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Radiative Pion Capture in Flight and Charged Pion Photoproduction in Nuclei

Publication: Canadian Journal of Physics
August 1974

Abstract

Differential and total cross sections are calculated for charged pion photoproduction and radiative pion capture in flight close to threshold , mainly for a target of 12C. At the lower energies, selective bound state excitation may be studied in photo-production since the giant resonance is kinematically suppressed here. Pion absorption is found to increase considerably with decreasing pion energy due to a 1/νπ factor, and it shows a dip in the forward direction except for the 1+ state. Distortion and absorption effects on the pion are calculated, and are estimated to lead to only a small reduction of the cross section in the energy region considered.

Résumé

On a calculé les sections efficaces différentielles et totales de photoproduction de pions chargés et de capture radiative de pions en vol, dans le voisinage du seuil , principalement pour une cible de 12C. Aux plus basses énergies, il est possible d'étudier l'excitation sélective d'états liés dans la photoproduction, étant donné que la résonance géante se trouve supprimée cinématiquement. On trouve que l'absorption des pions augmente considérablement lorsque l'énergie des pions diminue, à cause d'un facteur 1/νπ, et que la distribution angulaire présente un creux pour la direction avant, sauf dans le cas de l'état 1+. Les effets de distorsion et d'absorption sur le pion sont calculés, et on peut estimer qu'ils ne conduisent qu'à une faible réduction de la section efficace dans la région d'énergie considérée. [Traduit par le journal]

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cover image Canadian Journal of Physics
Canadian Journal of Physics
Volume 52Number 15August 1974
Pages: 1405 - 1415

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Version of record online: 5 September 2011

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F. Cannata
Department of Physics, The Catholic University of America, Washington, D.C. 20017
B. A. Lamers
Department of Physics, The Catholic University of America, Washington, D.C. 20017
C. W. Lucas
Department of Physics, The Catholic University of America, Washington, D.C. 20017
A. Nagl
Department of Physics, The Catholic University of America, Washington, D.C. 20017
H. Überall
Department of Physics, The Catholic University of America, Washington, D.C. 20017
C. Werntz
Department of Physics, The Catholic University of America, Washington, D.C. 20017
F. J. Kelly
U.S. Naval Research Laboratory, Washington, D.C. 20375

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Cited by

1. Photoproduction of pseudoscalar mesons on 1p -shell nuclei at high energies and forward angles
2. Charge number dependence of π+ production from nuclei by 200 MeV electron
3. Photoproduction of charged pions to discrete nuclear states
4. Coherent π0 photoproduction near threshold on closed-shell nuclei
5. Electroproduction of π+ from 12C leading to low-lying residual states in 12B
6. Study of Strong Spin-Isospin Mode Analog States at 4.5 MeV in B12 in C12(e, e′π+)B12
7. Electroproduction of Charged Pions from C12 Leading to Discrete Final Nuclear States
8. Positive-pion photoproduction on C12 near threshold
9. Charged Pion Spectroscopy
10. Study on the Low-Lying States Via the Photopion Production on Several Nuclei
11. Photopion Physics — An Experimental Overview
12. Inverse pion photoproduction
13. C12(e, e′π+) Reaction Leading to Low-Lying States in B12
14. The 12C(e, e'  +)12B Reaction near the Threshold
15. Inelastic neutrino reactions on 16O
16. Electroproduction and photoproduction of charged pions on Al27 and V51 at intermediate energies
17. Radiative Pion Capture in Nuclei
18. Radiative Pion Capture and Charged Photo-Pion Production in the Threshold Region
19. Electroexcitation of the T0+1 giant M1 resonance in Ni58,60
20. Final state interactions in nuclear pion photoproduction over the (3, 3) resonance
21. Distorted-wave approximation and nuclear correlations in pion reactions
22. Nuclear electroproduction of negative pions below threshold

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