ASACUSA collaboration Meeting : Proposal for Run 4 and beyond

Antiprotonic atom x-ray spectroscopy at ASACUSA

3 Apr 2025, 11:05

50m

5th floor (Blackett Laboratory, Imperial College London )

Antiprotonic Atom

Speaker

Dr Nancy Paul (Laboratoire Kastler Brossel (FR))

Description

The PAX project seeks to perform highest precision x-ray spectroscopy of Rydberg states in antiprotonic atoms in order to study strong-field QED effects in a region heretofore unexplored [1]. The project is based on the confluence of low-energy antiproton beams at ELENA, and newly available Transition Edge Sensor (TES) microcalorimeter detectors that allow for 10E-4 intrinsic energy resolution in the ~100 keV regime, while maintaining high quantum efficiency [2].

I will present an overview of the PAX project, current status, and prospects for integrating the final experimental setup that includes a few mbar gas cell and large solid angle TES detector into the ASACUSA1 beamline.

[1] N. Paul et al, PRL 126, 173001 (2021)
[2] G. Baptista et al, arXiv:2501.08893 (2025)