Yrast spectroscopy in 49-51Ti via fusion-evaporation reaction induced by a radioactive beam

In-beam gamma-ray spectroscopy of high-spin states in Ti49-51 was performed via the fusion-evaporation reaction using a radioactive beam. By excitation function and gamma-gamma coincidence analysis, yrast high-spin levels up to I = (21/2(-)), (11(+)),(17/2(-)) in Ti49-51 were determined. The levels were compared with full-pf-shell model calculation. The level structure indicates the persistency of the N = 28 shell gap at yrast states in 4(9-51)Ti.