector aimed as an upgrade of the newly commissioned Fast Tapestation at CERN-ISOLDE, dedicated for online radioisotope production measurements. The detector consists of a thin 3 mm plastic scintillator coupled to a custom 3 × 3 array of 6×6mm2 sized SiPM cells in a signal-driven multiplexer configuration. [...]
2022 - Published in : Nucl. Instrum. Methods Phys. Res., A 1026 (2022) 166213

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2021-11-18
04:59
Study of radial motion phase advance during motion excitations in a Penning trap and accuracy of JYFLTRAP mass spectrometer / Nesterenko, D.A. (Jyvaskyla U.) ; Eronen, T. (Jyvaskyla U.) ; Ge, Z. (Jyvaskyla U.) ; Kankainen, A. (Jyvaskyla U.) ; Vilen, M. (Jyvaskyla U. ; CERN)
Phase-imaging ion-cyclotron-resonance technique has been implemented at the Penning-trap mass spectrometer JYFLTRAP and is routinely employed for mass measurements of stable and short-lived nuclides produced at IGISOL facility. Systematic uncertainties that impose limitations on the accuracy of measurements are discussed. [...]
arXiv:2107.05631.- 2021-11-01 - 19 p. - Published in : Eur. Phys. J. A 57 (2021) 302 Fulltext: 2107.05631 - PDF; document - PDF;

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