Photoproduction ofK + Λ andK +*∑0 from hydrogen between 1.3 and 1.45 GeV
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Cross sections for vibrationally elastic scattering of the system e-C2H6 have been measured with a newly constructed apparatus of the crossed-beam type using the relative flow technique. Absolute elastic differential cross sections for C2H6 were obtained by measuring the ratios to the cross section for He at impact energies of 2, 3, 4, 5, 6, 7.5, 8.5, 10, 15, 20, 40 and 100 eV and angles from 15' to 130'. Integral and momentum transfer cross sections were calculated from the DCS and are compared with other measurements. A short description of the apparatus is given.
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We have performed Doppler measurement of the differential cross-section of the reactive collision F + I2 → IF + I. With this technique, we have been able to study the differential cross-section as a function of the internal state of IF. The shape of this differential cross-section appears to depend strongly on the rotational energy of IF. This is the first observation of such a dependence for which we present tentative explanations.
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The differential scattering cross section measurements for selected energies between 2 and 19 eV have been re-analysed to obtain phaseshifts and associated errors which are consistent with the measurements. The phaseshifts obtained from different angular distribution measurements are shown to be consistent with each other within their associated errors and are also consistent with the best available phaseshifts determined by theory. These phaseshifts have also been used to determine total and momentum transfer cross sections which are compared with direct determinations of these quantities. The re-analysis of the differential cross section measurements does not reduce the uncertainty which at present exists in the total cross section at lower energies.
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Differential cross section measurement of η photoproduction on the proton from threshold to 1100 MeV
The differential cross section for the reaction p(γ,ηp) has been measured from threshold to 1100 MeV photon laboratory energy. For the first time, the region of the S11(1535) resonance is fully covered in a photoproduction experiment and will allow a precise extraction of its parameters at the photon point. These high precision data together with the already measured beam asymmetry data will provide stringent constraints on the extraction of new couplings of baryon resonances to the η meson.
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