Directional Correlations in the Decay ofPm148

Abstract

The directional correlation between the 1930-keV 0 group and the 551-keV y in the decay of 5-day 148 Pm has been measured. The anisotropy is found to be only a few percent over the fi energy range from 1050 to 1800 keV. Directional correlations for the following 7-7 cascades in the decay of 41-day 148 Pm have been measured: 414-630 keV, A 2 = -0.07±0.03; 414-551 keV, A*=* ~~0.04db0.03; 288-630 keV, ^2=0.17±0.02; 288-551 keV, J2=0,19±0.02. A note on simple properties of directional correlations involving unobserved y rays which hold in special cases is appended.

The 1-(1.9 MeV ?-)2+ transition in the decay of148Pm

“…However, in contrast to this, the measurements of Sastry [22] do not support such a deviation showing a full -v/c polarization. Finally, it should be pointed out that there is a striking difference between the data of e(W) published by Nainan and Moore [18] and those reported by the other authors [19][20][21] (see Fig. 3).…”

“…3). Moreover, the authors of [19][20][21] mention that, in view of the strong discrepancy between their own data and the results of Nainan and Moore [18], several auxiliary experiments have been performed to ascertain the reliability of their own instruments. Finally, they claim that a negative anisotropy can be ruled out.…”

“…3). However, all measurements [18][19][20][21] have been done almost simultaneously and with equivalent set-ups.…”

“…3. Experimental fl-7 directional correlation coefficient taken from [18][19][20][21] as a function of energy. In the case of [21] only some typical points are displayed to avoid the crowding of the plot.…”