| Issue |
EPJ Web Conf.
Volume 164, 2017
5th International Conference on New Frontiers in Physics
|
|
|---|---|---|
| Article Number | 07034 | |
| Number of page(s) | 8 | |
| Section | Parallel | |
| DOI | https://doi.org/10.1051/epjconf/201716407034 | |
| Published online | 05 December 2017 | |
https://doi.org/10.1051/epjconf/201716407034
Recent results on doubly-polarised pion photoproduction and the GDH sum rule on the nucleon at MAMI
1
Dipartimento di Fisica, Università degli Studi di Pavia, I-27100 Pavia, Italy
2
INFN, Sezione di Pavia, I-27100 Pavia, Italy
a e-mail: susanna.costanza@pv.infn.it
Published online: 5 December 2017
New measurements of the helicity dependence of the total inclusive photoabsorption cross section and of the partial cross sections for several reaction channels on the proton and on the neutron were carried out at MAMI (Mainz) in the energy region 200 < Eγ < 1500 MeV. The experiments were performed at the tagged photon beam facility of the MAMI accelerator in Mainz, using circularly and longitudinally polarised photons on longitudinally polarised proton, deuteron and 3He targets.
These new doubly-polarised pion-photoproduction data sets give new input to the partial wave analyses and allow to constrain the multipole solution of the different analyses; they also allow to study the double-polarisation observables G and E. Furthermore, the results obtained give information on the well-known Gerasimov-Drell-Hearn sum rule.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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