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Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive $^{222}\mathrm{Ra}$ and $^{228}\mathrm{Ra}$ Beams
/ Butler, P.A. (U. Liverpool (main)) ; Gaffney, L.P. (U. Liverpool (main) ; CERN) ; Spagnoletti, P. (Paisley U.) ; Abrahams, K. (Western Cape U.) ; Bowry, M. (Paisley U. ; TRIUMF) ; Cederkäll, J. (Lund U.) ; de Angelis, G. (INFN, Legnaro) ; De Witte, H. (Leuven U.) ; Garrett, P.E. (Guelph U.) ; Goldkuhle, A. (Cologne U.) et al.
There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in $^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. [...]
arXiv:2001.09681.-
2020-02-01 - 6 p.
- Published in : Phys. Rev. Lett. 124 (2020) 042503
Fulltext: PDF; Fulltext from publisher: PDF;
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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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3.
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The observation of vibrating pear-shapes in radon nuclei
/ Butler, P.A. (Liverpool U.) ; Gaffney, L.P. (Liverpool U. ; CERN) ; Spagnoletti, P. (West Scotland U.) ; Konki, J. (CERN) ; Scheck, M. (West Scotland U.) ; Smith, J.F. (West Scotland U.) ; Abrahams, K. (Western Cape U.) ; Bowry, M. (TRIUMF) ; Cederkäll, J. (Lund U.) ; Chupp, T. (Michigan U.) et al.
There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the standard model of particle physics. [...]
arXiv:2003.10147.-
2019-06-06 - 6 p.
- Published in : Nature Commun. 10 (2019) 2473
Fulltext: 2003.10147 - PDF; 7a6aa522dd658653207485bc1ee38876 - PDF; s41467-019-10494-5 - PDF;
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4.
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Shape Coexistence in the Neutron-Deficient Even-Even $^{182-188}$Hg Isotopes Studied via Coulomb Excitation
/ Bree, N (KU Leuven, Dept. Phys. Astron.) ; Wrzosek-Lipska, K (KU Leuven, Dept. Phys. Astron.) ; Petts, A (U. Liverpool (main)) ; Andreyev, A (KU Leuven, Dept. Phys. Astron.) ; Bastin, B (KU Leuven, Dept. Phys. Astron. ; GANIL) ; Bender, M (CENBG, Gradignan) ; Blazhev, A (Cologne U.) ; Bruyneel, B (Cologne U.) ; Butler, P A (U. Liverpool (main)) ; Butterworth, J et al.
Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with 2.85 MeV/nucleon mercury beams from REX-ISOLDE. Magnitudes and relative signs of the reduced E2 matrix elements that couple the ground state and low-lying excited states in Hg182-188 were extracted. [...]
2014 - 5 p.
- Published in : Phys. Rev. Lett. 112 (2014) 162701
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5.
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Shape determination in Coulomb excitation of $^{72}$Kr
/ Nara-Singh, B S (University of York Heslington York YO10 5DD United Kingdom) ; Jenkins, D G (University of York Heslington York YO10 5DD United Kingdom) ; Barton, C J (University of York Heslington York YO10 5DD United Kingdom) ; Bentley, M (University of York Heslington York YO10 5DD United Kingdom) ; Butterworth, J E (University of York Heslington York YO10 5DD United Kingdom) ; Taylor, M J (University of York Heslington York YO10 5DD United Kingdom) ; Wadsworth, R (University of York Heslington York YO10 5DD United Kingdom) ; Cederkäll, J (ISOLDE CERN CH-1211 Geneva 23 Switzerland) ; Clément, E (ISOLDE CERN CH-1211 Geneva 23 Switzerland) ; Delahaye, P (ISOLDE CERN CH-1211 Geneva 23 Switzerland) et al.
CERN-INTC-2008-042 ; INTC-CLL-004.
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2008.
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6.
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Internal decay of the (10$^{-}$) intruder state in $^{184}$TI
/ Van Beveren, C (Leuven U.) ; Andreyev, A N (York U., England ; JAEA, Ibaraki) ; Barzakh, A E (St. Petersburg, INP) ; Cocolios, T E (CERN ; Manchester U.) ; Fedorov, D (St. Petersburg, INP) ; Fedosseev, V N (CERN) ; Ferrer, R (Leuven U.) ; Huyse, M (Leuven U.) ; Köster, U (Laue-Langevin Inst.) ; Lane, J (Paisley U.) et al.
Decay spectroscopy of $^{184}$TI has been performed at the CERN Isotope Separator On-Line (ISOLDE) facility. An excitation energy of 506.1(1) keV and a half-life of 47.1(7) ms of the intruder based (10−) state have been extracted. [...]
APS, 2015 - 8 p.
- Published in : Phys. Rev. C 92 (2015) 014325
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7.
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Low-spin states in $^{80}$Ge populated in the $\beta$ decay of the $^{80}$Ga $3^-$ isomer
/ Sekal, S (Algiers U. Sci. Tech. ; CERN) ; Fraile, L M (Madrid U.) ; Lică, R (CERN ; Bucharest, IFIN-HH) ; Borge, M J G (Madrid, Inst. Estructura Materia) ; Walters, W B (Maryland U., Dept. Chem.) ; Aprahamian, A (Notre Dame U.) ; Benchouk, C (Algiers U. Sci. Tech.) ; Bernards, C (Yale U. (main) ; Cologne U.) ; Briz, J A (Madrid, Inst. Estructura Materia) ; Bucher, B (Idaho Natl. Lab.) et al.
The structure of
$^{80}$Ge has been investigated at the ISOLDE facility at CERN. A previous study reported for the first time a low-lying $0^+_2$ intruder state at 639 keV, based on the coincidence with a previously unobserved 1764-keV $γ$ ray, and suggested it as evidence for shape coexistence in $^{80}$Ge. [...]
2021 - 12 p.
- Published in : Phys. Rev. C 104 (2021) 024317
Fulltext: PDF;
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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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Fast-timing study of the $l$-forbidden $1/2^+ \rightarrow 3/2^+ M1$ transition in $^{129}Sn$
/ Lică, R (CERN ; Bucharest, IFIN-HH) ; Mach, H (Warsaw, Inst. Nucl. Studies) ; Fraile, L M (UCM, Madrid, Dept. Phys.) ; Gargano, A (INFN, Naples) ; Borge, M J G (CERN ; Madrid, Inst. Estructura Materia) ; Mărginean, N (Bucharest, IFIN-HH) ; Sotty, C O (Bucharest, IFIN-HH ; Leuven U.) ; Vedia, V (UCM, Madrid, Dept. Phys.) ; Andreyev, A N (York U., England) ; Benzoni, G (INFN, Milan) et al.
The levels in Sn129 populated from the β− decay of In129 isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 1/2+ state and the 3/2+ ground state in Sn129 are expected to have configurations dominated by the neutron s1/2 (l=0) and d3/2 (l=2) single-particle states, respectively. [...]
2016 - 7 p.
- Published in : Phys. Rev. C 93 (2016) 044303
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10.
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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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