Investigations of Dy159-163 using incomplete fusion reactions

Abstract

The isotopes Dy159-163 have been investigated using the incomplete fusion reactions Li-7 --> Gd-158,Gd-160 at beam energies of 8 MeV/u. The gamma -rays were detected in the GASP spectrometer in coincidence with the fast charged particles detected in the ISIS silicon ball. The level schemes of all five isotopes could be amply extended. The most important result was the observation of both the ground state and Stockholm bands in Dy-162 up to high spin covering the band crossing region. The crossing in this nucleus is shifted to a higher frequency in comparison to the lighter Dy isotopes. The interaction strength between the two bands could be determined with high precision and with this result, a full oscillation of the interaction strength from one node to the next within an isotopic chain could be observed for the first time.