Dysprosium 157

Discovery of samarium, europium, gadolinium, and terbium isotopes

“…The quoted half-life limit of >30 y is consistent with the currently accepted value of 71 (7) y. Previously only limits of <30 min or >100 y [119], <10 min or >5 y [117] and <4 h or >10 y [120]. Also, an earlier report of a 4.7(1) d half-life [116] was evidently incorrect.…”

Discovery of dysprosium, holmium, erbium, thulium, and ytterbium isotopes

“…DyHandley and Olson discovered 157 Dy as reported in the 1953 paper "Dysprosium 157"[39]. Terbium oxide wasbombarded with 24 Mev protons from the Oak Ridge 86-in.…”