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1.
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Microscopic insight by nuclear hyperfine methods on ferroic Perovskites
/ Lopes, A M L ; Schell, J H ; Carbonari, A W ; Amaral, V S ; Araujo, J P ; Lupascu, D C ; Dang, T T ; Yap, I C J ; Burimova, A ; Correia, J G et al.
CERN-INTC-2023-045 ; INTC-CLL-054.
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2023.
Fulltext - Original Document (INTC-P-663)
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2.
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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
Fulltext: PDF;
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3.
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Hg adatoms on graphene: A first-principles study
/ Fenta, A S (CERN) ; Amorim, C O (Aveiro U.) ; Gonçalves, J N (Aveiro U.) ; Fortunato, N (Aveiro U.) ; Barbosa, M B (Porto U.) ; Araujo, J P (Leuven U.) ; Houssa, M (U. Gent (main)) ; Cottenier, S (U. Gent (main)) ; Van Bael, M J (Leuven U.) ; Correia, J G (CERN) et al.
The interest in understanding the interaction between graphene and atoms that are adsorbed on its
surface (adatoms) spans a wide range of research fields and applications, for example, to
controllably change the properties of graphene in electronic devices or to detect those changes in
graphene-based sensors. We present a density functional theory study of the interaction between
graphene and Hg adatoms. [...]
2020 - 10 p.
- Published in : J. Phys. Mater. 4 (2020) 015002
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4.
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The electric field gradient as a signature of the binding and the local structure of adatoms on graphene
/ Fenta, A S (Leuven U. ; Aveiro U. ; CERN) ; Amorim, C O (Aveiro U.) ; Gonçalves, J N (Aveiro U.) ; Fortunato, N (Aveiro U.) ; Barbosa, M B (Porto U. ; Singapore Natl. U.) ; Cottenier, S (Gent U.) ; Correia, J G (CERN ; Lisbon, IST) ; Pereira, L M C (Leuven U.) ; Amaral, V S (Aveiro U.)
We examined the interaction between adatoms and graphene for Ag, Cd, In and Hg by density functional theory. We establish a relation between the binding energy and the electric-field gradient tensor (EFG) for each atom, which indicates that hyperfine interactions can be used to probe the binding and stability of adatoms on graphene. [...]
2021
- Published in : Appl. Phys. A 127 (2021) 573
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5.
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Ultra sensitive quantification of Hg$^{2+}$ sorption by functionalized nanoparticles using radioactive tracker spectroscopy
/ Amorim, Carlos O (Aveiro U. ; U. Aveiro (main)) ; Gonçalves, João N (Aveiro U.) ; Tavares, Daniela S (U. Aveiro (main)) ; Fenta, Abel S (Aveiro U. ; CERN ; Leuven U.) ; Lopes, Cláudia B (U. Aveiro (main) ; CIIMAR, Porto) ; Pereira, Eduarda (U. Aveiro (main)) ; Trindade, Tito (U. Aveiro (main)) ; Correia, João G (CERN ; IST, Lisbon (main)) ; Amaral, Vítor S (Aveiro U.)
/Isolde
We present an ultra sensitive method to quantify the uptake of Hg by dithiocarbamate functionalized magnetic nanoparticles using radioactive tracker spectroscopy. We show a lower limit of detection of about 10 fg L-1, much lower than any other known techniques used to determine the uptake of Hg (about 104 more sensitive), without the need of digesting or processing the sorption agent. [...]
2018 - 6 p.
- Published in : Microchem. J. 138 (2018) 418-423
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The $^{68m}$Cu/$^{68}$Cu isotope as a new probe for hyperfine studies: The nuclear moments
/ Fenta, A S (Aveiro U. ; Leuven U. ; CERN) ; Pallada, S (CERN ; Copenhagen U. ; Democritus U., Thrace) ; Correia, J G (CERN ; IST/ITN, Lisbon) ; Stachura, M (CERN ; TRIUMF) ; Johnston, K (CERN) ; Gottberg, A (CERN ; TRIUMF) ; Mokhles Gerami, A (K.N. Toosi U.) ; Röder, J (CERN ; RWTH Aachen U.) ; Grawe, H (Darmstadt, GSI) ; Brown, B A (Michigan State U., NSCL) et al.
