EDITOR 1269 and minus 1 kev. Assuming the A\ (p,y) resonance to lie at 993.3 kev we then found the F(p,y) resonance at 873.1 kev and the Li 7 (p,n)Be 7 threshold at 1880 kev agreeing with Herb, Snowden, and Sala's values to well within our voltage ripple. This scale then puts the T 3 (£,»)He 3 threshold at 1019"i + * kev, giving a Q value of -763.7 kev, where the mass factor used was 0.749s.Assuming zero-neutrino mass and a beta-ray end point of 18.3 kev this threshold measurement gives the n-H mass difference as 782 ± 1.5 kev. The 18.3-kev end point which gives the T 3 -He 3 mass difference has been measured in this laboratory by Graves and Meyer 3 and by McKibben and Shurig. 4 This value is in agreement with other recent results. 6 The neutron-proton mass difference determined here is roughly 18 kev lower than that given by Bell and Elliott 6 and that reported by Jenkins. 7 The systematic errors, aside from the absolute energy scale, which one would expect in our experiment are all such as to raise the threshold of T 3 (£,w)He 3 and therefore the neutron-hydrogen mass difference.T HE beta-spectrum of I 131 has recently been studied in this laboratory 1 with a view toward determining its possible complexity. In connection with this study a number of internal conversion lines were found and were assigned as K, L and M lines of four gamma-ray energies. Metzger and Deutsch 2 also have recently made a study of the I 131 radiations. Their report did not include a gamma-ray of 163 kev energy
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.