On the Type of Interaction inβ-Decay

Abstract

The cross section in the present experiment is larger than that given for 2.5-Mev neutrons in the preliminary report by Graves and Coon. If the present measurements are averaged over the larger energy spread used by these authors, a cross section of about 20 millibarns is obtained compared to 5 millibarns observed by Graves and Coon. The shape of the cross section curve given in Fig. 2 is in agreement with the yield curve published by Sikkema. 3 * Work supported by the AEC and the Wisconsin Alumni Research Foundation. t AEC Predoctoral Fellow. » C. H. Johnson and H. H. Barschall, Phys. Rev. 80, 818 (1950). 2 E. R. Graves and J. H. Coon, Phys. Rev. 70, 101 (1946). In more recent measurements, these authors find the above quoted reaction energy instead of -0.6 Mev as originally reported (private communication).3 C. P. Sikkema, Nature 165, 1016 (1950).

The Beta-Spectrum ofHe6

“…Alternately, one may define a ratio " 1*1 _3/ 7 / 2 (r*)/i/2(r*) "4 (4) {line) 4 {/ 2 (r*)} 2 ' then n may be found from r/(e\R\). Table I gives the general relations among f*, \R\ T*, and r applicable to any degenerate semiconductor.…”