Depopulation of the isomeric state ${}^{180}{Ta}^{m}$ by the reaction ${}^{180}{Ta}^{m} (γ, γ^{'}) {}^{180}{Ta}$

The irradiation of an enriched sample of

{}^{180}{Ta}^{m}

with bremsstrahlung from a linear accelerator having an end-point energy of 6 MeV has excited a strong channel for the reaction

{}^{180}{Ta}^{m} (γ, γ^{'}) {}^{180}{Ta}

, which requires a total spin change of

8 ℏ

. An integrated cross section of 4.8×

10^{- 25}

{cm}^{2}

keV has been found. This is a large value exceeding by two orders of magnitude known cross sections for (

γ, γ^{'}

) reactions producing isomers of other species.

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Depopulation of the isomeric stateTam180by the reactionTam180(γ,γ′)Ta180