Photoabsorption off nuclei with self-consistent vertex corrections

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.024902· OSTI ID:21290071

Riek, F; Lutz, M F. M.; Korpa, C L ^[1]

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1. Gesellschaft fuer Schwerionenforschung (GSI), Planck Strasse 1, D-64291 Darmstadt (Germany)

We study photoproduction off nuclei based on a self-consistent and covariant many-body approach for the pion and isobar propagation in infinite nuclear matter. For the first time the t-channel exchange of an in-medium pion is evaluated in the presence of vertex correction effects consistently. In particular the interference pattern with the s-channel in-medium nucleon and isobar exchange contribution is considered. Electromagnetic gauge invariance is kept as a consequence of various Ward identities obeyed by the computation. Adjusting the set of Migdal parameters to the data set we predict an attractive mass shift for the isobar of about 50 MeV at nuclear saturation density.

• OSTI ID: 21290071
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 2; Other Information: DOI: 10.1103/PhysRevC.80.024902; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CORRECTIONS
DENSITY
GAUGE INVARIANCE
INTERFERENCE
MANY-BODY PROBLEM
MASS
MEV RANGE 10-100
NUCLEAR MATTER
NUCLEI
NUCLEONS
PHOTOPRODUCTION
PIONS
S CHANNEL
SATURATION
T CHANNEL
WARD IDENTITY