Yrare low-spin positive-parity states in N=88 66154Dy

Low-spin positive-parity yrare states of (154)(66)Dy88 were established using the Gd-155(He-3, 4n) reaction at a beam energy of E-lab = 37.5 MeV. The AFRODITE spectrometer array at iThemba LABS was used to record gamma gamma coincidences and measure DCO ratios and polarisation asymmetries. The K-pi = 2(+) gamma band has been observed up to spin 13(+) in the odd spins and to 12(+) in the even spins. The staggering parameter S(I) of the. band is compared to that found in other N = 88 isotones. Different behaviour of S(I) with increasing spin is observed for each of the isotones. We conjecture that the variation in S(I) is mainly due to mixing of the even-spin states with the same spin and parity states in neighbouring rotational bands. A second K-pi = 2(+) band has been established up to a spin of 12(+) in the even spins. We suggest that this is a. band based on the J(pi) = 0(+) state at E-x = 660.6keV.