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Description
Many of deformed heavy nuclei, such as 166Er and
their neighbors in the nuclear chart, are shown to have
triaxial ground and gamma bands with gamma equal to about
10 degrees, with gamma stretching in the gamma bands.
Some other nuclei, like 154Sm, show prolate ground bands,
but their side bands are produced by the shape coexistence of
triaxial shapes with gamma equal to about 15 degrees.
Monopole interactions containing tensor force contributions are
essential for these structures. If time permits, M1 excitations
from these ground states may be discussed, with a possible
mode specific to triaxial ground states.
The calculated results are obtained by the advanced version
of the Monte Carlo Shell Model (MCSM), called the
Quasiparticle Vacuua shell model.
