CERN Accelerating science


Letzte Einträge:
Isotope Shifts of Radium Monofluoride Molecules / Udrescu, S M (MIT) ; Brinson, A J (MIT) ; Ruiz, R F Garcia (MIT ; CERN) ; Gaul, K (Philipps U. Marburg) ; Berger, R (Philipps U. Marburg) ; Billowes, J (Manchester U.) ; Binnersley, C L (Manchester U.) ; Bissell, M L (Manchester U.) ; Breier, A A (Kassel U.) ; Chrysalidis, K (CERN) et al.
Isotope shifts of $^{223-226,228}$ Ra$^{19}$F were measured for different vibrational levels in the electronic transition $A^2 \Pi_{1/2} \leftarrow X^2 \Sigma^+$. The observed isotope shifts demonstrate the particularly high sensitivity of radium monofluoride to nuclear size effects, offering a stringent test of models describing the electronic density within the radium nucleus [...]
2021 - 7 p. - Published in : Phys. Rev. Lett. 127 (2021) 033001

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Lattice Location Studies of the Amphoteric Nature of Implanted Mg in GaN / IS634 Collaboration
Despite the renewed interest in ion implantation for doping of GaN, efficient electrical activation remains a challenge. We investigate in detail the lattice location of 27Mg in GaN of different doping types as a function of implantation temperature and fluence at CERN’s ISOLDE facility [...]
- Published in : Advanced Electronic Materials 7 (2021) 2100345 Submitted version, due to embargo period until 19.6.2022: PDF; Supporting Information: PDF;

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Thermal stability of interstitial and substitutional Mn in ferromagnetic (Ga,Mn)As / IS580 Collaboration
In (Ga,Mn)As, a model dilute magnetic semiconductor, the electric and magnetic properties are strongly influenced by the lattice sites occupied by the Mn atoms. In particular, the highest Curie temperatures are achieved upon thermal annealing in a narrow temperature window around 200°C, by promoting the diffusion of interstitial Mn towards the surface. [...]
- Published in : Physical Review B100 (2019) 144409 Reprint of published article: PDF;

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Competition between allowed and first-forbidden $β$ decays of $^{208}$At and expansion of the $^{208}$Po level scheme / Brunet, M (Surrey U.) ; Podolyák, Zs (Surrey U.) ; Berry, T A (Surrey U.) ; Brown, B A (Michigan State U., NSCL) ; Carroll, R J (Surrey U.) ; Lica, R (CERN ; Bucharest, IFIN-HH) ; Sotty, Ch (Bucharest, IFIN-HH ; Leuven U.) ; Andreyev, A N (York U., England ; JAEA, Ibaraki) ; Borge, M J G (CERN) ; Cubiss, J G (CERN ; Madrid U.) et al.
The structure of $^{208}$Po populated through the EC/$β^+$ decay of $^{208}$At is investigated using $γ$-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed $γ$ rays which have been (re)assigned a position. [...]
2021 - 13 p. - Published in : Phys. Rev. C 103 (2021) 054327 Fulltext: PDF;

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Lattice sites of implanted Na in GaN and AlN in comparison to other light alkalis and alkaline earths / Wahl, Ulrich (Universidade de Lisboa (PT)) ; David Bosne, Eric (Universidade de Lisboa (PT)) ; Amorim, Lígia (KU Leuven) ; Granadeiro Costa, Angelo Rafael (Universidade de Lisboa (PT)) ; De Vries, Bart (KU Leuven) ; Martins Correia, Joao (Universidade de Lisboa (PT)) ; da Silva, Manuel Ribeiro (CICECO Aveiro) ; Da Costa Pereira, Lino Miguel (KU Leuven (BE)) ; Vantomme, André (KU Leuven) /IS634 Collaboration
The lattice location of ion implanted radioactive 24Na (t1/2=14.96 h) in GaN and AlN was determined using the emission channeling technique at the ISOLDE/CERN facility. In the room temperature as-implanted state in both GaN and AlN, the majority of the sodium atoms are found on interstitial sites near the octahedral position, with a minority on cation Ga or Al substitutional sites. [...]
CERN-ISOLDE-2021-003.- 2021 - 12 p. - Published in : J. Appl. Phys. 128 (2020) 045703 Postprint: PDF; Supplemental Material: PDF;

