High-K barrier penetration in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Hf</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>174</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>: A challenge to K selection

P. M. Walker; G. Sletten; N. L. Gjrup; M. A. Bentley; J. Borggreen; B. Fabricius; A. Holm; D. Howe; J. Pedersen; J. W. Roberts; J. F. Sharpey-Schafer

doi:10.1103/PhysRevLett.65.416

High-K barrier penetration in ${}^{174}{Hf}$ : A challenge to K selection

P. M. Walker, G. Sletten, N. L. Gjrup, M. A. Bentley, J. Borggreen, B. Fabricius, A. Holm, D. Howe, J. Pedersen, J. W. Roberts, and J. F. Sharpey-Schafer

Phys. Rev. Lett. 65, 416 – Published 23 July 1990

Abstract

A sensitive study of the decay of the deformation-aligned K=14, 4-μs isomer in ${}^{174}{Hf}$ has revealed a multitude of the K-forbidden branches to the ground-state rotational band and other low-K bands, in competition with the known decays to high-K bands. The isomeric transitions have consistently low hindrance factors. These anomalous findings in an axially symmetric deformed nucleus severely test our understanding of the K-selection rule. The isomeric decay to an I=12 rotation-aligned state, and its mixing with the I=12 yrast state, provide a partial explanation.

Received 7 December 1989

DOI:https://doi.org/10.1103/PhysRevLett.65.416

Authors & Affiliations

P. M. Walker, G. Sletten, N. L. Gjrup, M. A. Bentley, J. Borggreen, B. Fabricius, A. Holm, D. Howe, J. Pedersen, J. W. Roberts, and J. F. Sharpey-Schafer

Department of Physics, University of Surrey, Guildford GU2 5XH, United Kingdom
Niels Bohr Institute, Riso?, DK-4000 Roskilde, Denmark
Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United Kingdom