EXCITED BANDS IN THE DOUBLY-MAGIC SUPERDEFORMED DY-152 NUCLEUS - EVIDENCE FOR THE 1ST N=7 PROTON HYPER-INTRUDER ORBITAL

Five excited superdeformed bands have been observed in the doubly clos e-shell superdeformed nucleus 152Dy. Three of the new bands are interp reted in terms of single neutron excitations across the N = 86 shell g ap. One of these bands appears to partly decay into the yrast superdef ormed band. Another band involves a single proton excitation across th e Z = 66 shell gap into the N = 7 hyper-intruder orbital. This is the first evidence of the influence of this deformation driving orbital on superdeformed structures in any mass region.