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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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PAC study of the static and dynamic aspects of an atom inside a fullerene cage
/ Das, S K (Bhabha Atomic Res. Ctr.) ; Guin, R (Bhabha Atomic Res. Ctr.) ; Banerjee, D (Bhabha Atomic Res. Ctr.) ; Das, P (Bhabha Atomic Res. Ctr.) ; Butz, T (Leipzig U.) ; Amaral, V S (Aveiro U.) ; Correia, J G (ITN, Sacavem ; CERN) ; Barbosa, M B (ITN, Sacavem ; CERN)
CERN-INTC-2011-001 ; INTC-I-131.
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2011.
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3.
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First principles calculations of hyperfine parameters on the Ca manganite with substitutional Cd-modeling of a PAC experiment
/ Goncalves, JN (Aveiro U.) ; Correia, J G (CERN ; ITN, Sacavem) ; Lopes, A M L (Lisbon U.) ; Haas, H (CERN) ; Amaral, V S (Aveiro U.) ; Goncalves, J N (Aveiro U.)
The APW + lo (augmented plane waves + local orbitals) method of density functional theory, as implemented in the Wien2k code, is applied to calculate the electric field gradient of manganites. We report the first principles calculations on CaMnO3, and modeling of a perturbed angular correlation experiment with implanted Cd-111m isotope. [...]
2010
- Published in : J. Magn. Magn. Mater. 322 (2010) 1170-1173
In : Joint European Magnetic Symposia, Dublin, Ireland, 14 - 19 Sep 2008, pp.1170-1173
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4.
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Nanostructures and thin films of transparent conductive oxides studied by perturbed angular correlations
/ Barbosa, M B (Porto U.) ; Gonçalves, J N (Aveiro U.) ; Redondo-Cubero, A (ITN, Sacavem ; Lisbon U., CFNUL) ; Miranda, S M C (ITN, Sacavem) ; Simon, R (Bonn U., HISKP) ; Kessler, P (Bonn U., HISKP) ; Brandt, M (Humboldt-U., Berlin) ; Henneberger, F (Humboldt-U., Berlin) ; Nogales, E (U. Complutense, Madrid) ; Méndez, B (U. Complutense, Madrid) et al.
The versatility of perturbed angular correlations (PAC) in the study of nanostructures and thin films is demonstrated, namely for the specific cases of ZnO/Cd$_x$Zn$_{1-x}$O thin films and Ga$_2$O$_3$ powder pellets and nanowires, examples of transparent conductive oxides. PAC measurements as a function of annealing temperature were performed after implantation of $^{111m}$Cd$/^{111}$Cd (T$_{1/2}$=48$\,$min.) and later compared to density functional theory simulations. [...]
CERN-OPEN-2014-017.-
Porto : IFIMUP-In, 2013 - 8 p.
- Published in : Phys. Status Solidi B 250 (2013) 801-808
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Cd doping of AlN via ion implantation studied with perturbed angular correlation
/ Kessler, Patrick (Bonn U., HISKP) ; Lorenz, Katharina (ITN, Sacavem ; Lisbon U., CFNUL) ; Miranda, Sérgio MC (ITN, Sacavem) ; Simon, R (Bonn U., HISKP) ; Correia, João Guilherme (ITN, Sacavem) ; Johnston, Karl (Saarland U.) ; Vianden, Reiner (Bonn U., HISKP)
AlN with a wide bandgap of 6.2 eV is a promising candidate for ultraviolet light-emitting diodes and laser diodes. However, the production of the required p-type AlN is still challenging. [...]
CERN-OPEN-2014-016.-
Geneva : ISOLDE, 2012 - 5 p.
- Published in : Phys. Status Solidi, C 9 (2012) 1032-1035
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Lattice location of implanted As in ZnO
/ Wahl, U (ITN, Sacavem ; Lisbon U.) ; Rita, E (ITN, Sacavem ; Lisbon U.) ; Correia, J G (ITN, Sacavem ; Lisbon U.) ; Marques, A C (Lisbon U. ; CERN) ; Alves, E (ITN, Sacavem ; Lisbon U.) ; Soares, J C
Radioactive 73As ions were implanted into a ZnO single crystal at room temperature with 60 keV up to a fluence of 2×1013 cm−2. Subsequently, the angular emission channeling patterns of emitted conversion electrons were recorded by means of a position-sensitive detector in the as-implanted state and following annealing up to 900 C, and were compared to simulated emission yields for a variety of different lattice sites. [...]
2007
- Published in : Superlattices Microstruct. 42 (2007) 8-13
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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
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Radiation protection, radiation safety and radiation shielding assessment of hie-isolde
/ Romanets, Y (ITN, Sacavem) ; Bernardes, A.P (CERN) ; di Maria, S (ITN, Sacavem) ; Dorsival, A (CERN) ; Goncalves, I.F (ITN, Sacavem) ; Kadi, Y (CERN) ; Vaz, P (ITN, Sacavem) ; Vlachoudis, V (CERN) ; Vollaire, J (CERN)
2013 - 13 p.
- Published in : Radiat. Prot. Dosim. 155 (2013) 351-363
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9.
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Measurement of the (236)U(n, f) Cross Section at n_TOF
/ Sarmento, R (ITN, Sacavem) ; Goncalves, I F (ITN, Sacavem) ; Vaz, P (ITN, Sacavem) ; Colonna, N (INFN, Bari) ; Calviani, M (CERN)
A precise knowledge of the (236)U neutron-induced fission cross-section is required for the development of accelerator-driven systems and reactors based on the Th-U cycle. The evaluated data presently stored in the nuclear data libraries rely on outdated experimental measurements and show large discrepancies in the energy region between 1 keV and 100 keV. [...]
2011
- Published in : J. Korean Phys. Soc. 59 (2011) 1793-1796
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Direct evidence for Sb as a Zn site impurity in ZnO
/ Wahl, U (ITN, Sacavem ; Lisbon U., CFNUL) ; Correia, J G (ITN, Sacavem ; Lisbon U., CFNUL ; CERN) ; Mendonça, T (Porto U.) ; Decoster, S (Leuven U.)
/EC-SLI Collaboration
The lattice location of ion implanted antimony in zinc oxide has been determined by means of $\beta^{-}$-emission channeling from the radioactive $^{124}$Sb isotope. Following 30 keV implantation of $^{124}$Sb into a single-crystalline ZnO sample to a fluence of $1 \times 10^{14}$ cm$^{−2}$, the angular-dependent emission rate of $\beta^{-}$−particles around several crystallographic directions was measured with a position-sensitive Si detector. [...]
CERN-OPEN-2013-006.-
Sacavém : Instituto Tecnológico e Nuclear, 2009 - 3 p.
- Published in : Appl. Phys. Lett. 94 (2009) 261901
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