By A. B. Kurepin (auth.), Academician D. V. Skobel’tsyn (eds.)
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Example text
Root. To obtain the final experimental error, the following further uncertainties belonging to the second group must be added: 1. 8"/o). 2. Error in the calibration of the Huygens manometer (Jess than 0. 3"/o). 3. l"lo). 4. Uncertainty in the correction representing the reduction in the detection efficiency due to multiple scattering in the gas and counter window at low energies (for an inadequate resolution of the peaks) (up to 5"/o), 5. ;}, The correctness of the estimated errors in the first group can be established by comparing the values of for individual measurements with the root-mean-square errors of individual measurements obtained from the analysis of the data.
A reaction proceeding through the singlet state affects only the singlet s phase, while that proceeding through the triplet phase affects only the triplet s phase. - a,- D cos 0, 4:rt&a- = 2kgR cos sX,. - (2kofl sin s + 1) Y,. - B cos 0, (9) where &a+ =a+ - a 0 , &a- = a- - ao, + X,. = 1a, cos 2160 Y,. = 1a, sin 216 0 + 2360 , 3a, cos 3a, sin 236 0, where o 0 is the elastic cross section in the center-of-mass system forE= Eth; o+ and o- are the elastic cross sections for Eth ± b. E taken so that the reverse reaction follows the 1/ v law, ko is the wave vector of the scattered particles (proton and triton) for a center-of-mass energy E = Eth, 1c5 0 and 3c5 0 are the s phases for scattering in the singlet and triplet states at E = Eth, and D and B can be expressed in terms of s and p phases, the partial reaction cross sections, and the Coulomb phase shift.
It was shown, however, that a change in the singlets phase has little effect on the remaining parameters. All the phases are found to mate well at the reaction threshold. The triplet p phase increases with energy and the singlet p phase becomes negative. The small contribution of spin-orbital splitting is indicated also by polarization measurements on protons scattered by tritium performed by Skakum eta]. 5 MeV and angles at 40' and 60'. They showed that the polarization was quite small, but the measurements were of poor accuracy.