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

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

ISBN-10: 147570139X

ISBN-13: 9781475701395

ISBN-10: 1475701411

ISBN-13: 9781475701418

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The changes in this circuit consisted mainly in an increase in the anticoincidence efficiency. For this purpose. the suppressing pulses. which arrive at the pentode grid of the "anticoincidence" 6Zh2P tube (Fig. 19). were shaped by a low-threshold. high-speed trigger circuit. The latter provided a stable suppressing pulse with a base length of 3 . 10-7 sec. A similar shaping stage at the output of the telescope circuit increased the counting rate from one telescope to 5 . 106 counts/ sec. In addition.

The experimentally established asymmetry in 1I"°-meson emission in the reaction y + P _ P + 11"0 [45] definitely indicates an appreciable value for the amplitude But even in the extreme case Eo+ = 0, no Fff;. Fff:. '" See previous footnote. 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.

Since a lead converter one t-unit thick was placed between counters land II, this arrangement secured the detection of photons agronst the background of charged particles. The output signal from the }-telescope was delivered to a multichannel time analyzer. Each channel of the analyzer corresponded to a change 6'Kmax = 8 MeV in the maximum of the bremsstrahlung spectrum. The decay y-quantum yield was measured simultaneously for five intervals of primary photon energy between 170 and 210 MeV. 24 A.

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Photomesic and Photonuclear Processes: Proceedings (Trudy) of the P. N. Lebedev Physics Institute by A. I. Lebedev, E. I. Tamm (auth.), Academican D. V. Skobel’tsyn (eds.)


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