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Phys. Rev. Lett. 89, 242501 (2002) [4 pages]

Coulomb Excitation Paths of High-K Isomer Bands in 178Hf

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A. B. Hayes, D. Cline, C. Y. Wu, M. W. Simon, and R. Teng
Nuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627

J. Gerl, Ch. Schlegel, and H. J. Wollersheim
GSI, Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany

A. O. Macchiavelli and K. Vetter
Lawrence Berkeley National Laboratory, Berkeley, California 94720

P. Napiorkowski1 and J. Srebrny2
1Heavy Ion Laboratory, Warsaw University, Warszawa, Poland
2Institute of Experimental Physics, Warsaw University, Warszawa, Poland

Received 31 July 2002; published 20 November 2002

Three distinctly different mechanisms are shown to populate the Kπ=6+ (t1/2=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 13K=6+, 20K=16+, and 14K=8- with in-band γ yields of ∼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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.242501
DOI:
10.1103/PhysRevLett.89.242501
PACS:
27.70.+q, 21.60.Ev, 23.20.Lv, 25.70.De
 
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