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Search for Electrons in the Primary Cosmic Radiation

curve which is roughly exponential in form when plotted as a function of the aluminum absorber thickness. The coincidence rate reaches zero at 0.0235 g/cm2, suggesting a maximum conversion electron energy of 0.135 Mev. It has been shown that tantalum (182) emits about sixteen con- verted gamma-rays.2 (N#/N#)/(Ny/NN,) at zero absorber thickness was found to be correspondingly large, about 0.7, and since the relative values of the individual con- version coefficients are not known, the total conversion coefficient could not be calculated.3 Beta-beta coincidences in the disintegration of Ir'92 have been reinvestigated.3 The beta-beta coincidences per beta- ray are shown in Fig. 2 as a function of aluminum absorber thickness. The beta-beta and beta-gamma coincidence rates were extrapolated to zero absorber thickness on a semilogarithmic plot, and the total conversion coefficient was found to be 3213 percent, in agreement with the previous estimate.2 Several different geometric arrange- ments were employed with 'extremely thin sources of radioactive iridium, and all of the curves were similar in form to that of Fig. 2. The maximum obtained in the region of low energy by Wiedenbeck and Chu3 was not observed. Thus far, beta-beta coincidences have been measured in Ta'82, Ir'12, Os'91, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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