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POLARIZATION MEASUREMENTS ON THE RECOIL PROTON FROM PION (O) PHOTOPRODUCTION
Lundquist,D ; Allaby,J. V ; Ritson,D. M
1965
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Título:
POLARIZATION MEASUREMENTS ON THE RECOIL PROTON FROM PION (O) PHOTOPRODUCTION
Autor:
Lundquist,D
;
Allaby,J. V
;
Ritson,D. M
Assuntos:
ELASTIC SCATTERING
;
GAMMA PROTON REACTIONS
;
PARITY
;
PIONS
;
POLARIZATION
;
PROTON SCATTERING
Notas:
DTIC AND NTIS
Descrição:
The polarization of the recoil proton in pion(o) photoproduction off hydrogen has been measured for photons in the range 500-1000 MeV, using the Stanford Mark III linear accelerator. Protons were detected at an angle b and momentum analyzed using a 90 degree magnetic spectrometer. The scattered protons were detected by two counter telescopes placed symmetrically to left and right of the carbon target and making angles = C with respect to the direction of a proton emerging from the spectrometer. The measured asymmetry was obtained from the usual formula: e = L-R/L+R and the proton polarization P(b) was then obtained by substituting the known carbon analyzing power A(c) in the equation e(b,c) = (P(b) A(c). Using parity conservation it can be shown that P(b) = -P(b). Thus the running time was equally divided between measurements with the spectrometer at +b and -b. This technique enabled residual artificial asymmetries to be removed, since these do not change sign when b becomes -b. Preliminary results are presented and compared to existing data from various laboratories. (Author)
Data de criação/publicação:
1965
Idioma:
Inglês
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