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MODEL DEPENDENT ESTIMATION.
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REAL/IMAG OF FORWARD AMPLITUDE FROM FIT TO D(SIG)/DT.
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THE AVERAGE PHASE IS -130.9 +- 2.7 DEG (NO EXPLICIT MOMENTUM DEPENDENCE). USING ABS(ETA+-) = 2.3*10**-3.
REGENERATION AMPLITUDE ASSUMING MOMENTUM INDEPENDENT CONSTANT PHASE.
CROSS SECTION DIFFERENCES ASSUMING MOMENTUM INDEPENDENT CONSTANT PHASE.
The differential cross section of Delbr\"{u}ck scattering is measured on a bismuth germanate $Bi_4Ge_3O_{12}$ target at photon energies $140 - 450 MeV$ and scattering angles $2.6 - 16.6 mrad$. A good agreement with the theoretical results, obtained exactly in a Coulomb field, is found.
Axis error includes +- 1.5/1.5 contribution (Error of measurement of the initial photons intensity).
The absolute differential cross sections of 17.9 GeV/$c$ $\alpha$-particles scattering on nuclear targets have been measured over a four momentum transfer range of $0.009
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Измерено сечение упругого рассеяния фотонов на if-ме- зонах в области S, = (6,5 ± 0,5)1? и &™ = 13(Р ± 3(Р. Из подученных экспериментальных данных определена поляризу емость п-мезона а^+ = (20 ± 12)- Iff*3 см 3
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X ERROR D(THETA) =0.5000MRAD AND D(P)/P = 0.700PCT.
X ERROR D(THETA) =0.5000MRAD AND D(P)/P = 0.700PCT.
X ERROR D(THETA) =0.5000MRAD AND D(P)/P = 0.700PCT.