Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements


Werner V., Benczer-Koller N., Kumbartzki G., Holt J. D. , Boutachkov P., Stefanova E., ...Daha Fazla

PHYSICAL REVIEW C, cilt.78, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

Using the transient field technique, the magnetic moments of the second excited 2(+) states in (92,94)Zr have been measured for the first time. The large positive g factors, g( 2(2)(+); (92)Zr) = + 0.76(50) and g(2(2)(+); (94)Zr) = + 0.88( 27), which are in contrast to the known negative g factors of the 2(1)(+) states, are found to be a consequence of weak proton-neutron coupling combined with the Z = 40 subshell closure. From their large M1 transition strengths to the 2(1)(+) states, in earlier works an assignment to the 2(2)(+) states as proton-neutron symmetric and mixed-symmetry states has been made, which are now found to be polarized in their proton-neutron content. This fact allows to identify the underlying microscopic main configurations in the wave functions, which form the building blocks of symmetric and mixed-symmetry states in this region as valence nucleons are added and shell structure changes.