Single-particle behavior atN=126: Isomeric decays in neutron-richPt204
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Abstract
The four proton-hole nucleus $^{204}\mathrm{Pt}$ was populated in the fragmentation of an $E/A=1$ GeV $^{208}\mathrm{Pb}$ beam. The yrast structure of $^{204}\mathrm{Pt}$ has been observed up to angular momentum $I=10\ensuremath{\hbar}$ by detecting delayed $\ensuremath{\gamma}$-ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of ${I}^{\ensuremath{\pi}}=({10}^{+})$, $({7}^{\ensuremath{-}})$, and $({5}^{\ensuremath{-}})$ and half-lives of ${T}_{1/2}=146(14) \mathit{ns}$, $55(3)\ensuremath{\mu}$s, and $5.5(7)\ensuremath{\mu}$s, respectively. The structure of the magic $N=126$ $^{204}\mathrm{Pt}$ nucleus is discussed and understood in terms of the spherical shell model. The data suggest a revision of the two-body interaction for $N=126$, $Z<82$, which determines the evolution of nuclear structure toward the r-process waiting point nuclei.
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