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Daniel Unger
QUP Postdoctoral Fellow
e-maildaniel.unger-at-kek.jp
I am an experimental physicist developing low-temperature X-ray detectors for precision spectroscopy of exotic atoms. I received my Ph.D. from Heidelberg University, where I developed and deployed the first Magnetic Microcalorimeter (MMC) array for muonic-atom spectroscopy. Within the QUARTET collaboration, we measured the X-ray spectra of muonic lithium, beryllium and boron at the Paul Scherrer Institute. At QUP, I combine beamline experiments with detector development to push the accuracy of exotic-atom X-ray spectroscopy further.
Research Content
As a member of the HEATES and PAX collaborations, I contribute to high-resolution X-ray spectroscopy of muonic atoms at J-PARC and antiprotonic atoms at CERN using Transition-Edge Sensor (TES) arrays developed by NIST. These measurements probe nuclear structure, bound-state QED in strong fields and QCD.
In parallel, I am developing Self-Compensating MMC (SC-MMC) arrays. At accelerators, the charged-particle background heats the detector and shifts its gain. An SC-MMC is designed so that its gain does not change with temperature. A detector that operates stably at particle beamlines would significantly increase the accuracy of exotic-atom X-ray spectroscopy.
