New insights into the collective band structures of nuclei with A = 100–112.

With our high statistics γ-γ-γ data set taken with Gammasphere, we have identified a variety of new phenomena in A = 100–112 nuclei. The one- and two- phonon γ bands in ^104,106Mo have been extended and similar bands identified in ¹⁰⁸Mo and for the first time in both an odd N nucleus, ¹⁰⁵Mo and an odd Z nucleus, ¹⁰³Nb. The one- and two- phonon γ band energy levels in ^{104,105,106,108}Mo are remarkably similar with a trend toward lower energy as N increases. In ^108,110,112Ru the one phonon γ bands show a completely different behavior from ¹⁰⁴–¹⁰⁸Mo with very large odd-even spin level energy staggering in ¹¹²Ru. Our data indicate a maximum triaxiality around ¹¹²Ru. In ¹⁰⁰Nb which lies between N = 58 and 60 where a sudden shift from spherical to superdeformed structures occurs in Sr and Zr nuclei, we have discovered a K^π = 1⁺ deformed ground state band. In ¹⁰⁸Tc, we found the first pseudospin partner bands with nearly degenerate energies in this mass region. [ABSTRACT FROM AUTHOR]