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  1. Article

    Open Access

    First operation of the KATRIN experiment with tritium

    The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of \(\upbeta \)β-decay, provide a largely mod...

    Max Aker, Konrad Altenmüller, Marius Arenz… in The European Physical Journal C (2020)

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  2. No Access

    Article

    Growth of Ga2O3 by furnace oxidation of GaN studied by perturbed angular correlations

    Ga2O3 is a promising material for use in “solar-blind” UV-detectors which can be produced efficiently by oxidation of GaN. In this study we focus on the evolution of the oxide layer when GaN is heated in air. The...

    Michael Steffens, Reiner Vianden, Alberto F. Pasquevich in Hyperfine Interactions (2016)

  3. No Access

    Article

    Search for magnetic interaction in In doped AlN using perturbed angular correlation spectroscopy

    The possible presence of a large magnetic field due to spin polarization of a Cd nucleus (decay product of 111In) at an Al substitutional site in AlN is investigated with perturbed angular correlation (PAC) spect...

    Ishita Agarwal, Patrick Kessler, Reiner Vianden in Hyperfine Interactions (2013)

  4. No Access

    Article

    Electric field gradient in nanostructured SnO2 studied by means of PAC spectroscopy using 111Cd or 181Ta as probe nuclei

    Electric quadrupole interactions were studied in pure and Mn-doped powder samples and thin films of SnO2 using perturbed γγ angular correlation spectroscopy (PAC). The powder samples were prepared by Sol gel meth...

    Juliana Marques Ramos, Thiago Martucci, Artur Wilson Carbonari… in Hyperfine Interactions (2013)

  5. Article

    Implantation Studies on Silicon-Doped GaN

    Silicon-doped GaN layers grown by low-pressure metalorganic vapor-phase epitaxy with Si concentrations ranging from 2 × 1017 Si/cm3 to 9.2 × 1018 Si/cm3 were investigated by means of the perturbed angular correla...

    Ronnie Simon, Reiner Vianden, Klaus Köhler in Journal of Electronic Materials (2013)

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  6. No Access

    Article

    Growth of germanium–carbide thin film on crystal substrate

    The formation of germanium-carbide in crystalline germanium substrate is studied using the perturbed γ–γ angular correlation (PAC) method. The growth of Ge–C micro-crystalline system in the host matrix was obs...

    Genene Tessema, Mulugeta Bekele… in Journal of Materials Science: Materials in… (2010)

  7. No Access

    Article

    Temperature dependence of the hyperfine fields of 111In in sapphire (Al2O3) single crystals

    The decay of 111In to 111Cd via electron capture, accompanied by Auger electrons, leaves the outermost atomic shells of the cadmium in a highly ionized state. The recovery of the electron shells depends strongly ...

    Michael Steffens, Jakob Penner, Hassan Kamleh, Reiner Vianden in Hyperfine Interactions (2010)

  8. No Access

    Article

    Angular correlation studies on 172Lu(172Yb) in GaN and measurements at low temperatures

    For optoelectronic devices semiconductors with large band gap doped with rare earth are used. Do** is generally performed during growth but for more structured do** the ion implantation technique is prefer...

    Riccardo Valentini, Reiner Vianden in Hyperfine Interactions (2010)

  9. No Access

    Article

    Doped silicon under uniaxial tensile strain investigated by PAC

    The recent application of strained silicon into transistor design has led to significant progress in increasing the performance of devices. However, up to now little is known about the mechanical behaviour of ...

    Nicole Santen, Reiner Vianden in Journal of Materials Science: Materials in Electronics (2007)

  10. No Access

    Chapter and Conference Paper

    Temperature Dependence of the Quadrupole Interaction for 111In in Sapphire

    Perturbed angular correlation measurements of the hyperfine interaction of 111In in sapphire show, that after implantation and annealing at 1000°C, the fraction of undisturbed probe atoms exhibiting a unique quad...

    Jakob Penner, Reiner Vianden in HFI/NQI 2004 (2005)

  11. No Access

    Article

    Preface

    Reiner Vianden in Hyperfine Interactions (2004)

  12. No Access

    Article

    Temperature Dependence of the Quadrupole Interaction for 111In in Sapphire

    Perturbed angular correlation measurements of the hyperfine interaction of 111In in sapphire show, that after implantation and annealing at 1000°C, the fraction of undisturbed probe atoms exhibiting a unique quad...

    Jakob Penner, Reiner Vianden in Hyperfine Interactions (2004)