Conveners
Analytics, Positrons and Imaging (API)
- Nikolay Kardjilov (Helmholtz-Zentrum Berlin)
Analytics, Positrons and Imaging (API)
- Nikolay Kardjilov (Helmholtz-Zentrum Berlin)
Analytics, Positrons and Imaging (API)
- Nikolay Kardjilov (Helmholtz-Zentrum Berlin)
The outstanding transmission characteristics of the neutron combined with its magnetic moment render it a unique probe for the determination of magnetic properties of bulk ferromagnetic materials. While neutron scattering techniques probe magnetism from an atomic length scale up to a few 100 nm, neutron imaging has been shown to provide complementary information from macroscopic length scales...
Prompt Gamma Activation Imaging (PGAI) is based on the narrow collimation of the neutron beam to, and of the gamma rays emitted from predefined spots of complex objects. We plan to reduce the long scanning time using a detector cluster consisting of seven HPGe detectors each of which would observe one voxel each along the line activated by the neutron beam also applying multiple collimator...
The major reaction of fast neutrons at NECTAR is inelastic scattering, in which a lower-energy neutron and a medium-energy gamma photon is produced. The gamma rays are characteristic, i.e. they identify the emitter nuclide. Using the coincidence detection of these particles, elemental or isotope mapping of complex samples would be possible. Based on this approach, we propose an upgrade to the...
Electrochemical storage systems, such as lithium batteries and fuel cells, have become an increasingly important pillar in a zero-carbon strategy for curbing climate change, with their potential to power multiscale stationary and mobile applications. Immense progress has been made in electrochemical storage technology during the past decades, but significant challenges remain and new...
The Coincidence Doppler Broadening (CDB) spectrometer with its monoenergetic scanning positron beam allows the investigation of defect distributions in three dimensions (3D) and the elemental surrounding of open-volume defects. With our instrument we address the following scientific questions:
- Homogeneity of samples, i.e. depth and lateral distribution of lattice defects. Examples are...
Tailoring properties of structural and functional materials is strongly based on atomic defect analysis. Occurrence of these defects is in most cases associated with open volume for which positrons are an ideal and specific probe, e.g., by applying energy spectroscopy of the Doppler broadening of the two gamma photons of the positron-electron annihilation in general and in coincidence (CDB)....