Time Differential Perturbed Angular Correlation of γ-rays (TDPAC) experiments were performed for the first time in the decay of 68m Cu $(6^{-}, 721\ \text{keV}, 3.75\ \text{min})$ produced at the ISOLDE facility at CERN. Due to the short half-life of the source isotope, the measurements were carried out online. [...]
2016
- Published in : Europhys. Lett. 115 (2016) 62002
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7.
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Local Probing Of Ferroic And Multiferroic Compounds
/ Lopes, A M L (IFIMUP-IN, Fac. Ciências, Univ. Porto, P-4150 Porto, Portugal) ; Schell, Juliana (Institute for Materials Science and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen) ; Amaral, V S (Dep. Physics and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Amorim, C O (Dep. Physics and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Araújo, J P (IFIMUP, Fac. Ciências, Univ. Porto, P-4150 Porto, Portugal) ; Baghizadeh, A (Dep. Mat & Cer. Eng. and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Baptista, M (IFIMUP, Fac. Ciências, Univ. Porto, P-4150 Porto, Portugal) ; Becker, Hans-Werner (Ruhr-Universität Bochum, RUBION, Universitätsstr. 150, D-44801 Bochum) ; Correia, J G (C2TN, Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Portugal) ; Escobar Castillo, M (Institute for Materials Science and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) et al.
CERN-INTC-2017-074 ; INTC-CLL-034.
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2017.
Fulltext
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8.
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Local Probing of Ferroic and Multiferroic Compounds
/ Amaral, V S (Dep. Physics and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Amorim, C O (Dep. Physics and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Araujo, J P (IFIMUP, Fac. Ciências, Univ. Porto, P-4150 Porto, Portugal) ; Baghizadeh, A (Dep. Mat & Cer. Eng. and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Baptista, M (IFIMUP, Fac. Ciências, Univ. Porto, P-4150 Porto, Portugal) ; Becker, Hans-Werner (Ruhr-Universität Bochum, RUBION, Universitätsstr. 150, D-44801 Bochum) ; Correia, J G (C2TN, Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Portugal) ; Escobar Castillo, M (Institute for Materials Science and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany) ; Fenta, A (Dep. Physics and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) ; Gonçalves, J N (Dep. Physics and CICECO, Univ. Aveiro, P-3810-193 Aveiro, Portugal) et al.
CERN-INTC-2017-020 ; INTC-P-502.
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2017.
Fulltext
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9.
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Perturbed Angular Correlation Study of the Static and Dynamic Aspects of Cadmium and Mercury Atoms Inside and Attached to a C60 Fullerene Cage
/ Das, Satyendra K (Bhabha Atomic Res. Ctr.) ; Guin, Rashmohan (Bhabha Atomic Res. Ctr.) ; Banerjee, Debasish (Bhabha Atomic Res. Ctr.) ; Johnston, Karl (CERN) ; Das, Parnika (Calcutta, VECC) ; Butz, Tilman (Leipzig U.) ; Amaral, Vitor S (U. Aveiro (main) ; Aveiro U.) ; Correia, Joao G (CERN ; ITN, Sacavem) ; Barbosa, Marcelo B (CERN ; ITN, Sacavem)
30 keV Cd-111m and 50 keV Hg-199m beams from ISOLDE were used to implant on preformed targets of C-60 with a thickness of 1 mg cm(-2). Endofullerene compounds, viz. [...]
2014 - 8 p.
- Published in : Z. Naturforsch. A 69 (2014) 611-618
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10.
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Hyperfine interactions in MnAs studied by perturbed angular correlations of $\gamma$-rays using the probe $^{77}$Br $\rightarrow ^{77}$Se and first principles calculations for MnAs and other Mn pnictides
/ Gonçalves, J N (U. Aveiro) ; Amaral, V S (U. Aveiro) ; Correia, J G (IST/ITN, Lisbon) ; Lopes, A M L (Lisbon U., CFNUL)
The MnAs compound shows a first-order transition at T$_{c}$≈ 42$^{\circ}$C, and a second-order transition at T$_{t}$ ≈120$^{\circ}$C. The first-order transition, with structural (hexagonal-orthorhombic), magnetic (FM-PM) and electrical conductivity changes, is associated to magnetocaloric, magnetoelastic, and magnetoresistance effects. [...]
arXiv:1402.0352; CERN-OPEN-2014-024.-
Aveiro : U. Aveiro, 2011 - 21 p.
- Published in : Phys. Rev. B 83 (2011) 104421
Preprint: PDF;
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