A /3-decay energy systematics is presented which exhibits linear relations for disintegration energies between atoms (Z,N) and (Z-f-1, TV-1) when plotted as a function of N keeping Z constant. Separate plots are necessary for odd and even values of A. The disintegration energy lines show marked discontinuities for N=50, 82, and 126. There is also considerable indication of a discontinuity at TV=28, and in the region of iV=20 sharp changes in slope are observed. Proton magic numbers at 50, 82, and possibly 28 are indicated by gaps in the spacing of the disintegration energy lines. No definite submagic numbers are at present identifiable. Changes in the even-odd differences of neutron and proton binding energies show up as changes in the line separation pattern. The most striking pattern changes can be interpreted as due to decreases in the even-odd differences for both neutrons and protons after their respective magic numbers. The systematics is useful in estimating disintegration energies in cases where measurements have not yet been made. Part of a systematics for double fi decay is also shown.
Short‐wave fadeouts were sought which had no associated Hα flare. To carry out this study, Sacramento Peak flare patrol films were re‐examined for those days on which short‐wave fadeouts (SWF's) had occurred during patrol times without reported flares. Fifteen such fadeouts were reported during the IGY period. Upon re‐examination of the films, 12 of the SWF's were found to be in close time association with outstanding Hα events, usually in the nature of pronounced plage brightenings. In 2 other cases, seeing was so poor that no definite statement could be made about possible Hα activity. In only 1 case was there definitely no unusual Hα event in time association with the fadeout.
For each of the 15 cases, the flare film for the entire day was re‐examined without previous knowledge of the time of the SWF. Any periods of outstanding Hα activity were selected and their times noted; only after their independent selection were their times matched to SWF times. Usually there was only 1 such outstanding period of optical activity per day. The time association with SWF was, in general, very close.
The results indicate that outstanding Hα activity is essential in time relation with SWF occurrence.
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