Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 72: Poster
HK 72.17: Poster
Donnerstag, 14. März 2024, 17:15–18:45, HBR 14: Foyer
Experimental setup for the investigation of the internal conversion lifetime of 229mTh in a solid state environment using VUV sensitive SiPMs — •Daniel Moritz1, Lilli Löbell1, Georg Holthoff1, Mahmood Hussain1, Tamila Rozibakieva1, Kevin Scharl1, Benedict Seiferle1, Markus Wiesinger1, Lars von der Wense2, and Peter G. Thirolf1 — 1Ludwig Maximilians Universität München — 2Johannes Gutenberg Universität Mainz
With its exceptionally low energy of the isomeric first excited nuclear state (8.334±0.024 eV), 229mTh is in the focus of current research as the presently only suitable candidate to be used as the basis for building a nuclear clock. One of the isomer’s properties investigated is the lifetime of neutral 229mTh atoms for which the decay from the isomer to the ground state is dominated by the internal conversion (IC) decay channel. So far, the internal conversion lifetime has only been measured on metallic surfaces and first hints on its dependence on the electronic environment of 229mTh have been obtained. Given that their entrance window dead layer is thin enough, VUV sensitive silicon photo multipliers (VUV SiPMs) provide the opportunity of implanting 229mTh atoms into their depletion region where IC electrons can be detected, thus offering a possible way to investigate the IC lifetime within a solid state environment. To assure sufficient thickness, the dead layers of the VUV SiPMs need to be further reduced by etching. This poster presents the experimental setup at LMU as well as the corresponding etching treatments. This work was supported by the ERC Synergy Grant "ThoriumNuclearClock".