Breakdown of $K$ Selection in $^{178}\mathrm{Hf}$

Breakdown of $K$ Selection in ${}^{178}{Hf}$

A. B. Hayes, D. Cline, C. Y. Wu, J. Ai, H. Amro, C. Beausang, R. F. Casten, J. Gerl, A. A. Hecht, A. Heinz, R. Hughes, R. V. F. Janssens, C. J. Lister, A. O. Macchiavelli, D. A. Meyer, E. F. Moore, P. Napiorkowski, R. C. Pardo, Ch. Schlegel, D. Seweryniak, M. W. Simon, J. Srebrny, R. Teng, K. Vetter, and H. J. Wollersheim

Phys. Rev. Lett. 96, 042505 – Published 2 February 2006

Abstract

Coulomb activation of the four quasiparticle $K^{π} = 16^{+}$ ${}^{178}{Hf}$ isomer ( $t_{1 / 2} = 31 y$ ) has led to the measurement of a set of $E λ$ matrix elements coupling the isomer band to the ground band. The present data combined with earlier ${}^{178}{Hf}$ Coulomb excitation data have probed the $K$ components in the wave functions and revealed the onset and saturation of $K$ mixing in low- $K$ bands, whereas the mixing is negligible in the high- $K$ bands. The implications can be applied to other quadrupole-deformed nuclei.

Received 24 June 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.042505

Authors & Affiliations

A. B. Hayes¹, D. Cline¹, C. Y. Wu¹, J. Ai², H. Amro², C. Beausang³, R. F. Casten², J. Gerl⁴, A. A. Hecht², A. Heinz², R. Hughes², R. V. F. Janssens⁵, C. J. Lister⁵, A. O. Macchiavelli⁶, D. A. Meyer², E. F. Moore⁵, P. Napiorkowski⁷, R. C. Pardo⁵, Ch. Schlegel⁴, D. Seweryniak⁵, M. W. Simon¹, J. Srebrny⁷, R. Teng¹, K. Vetter⁶, and H. J. Wollersheim⁴

¹Nuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USA
²Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA
³Physics Department, University of Richmond, Richmond, Virginia 23173, USA
⁴GSI, Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
⁵Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁶Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁷Warsaw University, Warszawa, Poland

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Vol. 96, Iss. 4 — 3 February 2006

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Physical Review Letters

Breakdown of K Selection in Hf178

Phys. Rev. Lett. 96, 042505 – Published 2 February 2006

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Breakdown of $K$ Selection in ${}^{178}{Hf}$