Speaker
Description
In this presentation, a new measurement of the monopole transition form factor of the ground state to the first exited state of the alpha-particle will be presented [1]. The precision of the measurement exceeds significant the precision of existing data sets and allows for the determination of two coefficients in a low energy expansion.
The result are confronted with state-of-the art theoretical calculations including modern nuclear forces, which nevertheless fail to reproduce the data by a factor of about two.
In the outlook, the few body program at the MAGIX experiment at the new MESA accelerator will be presented. This experiment will be optimized to measure the low energy excitation of light gas targets with high resolution spectrometers using the high beam current of an energy recovery linac.
[1] Phys. Rev. Lett. 130, 152502 (2023)
