By Edoardo Amaldi, U. Fano, L. V. Spencer, M. J. Berger
661 tures, corresponding to happens in stellar atmospheres and in thermonuc1ear techniques, aren't thought of 1. simply because photoelectric absorption predominates thoroughly at low photon energies, and penetration thought is simple below those stipulations, consciousness is directed during this artic1e to photon energies above ""20 kev. at the excessive strength part, this artic1e doesn't hide the cascade bathe procedures that are dealt 2 with in cosmic ray experiences • during this connection it really is recalled that the cascade bathe technique, which includes electrons and positrons along with X rays, turns into fundamental above 10 Mev in heavy components, and above a hundred Mev in gentle ones. Theories constructed for the learn of cascade showers in cosmic rays depend on assumptions in regards to the prob skill of interactions with subject that are sufficient in simple terms at energies of the order of one Gev or extra. under this power there's a hole during which penetration phenomena are qualitatively recognized and understood yet haven't but been calculated intimately. a number of particular experimental stories which were made at energies as much as three hundred Mev should be reviewed during this article.
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Extra resources for Neutrons and Related Gamma Ray Problems / Neutronen und Verwandte Gammastrahlprobleme
23) 1~0 In the case of slow neutrons, in which only S waves are considered, the numerical factor T(E,) is simply (1 -[170[2), and therefore it is always smaller than 1; in certain cases, however, it is smaller than 1 by not too many orders of magnitude (Sect. 15). 19. The case of maximum possible absorption. The example of fast neutrons colliding against large black nudeL In this section we shall discuss the extreme case of nuclei showing the maximum possible absorption. 13) this situation is attained, for the l-th partial cross section, when 171 = O.
136, 951 (1935). 'L. FERMI and E. AMALDI: Rie. sei. 6 (2) 443 (1935). 5 O. R. FRISCH, G. HEVESY and H. A. C. McKAY: Nature, Lond. 137, 149 (1936). 44 EDOARDO AMALDI: The Produetion and Slowing Down of Neutrons. 24. consider group C. From the simple fact that a velocity distribution roughly Maxwellian was obtained using the velocity selector described in Sect. 23, in which the selection of neutrons is done by means of Cd absorbers, one can conc1ude 1 that the spectral interval strongly absorbed in Cd covers, at least in part, the thermal energy region.
In this connection, we must mention a mechanical experiment, different from those described in Sect. 23, done at Columbia Universityl, in order to directly verify the 1/v law in Cd, Ag and B. 1) is independent of the relative velo city v, of the neutron and the nucleus. Therefore one can verify this law by making use of an absorber which moves with a velo city V not negligible with respect to the velocity v of thermal agitation of the neutrons, so that the relative velocity v,=v+ V can be changed at will, by changing V.