Charged pion photoproduction from light nuclei
The photoproduction of 0--150-MeV charged pions from light nuclei is studied from a distorted wave impulse approximation (DWIA) approach. The final nuclear states are restricted to a finite set of isospin analogs of excited states of the target nucleus. The final state interactions of the pion with residual nucleus are incorporated via optical potentials. The elementary photoproduction operator used is that of Blomqvist and Laget which is derived in a general reference frame. To gain insight into the predictive power of this DWIA approach, total and differential cross sections for ..pi../sup + -/ from /sup 6/Li, /sup 7/Li, /sup 10/B, /sup 12/C, and /sup 14/N are calculated and compared with available data. It is found that, with a few exceptions, reasonable agreement is obtained between theory and experiment as long as the nuclear wave functions are constrained to fit other electromagnetic and weak processes and the optical potentials are constrained to fit pion-nucleus elastic scattering data. We conclude that, in this stage, using the Blomqvist--Laget operator in a DWIA calculation adequately describes the dynamics of charged pion photoproduction from complex nuclei. We illustrate how this reaction can be used to obtain information on the short range nature of the pion wave function and on nuclear wave functions. Shortcomings of and improvements on this caluculation are also suggested.
- Research Organization:
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
- OSTI ID:
- 6005591
- Journal Information:
- Ann. Phys. (N.Y.); (United States), Journal Name: Ann. Phys. (N.Y.); (United States) Vol. 135:1; ISSN APNYA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=6-19
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
BORON 10 TARGET
BOSONS
CARBON 12 TARGET
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
FUNCTIONS
HADRONS
IMPULSE APPROXIMATION
INFORMATION
INTERACTIONS
ISOBARIC ANALOGS
LITHIUM 6 TARGET
LITHIUM 7 TARGET
MESONS
NITROGEN 14 TARGET
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
TARGETS
THEORETICAL DATA
TOTAL CROSS SECTIONS
WAVE FUNCTIONS