Elsevier

Nuclear Physics A

Volume 469, Issue 2, 27 July 1987, Pages 348-368
Nuclear Physics A

IBA-1 calculations of E2/M1 mixing ratios

https://doi.org/10.1016/0375-9474(87)90115-1Get rights and content

Abstract

The interacting-boson approximation is applied in its basic form (IBA-1) to the calculation of γ-ray E2/M1 mixing ratios. The description is tested on a variety of even nuclei with adequate experimental data: 146–152Sm, 152–156Gd, 162Dy, 162–168Er, 172Yb, 190Os. The consistent-Q formalism of Warner and Casten and its extension to the vibrational region are used. The three M1 transition parameters of IBA-1 are chosen so as to display acceptably smooth systematics, in contrast to earlier calculations reviewed for comparison. The calculated M1 matrix elements are found to depend strongly both on the wave functions and on the M1 parameters. Comparison is made with the few available IBA-2 results as well as with the two-fluid Frankfurt model and Kumar's microscopic model.

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    Supported in part by the Academy of Finland. Present address: Research Institute for Theoretical Physics, Siltavuorenpenger 20 C, SF-00170 Helsinki, Finland.

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