γ−γDirectional Correlations in the Decay ofIr192

Abstract

1259 the yield of Er iw is high by a factor of 6 from that obtained from the Gaussian curve. We feel that most of this discrepancy is due to a combination of Er, Tm, and Yb target impurities. Part of it could also be due to radioactive impurities in the low-counting Er samples.These two sources of error operate in opposite directions, one tending to lower an observed yield, the other tending to raise it. An error in one measurement changes the Gaussian curve that we have fitted, using that value, thus obscuring errors in other measurements. Fortunately, the two sources of error are probably not important for any one product. The combined effect is then a general increase in scatter from the smooth Gaussian curve. As noted before, the average deviation from the curve is about 15%, which is not much greater than the average accuracy of the individual results. SUMMARYWe have measured the fission yields of a number of products formed in low yield from 14.8-MeV neutron fission of Th 232 , U 235 , and U 238 . The results show that, within experimental uncertainty, the wings of the mass-

Gamma-gamma directional correlation measurements in192Os

“…Hirshfeld et al [8] The other solution, 6(201.3 keV)= -0.40 (5), is excluded due to electron conversion and nuclear orientation data. b Calculated by setting 6(283.3)= -4.3.…”

Study of the radioactive decay of192Ir

“…A spin value of 4 + was assigned to the level at 1201-keV at 192pt by all previous workers [18][19][20][21].…”