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O: Fachverband Oberflächenphysik

O 37: Poster: Electronic Structure of Surfaces and Spectroscopy of Surface States

O 37.2: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster D

A New Setup for the Measurement of the Angular Correlation of Annihilation Radiation — •Kilian Brenner, Francesco Guatieri, and Christoph Hugenschmidt — Lichtenbergstr. 1 85748 Garching

The measurement of the Angular Correlation of positron Annihilation Radiation (ACAR) provides an elegant solution to investigate Fermi-surfaces. The present ACAR spectrometer at TUM uses Anger cameras basically comprising large NaI(TL) crystals read out by an array of 61 photomultiplier tubes. In our new setup, we employ pixelated LYSO scintillation crystals in combination with state-of-the-art Multi-Photon-Pixel-Counters (MPPCs), drastically improving momentum resolution and count rate by capitalizing on the smaller detector-element size and faster readout. We present the new setup, its capabilities and preliminary measurements.

Keywords: positron; acar; nepomuc; mppc; lyso