Search for an M0 transition in Yb170

We have examined the suggestion that an M0 transition occurs between the 2819.6-keV 0- level of Yb170 and the 0+ ground state by internal-conversion electron emission. Gamma rays, internal-conversion electrons, and internal e+e- pairs were detected from the β+ and electron capture decay of two-day Lu170 (0+). At an upper limit of 2×10-8 electron per Lu170 decay, no evidence was obtained for M0 decay of the 2819.6-keV level of Yb170 by single-electron emission.