New results on the superdeformed 196Bi nucleus a re reported. We have
observed with the EUROBALL IV γ-ray spectrometer array a superdeformed
trans ition of 124 keV which is the lowest observed energy γ-ray in any
superdeformed nucleus. We have de velopped microscopic cranked
Hartree-Fock-Bogoliubov calculations using the SLy4 effective force and a
realistic surface p airing which strongly support the
Kπ=2−(π[651]1/2⊗ν[752]5/2) assignment of this su
perdeformed band