[sém. doct] Yinghao Xi, "Position sensitive ultracold neuton detectors"

Wednesday 4 Apr 2018, 10:00 → 10:30 Europe/Paris

Yinghao Xi, "Position sensitive ultracold neuton detectors", An ultracold neutron (UCN, E<200 neV) bouncing over a flat surface is a case of a 1D quantum well, where the vertical energy of the neutron is quantized. The energy levels are a few pico-electronvolts and the spatial extension of the wavefunction is around 10 µm. The characterization of this system allows further understanding of quantum mechanics in the presence of a gravitational potential. The GRANIT project at Institut Laue-Langevin aims at this characterization and requires several position sensitive UCN detectors instead of standard counting detectors. In this talk, the two detector projects under development will be presented. The first project concerning a submillimetric resolution detector combines a thin conversion layer of 10B with ZnS(Ag) scintillator, and the second project aiming at a micrometer resolution detector uses CCD sensors and 10B conversion layer. The thin-film deposition is achieved by PVD plasma technology developed at LPSC/CRPMN.