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In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties of $^{217,219}$Po
/ Fink, D A (CERN ; Heidelberg, Max Planck Inst. ; Heidelberg U.) ; Cocolios, T. E. (CERN ; Manchester U.) ; Andreyev, A. N. (York U., England ; JAEA, Ibaraki) ; Antalic, S. (Comenius U. ; Comenius U. ; Comenius U.) ; Barzakh, A. E. (St. Petersburg, INP) ; Bastin, B. (GANIL) ; Fedorov, D. V. (St. Petersburg, INP) ; Fedosseev, V. N. (CERN) ; Flanagan, K. T. (Manchester U. ; Manchester U. ; Manchester U.) ; Ghys, L. (Leuven U. ; Leuven U. ; SCK-CEN, Mol ; Leuven U. ; SCK-CEN, Mol ; SCK-CEN, Mol) et al.
A Laser Ion Source and Trap (LIST) for a thick-target, isotope-separation on-line facility has been implemented at CERN ISOLDE for the production of pure, laser-ionized, radioactive ion beams. It offers two modes of operation, either as an ion guide, which performs similarly to the standard ISOLDE resonance ionization laser ion source (RILIS), or as a more selective ion source, where surface-ionized ions from the hot ion-source cavity are repelled by an electrode, while laser ionization is done within a radio-frequency quadrupole ion guide. [...]
2015 - 15 p.
- Published in : Phys. Rev. X 5 (2015) 011018
APS Open Access article: PDF;
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2.
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Quadrupole Moments of $^{29}$Mg and $^{33}$Mg
/ Yordanov, Deyan Todorov (Orsay, IPN ; Heidelberg, Max Planck Inst. ; CERN) ; Kowalska, Magdalena (CERN) ; Blaum, Klaus (Heidelberg, Max Planck Inst.) ; De Rydt, Marieke (Leuven U.) ; Flanagan, Kieran T. (Manchester U. ; Leuven U.) ; Himpe, Pieter (Leuven U.) ; Lievens, Peter (Leuven U.) ; Mallion, Stephen (Leuven U.) ; Neugart, Rainer (Heidelberg, Max Planck Inst. ; Mainz U., Inst. Kernchem.) ; Neyens, Gerda (Leuven U.) et al.
The quadrupole moments of 29Mg and 33Mg have been constrained by collinear laser spectroscopy at CERN-ISOLDE. The values are consistent with shell-model predictions, thus supporting the current understanding of light nuclei associated with the "island of inversion"..
arXiv:1905.05580.-
2019-06-12 - 4 p.
- Published in : Hyperfine Interact. 240 (2019) 67
Fulltext: PDF;
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3.
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Laser spectroscopy of neutron-rich $^{207,208}$Hg isotopes: Illuminating the kink and odd-even staggering in charge radii across the $N=126$ shell closure
/ Day Goodacre, T. (Manchester U. ; CERN ; TRIUMF) ; Afanasjev, A.V. (Mississippi State U.) ; Barzakh, A.E. (St. Petersburg, INP) ; Marsh, B.A. (CERN) ; Sels, S. (CERN ; Leuven U.) ; Ring, P. (Munich, Tech. U.) ; Nakada, H. (Chiba U.) ; Andreyev, A.N. (York U., England ; JAERI, Tokai) ; Van Duppen, P. (Leuven U.) ; Althubiti, N.A. (Manchester U. ; Al Jouf U.) et al.
The mean-square charge radii of $^{207,208}$Hg ($Z=80, N=127,128$) have been studied for the first time and those of $^{202,203,206}$Hg ($N=122,123,126$) remeasured by the application of in-source resonance-ionization laser spectroscopy at ISOLDE (CERN). The characteristic \textit{kink} in the charge radii at the $N=126$ neutron shell closure has been revealed, providing the first information on its behavior below the $Z=82$ proton shell closure. [...]
arXiv:2012.13802.-
2021-01-23 - 7 p.
- Published in : Phys. Rev. Lett. 126 (2021) 032502
Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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4.
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α -decay branching ratio of $^{180}\mathrm{ Pt}$
/ Cubiss, J G (York U., England) ; Harding, R D (CERN ; York U., England) ; Andreyev, A N ; Althubiti, N ; Andel, B ; Antalic, S (Comenius U.) ; Barzakh, A E (Kurchatov Inst., Moscow) ; Cocolios, T E (Leuven U. ; Manchester U.) ; Day Goodacre, T (Manchester U. ; CERN) ; Farooq-Smith, G J (Manchester U. ; Leuven U.) et al.
/CMS
A study of the $^{180}\mathrm{Hg}$ decay chain performed at the CERN-ISOLDE facility has allowed the ground-state–to–ground-state α decay of $^{180}\mathrm{Pt}$ to be investigated. A more precise α-decay branching ratio of $b_{\alpha}$ $(^{180}\mathrm{Pt})=0.52(5)$% has been deduced. [...]
2020 - 4 p.
- Published in : Phys. Rev. C 101 (2020) 014314
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5.
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Charge radii, moments, and masses of mercury isotopes across the $N=126$ shell closure
/ Goodacre, T. Day (Manchester U. ; TRIUMF ; CERN) ; Afanasjev, A.V. (Mississippi State U.) ; Barzakh, A.E. (St. Petersburg, INP) ; Nies, L. (CERN ; Greifswald U.) ; Marsh, B.A. (CERN) ; Sels, S. (CERN ; Leuven U.) ; Perera, U.C. (Mississippi State U.) ; Ring, P. (Munich, Tech. U.) ; Wienholtz, F. (CERN ; Greifswald U.) ; Andreyev, A.N. (York U., England ; JAERI, Tokai) et al.
