Time reversal test in /sup 57/Fe

The linear polarization of the E2-M1 122 keV ..gamma.. ray of /sup 57/Fe following the electron capture decay of polarized /sup 57/Co was measured with a Compton polarimeter. An average time-reversal-noninvariant counting asymmetry of (-0.4 +- 0.8) x 10/sup -5/ was obtained. This corresponds to a phase angle between the E/sup 2/ and M1 matrix elements of sineta= (-3.1 +- 6.5) x 10/sup -4/, consistent with time-reversal invariance. (AIP)