Alpha-decaying low-spin levels in155Lu and157Lu

Using an on-line mass separator, the -particle decays of¹⁵⁵Lu and¹⁵⁷Lu were investigated. A new -emitting level in¹⁵⁷Lu was identified [T_1/2=5.7(5) s,E=4924(20) keV]. In addition, a half-life of 140(20) ms was measured for the recently discovered second, low-lying, -decaying level [E=5579 (5)keV] in¹⁵⁵Lu.We wish to thank L.F. Archambault, R.B. Firestone, A.A. Shihab-Eldin, and A.A. Wydler for their contributions to this experimental program. We also express thanks to the staff of the SuperHILAC for providing smooth operation of the accelerator.