High spin states in 109Sn.

Abstract

High spin states in $^{109}\mathrm{Sn}$ have been established up to 9.1 MeV in excitation energy and to a spin of 43/${2}^{\mathrm{\ensuremath{-}}}$\ensuremath{\Elzxh} with the reaction $^{94}\mathrm{Mo}$${(}^{19}$F,p3n${)}^{109}$Sn at a beam energy of 88 MeV. In-beam measurements involved \ensuremath{\gamma}-\ensuremath{\gamma} coincidences and directional correlation of oriented states. A negative-parity band consisting of stretched E2 transitions has been established. This band has been identified as the favored signature branch of the decoupled ${\mathrm{h}}_{11/2}$ neutron coupled to the deformed \ensuremath{\pi}(${\mathrm{g}}_{9/2}^{\mathrm{\ensuremath{-}}2}$\ensuremath{\bigotimes}${\mathrm{g}}_{7/2}^{2}$) core configuration. \textcopyright{} 1996 The American Physical Society.