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

par Lagrange, J.M. J.M.;Pautrat, Michèle;Dionisio, J.S. J.S.;Vieu, Ch;Vanhorenbeeck, Jean
Référence Nuclear physics. A, 648, 1-2, page (64-72)
Publication Publié, 1999-03

Article révisé par les pairs

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Résumé :

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. © 1999 Elsevier Science B.V.