Search for tetrahedral bands in yb isotopes
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Date
2007
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of the Western Cape
Abstract
Calculations by Dudek et al. predict shell gaps for tetrahedrally shaped nuclei at various proton and neutron numbers. 160Yb is expected to be a favourable nucleus, with tetrahedral bands predicted to lie 1 MeV above the ground state. A search for such states has been performed using the Afrodite Ge detector array at iThemba LABS. A 73MeV
160 beam bombarded a 147Sm target of thickness 3mg/cm2 to produce 160Yb at low spin and high excitation energy. After analysis of the data, new rotational bands have been added to the level scheme. Although these bands are in the expected energy interval for the tetrahedral states, they do not show the expected decay properties of the tetrahedral bands. Rather, we interpret them as vibrational y and 13 bands.
Description
Doctor Educationis
Keywords
Beta bands, Dipole, Gamma bands, Negative parity bands, Tetrahedral bands