Role of Gamow-Teller suppression and M1 radiative widths on. pi. /sup -/ photoproduction from /sup 14/N
Total and differential cross sections are presented for the reaction /sup 14/N(..gamma..,..pi../sup -/)/sup 14/O/sub g.s./ for 0 --200 MeV pions, using the Blomqvist-Laget photoproduction operator and including all requisite pion distorted waves. It is found that phenomenological p-shell wave functions obtained from fits to inelastic electron scattering data from /sup 14/N, when used in the photoproduction calculation, give good agreement with experiment. This agreement is a result of using nuclear wave functions that not only suppress the Gamow-Teller matrix element but also agree with M1 radiative widths. As in the photoproduction of pions off other light nuclei, the total cross section shows a peak at energies far below the (3, 3) resonance energy, which arises from the recoil nuclei being constrained to discrete final states. As a result of the suppression of the Gamow-Teller matrix element for this transition, the reaction is sensitive (even at threshold) to the higher order terms in the photoproduction operator and hence to the curvature of the pion waves and the Fermi motion of the nucleons in the nuclei. This suggests that this reaction provides a sensitive probe of pion distortions and of the Ericson-Ericson effect.
- Research Organization:
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
- OSTI ID:
- 5554020
- Journal Information:
- Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:3; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
CARBON 12 TARGET
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FUNCTIONS
GAMOW-TELLER RULES
HADRONS
INTERACTIONS
ISOTOPES
LIGHT NUCLEI
M1-TRANSITIONS
MATRIX ELEMENTS
MESONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NITROGEN 12
NITROGEN 14 TARGET
NITROGEN ISOTOPES
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
ODD-ODD NUCLEI
OXYGEN 14
OXYGEN ISOTOPES
P STATES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
PSEUDOSCALAR MESONS
RADIOISOTOPES
RECOILS
SECONDS LIVING RADIOISOTOPES
TARGETS
TOTAL CROSS SECTIONS
WAVE FUNCTIONS