Short-lived isomers in Po and Po

Andel, B.*; Andreyev, A. N.; Antalic, S.*; Heberger, F. P.*; Ackermann, D.*; Hofmann, S.*; Huyse, M.*; Kalaninov, Z.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Lommel, B.*; Nishio, Katsuhisa   ; Page, R. D.*; Sulignano, B.*; Van Duppen, P.*

Isomeric states in Po and Po were studied at the velocity filter SHIP. The isotopes were produced in the fusion-evaporation reactions Pr(Fe, )Po and Sm(V, )Po. Several new -ray transitions were attributed to the isomers and - coincidences for both isomers were studied for the first time. The 459-keV transition earlier, tentatively proposed as de-exciting the isomeric level in Po, was replaced by a new 248-keV transition, and the spin of this isomer was reassigned from (11) to (10). The de-excitation of the (11) isomeric level in Po by the 154-keV transition was confirmed and a parallel de-excitation by a 733-keV (E3) transition to (8) level of the ground-state band was suggested. Moreover, side feeding to the (4) level of the ground-state band was proposed. The paper also discusses strengths of transitions de-exciting 11 isomers in neighboring Po and Pb isotopes.