Nonidentical twin bands in doubly odd Lu-170 - art. no. 044309

The doubly odd nucleus Lu-170 has been studied using the Dy-164(B-11,5n) re action at 63 MeV bombarding energy. A near yrast level scheme was construct ed comprising 11 rotational bands. Among them, the <(pi)over tilde>h(9/2) x <(nu)over tilde>i(13/2) staggered semidecoupled structure has been establi shed up to I = 30 (h) over bar. The doubly decoupled band <(pi)over tilde>h (9/2)x<(nu)over tilde>1/2(-)[521] and a Newby shifted K = 0 band were also found. A set of three bands resembles a band structure present in the neigh boring odd-A isotopes. One of these shows a striking similarity in transiti on energies to the <(pi)over tilde>7/2(+)[404] band in Lu-171 and hence thi s pair has been cataloged as twin bands. However, their extracted moments o f inertia appear to be very different and therefore they cannot be consider ed identical bands in the usual sense. [S0556-2813(99)00509-9].