(γ,pπ) experiments and Δ resonances in nuclei
Creators
- 1. CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Service de Physique Nucleaire a Haute Energie
Description
Real Δ(1236) resonances were excited from the nucleons inside the nucleus to see if the Δ properties were changed due to the medium. The photon is the particle with the smallest momentum transfer for a given excitation and whose interaction with the nuclear medium is so weak as the in-going wave is not deformed before the reaction occurs. Then pion photoproduction is studied with the lightest nuclei: deuterium and helium-4. The most probable mechanism of the reaction is the excitation on quasi-free nucleons. Experimental results were compared with the predictions of model without drawing any possible conclusions. Experimental difficulties appeared with deuterium near 150MeV/c and the anomaly observed in the case of 4He has not yet been explained
Abstract (French)
On a excite des resonances Δ(1236) reelles a partir de nucleons situes a l'interieur d'un noyau pour voir si les proprietes du Δ etaient changees du fait du milieu. Le photon est la particule qui transfere le moins de quantite de mouvement pour une excitation donnee et dont l'interaction avec le milieu nucleaire est suffisamment faible pour que l'onde entrante ne soit pas deformee avant que la reaction n'ait eu lieu. On a etudie la photoproduction de pions sur les noyaux les plus legers: le deuterium et l'helium-4. Le mecanisme de reaction le plus probable est l'excitation de Δ sur les nucleons quasi-libres. Les comparaisons de l'experience aux previsions de ce modele d'ordre zero n'ont pas permis de conclure. Des difficultes experimentales imprevues sont apparues pour le deuterium vers 150MeV/c et l'anomalie observee dans le cas de 4He n'est pas encore expliqueeAdditional details
Additional titles
- Original title (French)
- Les experiences (γ,pπ) et les resonances Δ dans les noyaux
Publishing Information
- Imprint Title
- Mesonic effects in nuclei. Electron scattering at intermediate energies. Rencontres de Saclay, May 12-16, September 8-12, 1975
- Imprint Pagination
- p. 87-96.
- Report number
- CEA-CR--7
Conference
- Title
- Rencontre de Saclay. Mesonic effects in nuclei.
- Dates
- 12 May 1975.
- Place
- Saclay, France.
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 7277587
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- BOUND STATE; CROSS SECTIONS; DELTA-1236 RESONANCES; DEUTERIUM TARGET; GEV RANGE 01-10; HELIUM 4 TARGET; LINEAR MOMENTUM; PHOTONUCLEAR REACTIONS; PHOTOPRODUCTION; PIONS MINUS; PROTONS; RECOILS
- Descriptors DEC
- ANTIMATTER; ANTIMESONS; ANTIPARTICLES; BARYON RESONANCES; BARYONS; BASIC INTERACTIONS; BOSONS; CATIONS; CHARGED PARTICLES; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; INTERACTIONS; IONS; MATTER; MESONS; N*RESONANCES; NUCLEAR REACTIONS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PIONS; PSEUDOSCALAR ANTIMESONS; PSEUDOSCALAR MESONS; RESONANCE PARTICLES; TARGETS
Optional Information
- Notes
- Imprint:Effets mesoniques dans les noyaux. Diffusion d'electrons a energie intermediaire. Rencontres de Saclay, 12-16 mai, 8-12 septembre 1975.