München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Instrumentation VII and Applications

HK 31.4: Vortrag

Dienstag, 19. März 2019, 17:30–17:45, HS 12

Development of a HPGe-BGO Pair Spectrometer for ELI-NP — •Ilja Homm, Alexander Ignatov, Stoyanka Ilieva, and Thorsten Kröll — Technische Universität Darmstadt

At the moment, the new european research facility called ELI-NP (The Extreme Light Infrastructure - Nuclear Physics) is being built in Bucharest-Magurele, Romania. ELI-NP offers unprecedented opportunities for photonuclear reactions with high intensity, brilliant and fully polarized photon beams at energies up to 19.5 MeV.

The 8 HPGe CLOVER detectors of ELIADE are important instruments for the gamma spectroscopic study of photonuclear reactions. We investigate the possibility to operate an advanced version of an anti-Compton shield (AC shield) as escape γ-rays pair spectrometer for one of the ELIADE CLOVERS to extend the high-resolution spectroscopy to photon energies of several MeV where the pair production process dominates. The BGO shield operated as a stand-alone device can also be used as intensity monitor and to investigate the cross section for pair production near the threshold. The main tasks are to develop and test such an AC shield: a pair spectrometer consisting of BGO crystals with SiPM (silicon photomultiplier) readout. The results of prototype testing are reported. First measurements with low energy photons are planned for 2019.
This work is supported by the LOEWE-Forschungsschwerpunkt “Nukleare Photonik”.