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- Title
DATA ANALYSIS AND EVENT IDENTIFICATION OF THE γ + n → π<sup>-</sup> + p REACTION.
- Authors
MANDAGLIO, G.; MANGANARO, M.; GIARDINA, G.; DI SALVO, R.; FANTINI, A.; D'ANGELO, A.; FRANCO, D.; MORICCIANI, D.; SANDRI, P. LEVI; SCHAERF, C.; VEGNA, V.
- Abstract
We present the selection method of events originating from the γ + n → π- + p reaction obtained by bombarding a liquid deuterium target with a polarised γ beam of 0.6-1.5 GeV in the framework of the Graal experiment. We show the effect of bi-dimensional cuts (obtained combining measured quantity and reconstructed kinematic variables) and hardware constraints in order to reduce the contamination coming from the concurrent reaction channels. We describe a new three-dimensional cut based on the Fermi momentum reconstruction able to obtain a great increase of the signal/noise ratio. We determine the reaction vertex by using the precise measurement coming from the multi-wire proportional chambers (MWPCs) detectors: in this way we can reconstruct the shape of the spatial distribution of the beam and its position with respect to the target. By the simulation we estimate the contamination degree due to the other reaction channels so we can test the reliability of our method.
- Subjects
DEUTERIUM; GAMMA rays; HYDROGEN isotopes; SIGNAL-to-noise ratio; DETECTORS
- Publication
Acta Physica Polonica B, 2010, Vol 41, Issue 2, p399
- ISSN
0587-4254
- Publication type
Article