This paper contains several graphs and nomographs which make it possible to obtain, very quickly, log(//) values for most 0-decays. The use of these figures is discussed.

The liquid structure theory of Born and Green is used to interpret x-ray diffraction measurements on liquid sodium and potassium to find an effective interatomic potential function for pairs of sodium and pairs of potassium atoms. This potential function predicts approximately the correct binding energy for solid sodium and potassium, and when reinserted in the x-ray formulas predicts scattering curves at higher temperatures which are in good agreement with experiments.

which can be derived from considerations of the momentum space degeneracy of the outgoing particles.In line with the suggestions of Weisskopf, Feshbach, and Peaslee, 7 Wigner 8 has shown that widths are also proportional to level spacing, D } whence (6) becomes TacEW.Relation (5) must then be considered valid only in cases of neutron capture. Since level spacings in neutron capture are about 10 ev, in general, (5) must be replaced by r/£*£~4XlO-B (ev)-*.Applying (8) to the case of alpha-decay, JS*~2.5X10 3 (ev)*, £-40* ev whence T~10 4 ev.The value of D was obtained from the measured energy differences between various energy groups in natural alpha-decay. 9 Comparison of (9) with (3) indicates that the ratio of neutron width to alpha-width without barrier is about 0.1; and comparison of (3) with the width from the one-body theory (0.8 Mev) indicates that the "probability of formation of an alpha-particle" in a nucleus (i.e., the correction for the many-body theory over the one-body theory) is about one-eighth. Either of these last two values may be in error by a factor of 10 or more. S INCE the energy loss of a slow heavy particle is predominantly to recoiling gas atoms, ionization by secondary heavy particles contributes a large fraction of the total ionization resulting from a slow heavy particle that is stopped in a gas.Let r} be the ionization efficiency o e I/E of a primary particle of energy E which gives rise to the number of ion pairs /, where c<>* is the energy loss per ion pair of a particle the energy of which is very high. The ionization efficiency satisfies an equation of the formin which ^' -oi e I'/E' is the ionization efficiency of a gas atom of energy E f in its own gas. The functions /x and X are given by ^co e 7& kev). Up to these velocities b v and b v ' are practically constant, 1 except for...

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