title: Coulomb excitation paths of high-K isomer bands in 178Hf.
abstract: Three distinctly different mechanisms are shown to populate the K(pi)=6(+) (t(1/2)=77 ns), 16(+) (31 yr), and 8(-) (4 s) isomer bands of 178Hf by Coulomb excitation. High spin states of the three isomer bands were populated by Coulomb excitation of a hafnium target with a 650 MeV 136Xe beam. Although direct population of high-K bands is highly K-forbidden, isomer bands in 178Hf were populated up to spins 13(+)(K=6), 20(+)(K=16), and 14(-)(K=8) with in-band gamma yields of approximately 10(-4) of the ground state band. The data are consistent with a rapid increase in K mixing with increasing spin in the isomer bands.
authors.affiliation: Nuclear Structure Research Laboratory, Department of Physics, University of Rochester, New York 14627, USA.
authors.forename: A B
authors.initials: AB
authors.lastname: Hayes
authors.forename: D
authors.initials: D
authors.lastname: Cline
authors.forename: C Y
authors.initials: CY
authors.lastname: Wu
authors.forename: M W
authors.initials: MW
authors.lastname: Simon
authors.forename: R
authors.initials: R
authors.lastname: Teng
authors.forename: J
authors.initials: J
authors.lastname: Gerl
authors.forename: Ch
authors.initials: Ch
authors.lastname: Schlegel
authors.forename: H J
authors.initials: HJ
authors.lastname: Wollersheim
authors.forename: A O
authors.initials: AO
authors.lastname: Macchiavelli
authors.forename: K
authors.initials: K
authors.lastname: Vetter
authors.forename: P
authors.initials: P
authors.lastname: Napiorkowski
authors.forename: J
authors.initials: J
authors.lastname: Srebrny