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Direct Structural Identification and Quantification of the Split-Vacancy Configuration for Implanted Sn in Diamond / Wahl, Ulrich (Universidade de Lisboa (PT)) ; Martins Correia, Joao (Universidade de Lisboa (PT)) ; Villarreal, Renan (KU Leuven) ; Bourgeois, Emilie (Hasselt University) ; Gulka, Michal (Hasselt University) ; Nesladek, Milos (Hasselt University) ; Vantomme, André (KU Leuven) ; Da Costa Pereira, Lino Miguel (KU Leuven (BE)) /EC-SLI Collaboration ; IS368 Collaboration
We demonstrate formation of the ideal split-vacancy configuration of the Sn-vacancy center upon implantation into natural diamond. Using beta-emission channeling following low fluence 121Sn implantation (2E12 atoms/cm2, 60 keV) at the ISOLDE facility at CERN, we directly identified and quantified the atomic configurations of the Sn-related centers. [...]
CERN-ISOLDE-2021-002.- 2021 - 7 p. - Published in : Phys. Rev. Lett. 125 (2020) 045301 Postprint: PDF; Supplemental material: PDF;

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HI-TREX—A highly integrated transfer setup at REX-(HIE)ISOLDE / Berner, C (Munich, Tech. U.) ; Werner, L (Munich, Tech. U.) ; Gernhäuser, R (Munich, Tech. U.) ; Kröll, Th (Darmstadt, Tech. U.)
Transfer reactions are a unique tool to populate and probe the structure of nuclei. Due to its unprecedented capabilities in producing and accelerating exotic nuclei, the HIE-ISOLDE facility at CERN provides an excellent opportunity for transfer experiments using radioactive ion beams. [...]
2020 - 10 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 987 (2021) 164827

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Nuclear structure of $^{181}$Au studied via $\beta^+$/EC decay of $^{181}$Hg at ISOLDE / Sedlák, M (Bratislava, Inst. Phys.) ; Venhart, M (Bratislava, Inst. Phys.) ; Wood, J L (Bratislava, Inst. Phys.) ; Matoušek, V (Bratislava, Inst. Phys.) ; Balogh, M (Bratislava, Inst. Phys.) ; Boston, A J (Liverpool U.) ; Cocolios, T E (Liverpool U.) ; Harkness-Brennan, L J (Liverpool U.) ; Herzberg, R D (Liverpool U.) ; Joss, D T (Liverpool U.) et al.
The $\beta ^+$/EC decay of mass separated samples of $^{181}$Hg was studied employing the TATRA spectrometer at the ISOLDE facility at CERN. The decay scheme was constructed for the first time. [...]
2020 - 10 p. - Published in : Eur. Phys. J. A 56 (2020) 161

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Magnetic Moments of Short-Lived Nuclei with Part-per-Million Accuracy: Toward Novel Applications of $\beta$-Detected NMR in Physics, Chemistry, and Biology / Harding, R.D. (CERN ; York U., England ; U. Nottingham) ; Pallada, S. (CERN) ; Croese, J. (CERN ; Geneva U.) ; Antušek, A. (Slovak Tech. U.) ; Baranowski, M. (Mickiewicz U., Poznan) ; Bissell, M.L. (Manchester U.) ; Cerato, L. (U. Geneva (main)) ; Dziubinska-Kühn, K.M. (CERN ; U. Leipzig (main)) ; Gins, W. (Leuven U.) ; Gustafsson, F.P. (Leuven U.) et al.
We determine for the first time the magnetic dipole moment of a short-lived nucleus with part-per-million (ppm) accuracy. To achieve this two orders of magnitude improvement over previous studies, we implement a number of innovations into our $\beta$-detected Nuclear Magnetic Resonance ($\beta$-NMR) setup at ISOLDE/CERN. [...]
arXiv:2004.02820.- 2020-12-29 - 15 p. - Published in : Phys. Rev. X 10 (2020) 041061 Fulltext: PDF; Fulltext from Publisher: PDF;

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The origin of the elements and other implications of gravitational wave detection for nuclear physics / Lunney, David /ISOLTRAP Collaboration
The neutron-star collision revealed by the event GW170817 gave us a first glimpse of a possible birthplace of most of our heavy elements. The multi-messenger nature of this historical event combined gravitational waves, a gamma-ray burst and optical astronomy of a “kilonova”, bringing the first observations of rapid neutron capture (r process) nucleosynthesis after 60 years of speculation. [...]
- Published in : 4open 3 (2020) 14 Fulltext: PDF;

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