Coulomb excitation paths of high-K isomer bands in 178Hf.
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.
Hayes
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AB
Nuclear Structure Research Laboratory, Department of Physics, University of Rochester, New York 14627, USA.
Cline
D
D
Wu
C Y
CY
Simon
M W
MW
Teng
R
R
Gerl
J
J
Schlegel
Ch
Ch
Wollersheim
H J
HJ
Macchiavelli
A O
AO
Vetter
K
K
Napiorkowski
P
P
Srebrny
J
J