Elsevier

Nuclear Physics A

Volume 648, Issues 1–2, 15 March 1999, Pages 64-72
Nuclear Physics A

De-excitation of high spin isomers in the 191Pb isotope

https://doi.org/10.1016/S0375-9474(99)00017-2Get rights and content

Abstract

The 191Pb isotope, produced through different A(b,xn)191Pb reactions, where b stands for nuclei such as 16O, 20Ne, and 31P, is studied. The half-life of some excited levels being greater than 10 ns, the recoil catcher method is suitable to look into the de-excitation γ ray and conversion electron spectra of these states. The conversion coefficients are deduced and e-γ and γ-γ coincidence measurements lead to the part of the level scheme de-exciting these isomers. This level scheme is compared to theoretical predictions obtained through a microscopic calculation in a three quasi-particle approximation, using a surface delta interaction with a reduced pairing component. The conclusions are very similar to those previously obtained for 193Pb.

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