Nuclear excitation of ${}^{111}{Cd}$ by positron annihilation

Nuclear excitation of

{}^{111}{Cd}

by positron annihilation has been investigated. The experimental evidence for this process was searched by observing the 245-keV

γ

rays from

{}^{111}{Cd}^{m}

after irradiation of natural cadmium foils by positrons from the

β^{+}

decay of

{}^{64}{Cu}

. For the excited level of 1330 keV in

{}^{111}{Cd}

, the experimental cross section of the annihilation-excitation process has been estimated to be less than 8.6×

10^{- 25}

{cm}^{2}

. This upper limit is larger than the simple theoretical estimate. Further improvements of theoretical and experimental studies are discussed.

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Nuclear excitation ofCd111by positron annihilation