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The forward asymmetry in the differential cross section for the photo disintegration of the deuteron has been calculated on the basis of a phenomenological theory for energies up to 80 MeV. The formulas for this asymmetry, which come from theE1-E2-andM1-M2-interference, are given, assuming the validity ofSiegert's theorem. TheE2-andM2-amplitudes are calculated approximately, using the Hulthén wavefunction with a 4% D-state admixture for the ground state and scattered waves determined by the phase shifts given by Marshak for the final states. The contribution of theM1-M2-interference turns out to be unimportant for the asymmetry, theE1-E2-interference giving the main effect. In the differential cross section,dσ/dΩ=a + b sin 2 ? + c cos ? + d cos ? sin 2 ?, we have obtained a very low value forc and the ratioc/d is approximately equal toa/3b. This is in contradiction to the assumptionc/d=a/b made in the previous analysis of the experimental data. This ratio seems to be insensitive to the value of the D-state admixture. For the lover energiesE γ=10 MeV andE γ=20 MeV the theoretical values for “d” are in agreement with the experimental ones. For the energies 54 and 80 MeV we have made a comparison of the theoretical differential cross sectiondσ/dΩ, taking into account the values for “a” and “b”, obtained in a former work ie, with the measureddσ/dΩ. 相似文献
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《Solid State Ionics》1987,23(3):235-239
Solid electrolyte potentiometry can be a valuable tool in heterogeneous catalysis. Its applicability is restricted by the existence of a low temperature limit. The study of different pretreatments of the electrodes shows that, in the case of the cell Pt/ZrO2 (Y2O3)/Pt, this limit is due to the electrochemical reaction itself. Therefore the preparation should aim at a maximum value of the three phase boundary-line gas-electrode-electrolyte to enable measurements in a catalytically interesting temperature domain. 相似文献