In this presentation at the 54th International Winter Meeting on Nuclear Physics an experiment at MAMI is presented, aimed at providing new measurements of the charge form factor at very small values of the momentum transfer, that could help resolving the problem of the proton charge radius. After the description of the puzzle the data analysis is described and preliminary results are presented. At the end an outlook for further experiments is given.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 30693159In the invited plenary talk the currently best proton radius measurements were summarized, and the importance of the observed inconsistency between the hydrogen and the muonic-hydrogen data was discussed. Selected new experiments dedicated to remeasuring the radius were described, and the results of the MAMI experiment were presented.
B.04 Guest lecture
COBISS.SI-ID: 29412391In the Master thesis the transitions from the ground state to higher energy states in 12C nucleus induced by inelastic electron scattering were studied. Using the measurements collected at the Institute for nuclear physics in Mainz the ratios between differential cross sections for transition into one of the first three excited states and the one for elastic scattering have been determined. With these ratios and by using DREPHA model to determine the values for elastic differential cross section, he was able to obtain differential cross sections and associated form factors for the chosen transitions.
D.10 Educational activities
COBISS.SI-ID: 3000676The discrepancy between the proton charge radius extracted from the muonic hydrogen Lamb shift measurement and the best present value obtained from the elastic scattering experiments, remains unexplained and represents a burning problem of today’s nuclear physics: after more than 50 years of research the radius of a basic constituent of matter is still not understood. This paper presents a summary of the best existing proton radius measurements, followed by an overview of the possible explanations for the observed inconsistency between the hydrogen and the muonic hydrogen data. In the last part the upcoming experiments, dedicated to remeasuring the proton radius, are described.
B.04 Guest lecture
COBISS.SI-ID: 29342503In the paper we first introduce the fundamental constituents of matter and the strong interaction that holds them together. Then we describe the measurement of the deeply virtual Compton scattering on protons, that we performed at the Jefferson Lab’s Hall-A collaboration in the USA, and summarise our findings that were published in the Nature Communications.
F.35 Other
COBISS.SI-ID: 3169380