Photomesic and Photonuclear Processes: Proceedings (Trudy) by A. I. Lebedev, E. I. Tamm (auth.), Academican D. V.

By A. I. Lebedev, E. I. Tamm (auth.), Academican D. V. Skobel’tsyn (eds.)

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Extra info for Photomesic and Photonuclear Processes: Proceedings (Trudy) of the P. N. Lebedev Physics Institute

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Wi) are coefficients which depend on the maximum energy in the leading channel. the maximum energy in the given channel. :::.. Using the experimental values for the yields Y(Wi) and the coefficients BeWm. :::.. :::.. we could calculate the cross section of the investigated process. averaged over the energy interval of the leading channel. The whole procedure could then be repeated for all the intervals (channels). except the leading one. :::.. 6. m -1)' etc. 17). :::.. Wi). For simplicity we confine ourselves to the first two terms T 1\ (x~, m) = M (W 1 m' x [T ~,m ) Y (Tl!

TAMM 30 X=W m ~ )(lim f str (Wm, x) dx. \ ! \ \ I 1\ i i 1\ \ i 1\ where itUm for the leading interv al is determined by the halfwidth of the difference curve of the spectra f str(W m , it) and fstr(Wm-io it) (Fig. 14). For other intervals, ittm = (m - üb.. t Xm' l 'S,m "nfWm Xm-t~J x, MeV itWm - Fig. 14. ,i-k)' The experimental data (see Fig. 13) were treated by the method described above. Table 4 gives the differential yield of decay y-quanta formed in the processes y+d~d(pn)+7T()' and y+p~p+-rrO.

0 2. 7±O. 40). "K = 218 MeV. 10 °, cm2/sr 8 Experiment x = 190 Table 9. OL---'-__--'-__---JL--_ _..... 8y =8/j" 43 quantitative agreement for the cross section of the process Y + p~ P + 7f0 and the ratio dOd/dop can be obtained. This fact, in conjunction with new results of investigation of the process y + p ~ p + 7f0 [54], shows that in the phenomenological analysis of the experimental data other multipole amplitudes, besides the amplitudes Eo+ and Mt+, must be taken into consideration. For instance, a consideration of the magnetic dipole transition to astate with total momentum J = t, if the sign of its amplitude M1 - is the opposite of that of MI +, leads to better agreement with the experimental data.

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