Combining laser spectroscopy in a Versatile Arc Discharge and Laser Ion Source, with Penning-trap mass spectrometry at the CERN-ISOLDE facility, this work reports on mean-square charge radii of neutron-rich mercury isotopes across the $N = 126$ shell closure, the electromagnetic moments of $^{207}$Hg and more precise mass values of $^{206-208}$Hg. The odd-even staggering (OES) of the mean square charge radii and the kink at $N = 126$ are analyzed within the framework of covariant density functional theory (CDFT), with comparisons between different functionals to investigate the dependence of the results on the underlying single-particle structure. [...]
arXiv:2111.10468.-
2021-11-30 - 20 p.
- Published in : Phys. Rev. C 104 (2021) 054322
Fulltext: PDF;
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6.
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Changes in mean-squared charge radii and magnetic moments of $^{179–184}$Tl measured by in-source laser spectroscopy
/ Barzakh, A E ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Cocolios, T E (KU Leuven, Dept. Phys. Astron. ; CERN) ; de Groote, R P (KU Leuven, Dept. Phys. Astron.) ; Fedorov, D V ; Fedosseev, V N (CERN) ; Ferrer, R (KU Leuven, Dept. Phys. Astron.) ; Fink, D A (CERN) ; Ghys, L (KU Leuven, Dept. Phys. Astron. ; SCK-CEN, Mol) ; Huyse, M (KU Leuven, Dept. Phys. Astron.) et al.
Hyperfine structure and isotope shifts have been measured for the ground and isomeric states in the neutron-deficient isotopes $^{179–184}Tl$ using the 276.9-nm transition. The experiment has been performed at the CERN-Isotope Separator On-Line facility using the in-source resonance-ionization laser spectroscopy technique. [...]
2017 - 12 p.
- Published in : Phys. Rev. C 95 (2017) 014324
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7.
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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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8.
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Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes: Coulomb excitation of $^{182}$Hg, $^{184}$Hg, $^{186}$Hg and $^{188}$Hg
/ Wrzosek-Lipska, K (Warsaw U., Heavy Ion Lab ; Leuven U.) ; Rezynkina, K (Leuven U. ; U. Strasbourg) ; Bree, N (Leuven U.) ; Zielińska, M (Warsaw U., Heavy Ion Lab ; IRFU, Saclay) ; Gaffney, L P (Liverpool U. ; Leuven U. ; CERN ; West Scotland U.) ; Petts, A (Liverpool U.) ; Andreyev, A (Leuven U. ; York U., England) ; Bastin, B (Leuven U. ; GANIL) ; Bender, M (Lyon, IPN) ; Blazhev, A (Cologne U.) et al.
The neutron-deficient mercury isotopes serve as a classical example of shape coexistence, whereby at low energy near-degenerate nuclear states characterized by different shapes appear. The electromagnetic structure of even-mass $^{182-188}$ Hg isotopes was studied using safe-energy Coulomb excitation of neutron-deficient mercury beams delivered by the REX-ISOLDE facility at CERN. [...]
2019 - 23 p.
- Published in : Eur. Phys. J. A 55 (2019) 130
Fulltext (Open Access version from publisher): PDF;
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9.
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Collectivity in the light radon nuclei measured directly via Coulomb excitation
/ Gaffney, L.P. (Leuven U. ; Liverpool U.) ; Robinson, A.P. (York U., England ; Manchester U.) ; Jenkins, D.G. (York U., England) ; Andreyev, A.N. (Leuven U. ; York U., England ; JAEA, Ibaraki) ; Bender, M. (CENBG, Gradignan) ; Blazhev, A. (Cologne U.) ; Bree, N. (Leuven U.) ; Bruyneel, B. (Cologne U.) ; Butler, P.A. (Liverpool U.) ; Cocolios, T.E. (CERN ; Manchester U.) et al.
Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around $Z=82$ and the neutron mid-shell at $N=104$. [...]
arXiv:1503.03245.-
2015-06-22 - 11 p.
- Published in : Phys. Rev. C 91 (2015) 064313
External link: Preprint
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10.
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Laser and decay spectroscopy of the short-lived isotope $^{214}$Fr in the vicinity of the $N=126$ shell closure
/ Farooq-Smith, G J (Manchester U. ; Leuven U.) ; Cocolios, T E (Manchester U. ; Leuven U.) ; Billowes, J (Manchester U.) ; Bissell, M L (Manchester U. ; Leuven U.) ; Budinčević, I (Leuven U.) ; Day Goodacre, T (Manchester U. ; CERN) ; de Groote, R P (Leuven U.) ; Fedosseev, V N (CERN) ; Flanagan, K T (Manchester U.) ; Franchoo, S (Orsay, IPN) et al.
Combined decay and laser spectroscopy measurements of the isotope $^{214}$Fr are reported, using the collinear resonance ionization spectroscopy (CRIS) technique at the ISOLDE facility at CERN. For the Iπ=(1−) spin assignment, the g-factor value of g($^{214}$Fr)=+0.241(16) corresponds to a relatively pure (π1h9/2 ⊗ ν2g9/2) ground-state configuration. [...]
2016 - 7 p.
- Published in : Phys. Rev. C 94 (2016) 054305
- Published in : Phys. Rev. C 94 (2016) 059903
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