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Large angle scattering of fast μ -mesons by an iron plate, 6 cm thick, has been investigated by means of a counter-hodoscope which recorded separately two energy bands: from 200 Mev to 320 Mev kinetic energy, and from 320 Mev to infinity. About half a million incident μ -mesons were counted....
A study has been made of the feasibility of accurate numerical determinations of the transmission of gamma-rays through large thicknesses of materials. The first procedure investigated consists in regarding the total probability of photon transmission, N t , as the sum of the probabilities N n ,...
An attempt has been made to determine the shape of the U 238 photo-fission cross section up to a gammaray energy of 22 Mev by an analysis of the excitation function obtained by varying the peak energy of the bremsstrahlung from a 22-Mev betatron. A resonance for the photo-fission process is...
Separated stable isotopes of Ni have been used to assign a 67-kev maximum energy beta-emitter which decays with an 85-yr half-life to Ni 63 . Ni 59 was found to decay by K electron capture with a half-life of 7.5× 10 4 yrs.
Relative cross sections for the photo-fission of several fissionable elements have been measured using a "catcher" method. The results indicate the following cross sections with respect to U 238 : U 233 , 2.49; U 235 , 1.49; Pu 239 , 2.51; Th 232 , 0.257; and Io 230 , 0.847.
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