Abstract
High spin states in $^{68}\mathrm{As}$ have been studied using the $^{56}\mathrm{Fe}$${(}^{14}$N,2n${)}^{68}$As, $^{58}\mathrm{Ni}$ ${(}^{12}$C,pn${)}^{68}$As, and $^{46}\mathrm{Ti}$${(}^{25}$ Mg,p2n${)}^{68}$As reactions. New high spin states have been observed including a band structure above the known 2160 keV isomeric state. A microscopic description based on the EXCITED VAMPIR model for negative and positive parity states in $^{68}\mathrm{As}$ is presented. A possible mechanism to populate the observed high spin isomeric state is proposed. The complex structure of the $^{68}\mathrm{As}$ nucleus is caused essentially by specific shape coexistence effects. \textcopyright{} 1996 The American Physical Society.
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