Détecteur à Grande Acceptance pour la Physique Photonucléaire Expérimentale (DAPHNE) | Wikip ...
Channel: wikipedia tts
Date: 2019-05-04

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SUMMARY
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DAPHNE (Détecteur à Grande Acceptance pour la Physique Photonucléaire Expérimentale) was designed by the DAPNIA department of the Commissariat à l'Energie Atomique, in collaboration with the Istituto Nazionale di Fisica Nucleare. The original purpose of the detector was to explore the quantum chromodynamics (QCD) properties of nucleons (i.e. protons and neutrons). To explore these properties, excitation states of the nuclei require to be measured (e.g. Delta baryons, symbol Δ). These excited states of nucleons decay via the emission of light mesons such as pions (π), eta mesons (η) or kaons (K). Various models exist that describe the correlation between the observed reactions, the excited states and QCD.
DAPHNE was built to observe charged light mesons from the decay of excited nucleon states. The excitation of nuclei can be done with either pion scattering, or real photon scattering on the nucleon. Real photon scattering has the advantage that the first vertex can be cleanly described by the well known quantum electrodynamics (QED), while for the pion scattering at least two strong interaction vertices exist that require much more effort from models.
The detector was used by the Commissariat à l'Énergie Atomique in– Saclay, France (accelerator SATURNE, 19871990) and the Institut für Kernphysik in Mainz, Germany (accelerator MAMI, 1990–2003).