Distribution of Nuclear Mechanical Moments

Abstract

AT present, the nuclear mechanical spins of about fifty atoms, including about sixty isotopes, are known. Of these, the spins of fifty-three odd atomic weight isotopes are known with a fair degree of certainty, some doubt existing only in very few cases. Two types of odd atomic weight atoms exist, namely, those with odd atomic number (A) and those with even atomic number (B). The former possess an odd nuclear proton, the latter an odd nuclear neutron. Amongst the fifty-three fairly reliable spins, thirty-nine belong to the former class and fourteen to the latter. The distributions of the nuclear mechanical moments in the two classes are shown in Fig. 1.