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Confirming the Unusual Temperature Dependence of the Electric-Field Gradient in Zn
/ Haas, Heinz (Aveiro U. ; CERN) ; Zyabkin, Dmitry (Ilmenau Tech. U.) ; Schell, Juliana (CERN ; Duisburg-Essen U.) ; Dang, Thien T (Duisburg-Essen U.) ; Yap, Ian C J (Gottingen U., II. Phys. Inst.) ; Michelon, Ilaria (Padua U.) ; Gaertner, Daniel (Munster U.) ; Gerami, Adeleh Mokhles (IPM, Tehran) ; Noll, Cornelia (Bonn U.) ; Beck, Reinhard (Bonn U.)
The electric-field gradient (EFG) at nuclei in solids is a sensitive probe of the charge distribution. Experimental data, which previously only existed in insulators, have been available for metals with the development of nuclear measuring techniques since about 1970. [...]
2022 - 8 p.
- Published in : Crystals 12 (2022) 1064
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MULTIPAC-Setup for Perturbed Angular Correlation Experiments in Multiferroic (and Magnetic) Materials: proof-of-concept
/ Schell, Juliana (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland and Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Lupascu, Doru (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Dang, Thien (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Yap, Ian (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Escobar, Marianela (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Schmuck, Merlin (Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Haas, Heinz (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland and Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal) ; Johnston, Karl (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland) ; Kowalska, Magdalena (European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland) ; Carbonari, Artur (Instituto de Pesquisas Energéticas e Nucleares IPEN-CNEN/SP, São Paulo 05508-000, Brazil) et al.
CERN-INTC-2023-012 ; INTC-I-249.
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2023.
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Free Molecule Studies by Perturbed $\gamma - \gamma$ Angular Correlation: A New Path to Accurate Nuclear Quadrupole Moments
/ Haas, Heinz (CERN ; U. Aveiro (main)) ; Röder, Jens (CERN ; U. Aveiro (main)) ; Correia, Joao G (CERN ; IST, Lisbon (main)) ; Schell, J (CERN ; U. Duisburg-Essen) ; Fenta, Abel S (U. Aveiro (main)) ; Vianden, Reiner (Bonn U., HISKP) ; Larsen, Emil M H (U. Copenhagen (main)) ; Aggelund, Patrick A (U. Copenhagen (main)) ; Fromsejer, Rasmus (U. Copenhagen (main)) ; Hemmingsen, Lars B S (U. Copenhagen (main)) et al.
Accurate nuclear quadrupole moment values are essential as benchmarks for nuclear structure models
and for the interpretation of experimentally determined nuclear quadrupole interactions in terms of
electronic and molecular structure. Here, we present a novel route to such data by combining perturbed γ-γ
angular correlation measurements on free small linear molecules, realized for the first time within this
work, with state-of-the-art ab initio electronic structure calculations of the electric field gradient at the
probe site. [...]
2021 - 6 p.
- Published in : Phys. Rev. Lett. 126 (2021) 103001
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Last 3 years of the SC-ISOLDE and move to PS-Booster
/ HAAS, Heinz (speaker) (CERN-ISOLDE)
In 1987 the very successful operation of ISOLDE-2 could be continued with an ever increasing number of users. The ISOLDE-3 facility was finished in 1988 and made available too, even in high-resolution mode. [...]
2014 - 1102.
ISOLDE; ISOLDE Workshop and Users meeting 2014 "50th Anniversary Edition"
External links: Talk details; Event details
In : ISOLDE Workshop and Users meeting 2014 "50th Anniversary Edition"
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Oxygen ordering in the high-T$_c$ superconductor HgBa$_2$CaCu$_2$O$_{6+\delta}$ as revealed by perturbed angular correlation
/ Mendonca, Tania Melo (Neel Lab, Grenoble ; Porto U.) ; Correia, Joao Guilherme (ITN, Sacavem ; Lisbon U., CFNUL) ; Haas, Heinz (ITN, Sacavem) ; Odier, Philippe (Neel Lab, Grenoble) ; Tavares, Pedro (UTAD, Vila Real) ; Silva, Manuel Ribeiro (Lisbon U., CFNUL) ; Lopes, Armandina (Lisbon U., CFNUL) ; Pereira, Andre (Porto U.) ; Goncalves, Joao Nuno (U. Aveiro) ; Amaral, Joao (U. Aveiro) et al.
Lattice sites and collective ordering of oxygen atoms in HgBa$_2$CaCu$_2$O$_{6+\delta}$ were studied using the perturbed angular correlation (PAC) technique at ISOLDE/CERN. The electric field gradients (EFG) at $^{199m}$Hg nuclei have been measured as functions of oxygen doping on the Hg planes, above and below T$_c$. [...]
CERN-OPEN-2014-022.-
Geneva : CERN, 2011 - 10 p.
- Published in : Phys. Rev. B 84 (2011) 094524
Preprint: PDF;
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Perturbed angular correlations studies in the HgBa$_2$CaCu$_2$O$_{6+\delta}$ high-T$_c$ superconductor
/ Mendonca, Tania Melo (Porto U.) ; Correia, Joao Guilherme (ITN, Sacavem) ; Haas, Heinz (ITN, Sacavem) ; Odier, Philippe (Neel Lab, Grenoble) ; Tavares, Pedro (UTAD, Vila Real) ; SIlva, Manuel Ribeiro (Lisbon U., CFNUL) ; Lopes, Armandina (Lisbon U., CFNUL) ; Darie, Celine (Neel Lab, Grenoble) ; Araujo, Joao Pedro (Porto U.)
The electric field gradients at $^{199m}$Hg nuclei have been measured via the perturbed angular correlation (PAC) technique, allowing a full characterization of the Hg neighborhood charge distribution at high oxygen doping on the Hg planes. The PAC technique has been applied to investigate the effect of high oxygen pressure during the measurement. [...]
CERN-OPEN-2014-021.-
Geneva : CERN, 2011 - 4 p.
- Published in : J. Supercond. Novel Magn. 24 (2011) 1153-1156
Preprint: PDF;
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