These can be compared directly with the V g0 doublet to get the energy level diagram shown in Fig. 1. Because the largest error occurs in the V 50 doublet, it mattered little whether we used the new Ti 50 and Cr 50 doublets alone or the combined results in making the energy comparisons.
SO V
60CR 50
LETTERSTO that a-particles constitute about 10 percent of the primary flux and that accordingly the ratio of a-particles to protons remains relatively constant over a large energy range. This seems to be in agreement with results previously reported, 2 which indicate a similar velocity spectrum for all components of the primary beam, and is not in agreement with the predictions of the simple Fermi 3 theory of acceleration of cosmic-ray primaries. * This research was assisted by the AEO i Winckler, Stix, Dwight, and Sabin, Phys. Rev. 79, 656 (1950). 2Kaplon, Peters, and Ritson, Phys. Rev. 85, 900 (1952). 3 E. Fermi, Phys. Rev. 75, 1169 (1949. For an integral energy spectrum varying as N =K/e' y , where e is the kinetic energy in Bev/nucleon, Fermi gives yp/y a =X a /Xp, where X is the absorption mean free path. As Xa^ |X P , we find Np/N a = (K P /K a ) e 7 . For the energy region of this experiment one obtains N P /N a^S XIO^; (K P /K a &5). We believe therefore that our results are significant, notwithstanding the poor statistics.
The directional angular correlations of the 208.36-112.97 kev gamma-gamma cascade in Hf 177 and the 89. 36-343.40 and 282.57-113.81 kev cascades in Lu 175 have been measured with a coincidence scintillation spectrometer using Nal detectors. The observed correlation functions obtained with dilute aqueous solution sources are IF(0) = 1-(O.1614±O.OO15)P 2 (cos0), W(d) = l + (0.001 ±O.OO4)P 2 (cos0), and W(d) = l + (O.221±O.OO4)J? 2 (cos0), respectively.These results, taken together with conversion coefficient measurements, indicate that 5 2 for the 282.57-kev gamma ray in Lu 175 is 0.05. The sign of 8, defined below, is positive. The mixing ratio of the 208.36-kev gamma ray in Hf 177 is M2/El=0.001; in this case the sign of 8 is negative. The sign of 8 for the 113.81-kev gamma ray in Lu 175 is positive, and the sign of 8 for the 112.97-kev gamma ray in Hf 177 is negative.
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