Article

Helicity dependence of gamma p → N pi below 450 MeV and contribution to the Gerasimov-Drell-Hearn sum rule

DOI:http://eprints.gla.ac.uk/1288/
Source: OAI

ABSTRACT The helicity dependence of the single pion photoproduction on the proton has been measured in the energy range from 200 to 450 MeV for the first time. The experiment, performed at the Mainz microtron MAMI, used a 4 pi-detector system, a circularly polarized, tagged photon beam, and a frozen-spin target. The data obtained provide new information for multipole analyses of pion photoproduction and determine the main contributions to the Gerasimov-Drell-Hearn sum rule and the forward spin polarizability gamma(0).

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Keywords

4 pi-detector system
 
energy range
 
frozen-spin target
 
helicity dependence
 
Mainz microtron MAMI
 
new information
 
spin polarizability gamma(0)