Excitation Functions of Proton-Induced Reactions ofNb93

The excitation functions for the ($p, n$), ($p, \mathrm{pn}$), and ($p, \alpha n$) reactions of ${\mathrm{Nb}}^{93}$ have been determined with proton energies up to 21 Mev. A new niobium activity with half-life of 13±2 hours was found and has been assigned to an isomeric state of ${\mathrm{Nb}}^{92}$. This new activity decays by electron capture and emits a 2.35-Mev gamma ray. Recent results by other workers on the characteristics of the 10-day ${\mathrm{Nb}}^{92}$ were verified.