https://doi.org/10.1140/epja/s10050-023-01152-y
Regular Article – Experimental Physics
The Gerasimov-Drell-Hearn sum rule with nuclear targets
1
Kitzbühel Centre for Physics, Kitzbühel, Austria
2
Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
3
INFN-Sezione di Pavia, Pavia, Italy
4
Institut für Kernphysik, University of Mainz, Mainz, Germany
Received:
6
August
2023
Accepted:
1
October
2023
Published online:
23
October
2023
Hadron properties are modified when the hadron is embedded in a nuclear medium. Here we discuss the Gerasimov-Drell-Hearn, GDH, sum rule for polarised photoproduction from a polarised nucleon within a polarised nuclear target. Strong enhancement is expected with the suppression of the proton and nucleon resonance masses and enhancement of the proton’s anomalous magnetic moment in medium. This could be tested in polarised photoproduction experiments with interesting targets being polarised deuterons, 
He, 
Li and 
Li. The largest contribution to the GDH sum rule comes from the 
resonance excitation. In existing data with polarised deuterons and He the excitation is shifted to slightly lower energy when compared to model predictions where the is treated with its free mass.
© The Author(s) 2023
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