Band structure in Sn 113

The structure of collective bands in Sn-113, populated in the reaction Mo-100(F-19, p5n) at a beam energy of 105 MeV, has been studied. A new positive-parity sequence of eight states extending up to 7764.9 keV and spin (39/2(+)) has been observed. The band is explained as arising from the coupling of the odd valence neutron in the g(7/2) or the d(5/2) orbital to the deformed 2p-2h proton configuration of the neighboring even-A Sn isotope. Lifetimes of six states up to an excitation energy of 9934.9 keV and spin 47/2(-) belonging to a Delta I = 2 intruder band have been measured for the first time, including an upper limit for the last state, from Doppler-shift-attenuation data. A moderate average quadrupole deformation beta(2) = 0.22 +/- 0.02 is deduced from these results for the five states up to spin 43/2(-). The transition quadrupole moments decrease with increase in rotational frequency, indicating a reduction of collectivity with spin, a feature common for terminating bands. The behavior of the kinematic and dynamic moments of inertia as a function of rotational frequency has been studied and total Routhian surface calculations have been performed in an attempt to obtain an insight into the nature of the states near termination.