Hg196and the “magical quartet” of the extendedUν(6/12)⊗Uπ(6/4) supersymmetry

Abstract

We present the results of a $\ensuremath{\gamma}\ensuremath{\gamma}$ angular correlation experiment investigating the nucleus $^{196}\mathrm{Hg}$ and compare these with a theoretical description of $^{196}\mathrm{Hg}$ within the ${\mathrm{U}}_{\ensuremath{\nu}}(6/12)\ensuremath{\bigotimes}$${U}_{\ensuremath{\pi}}(6/4)$ extended supersymmetry. To populate excited $^{196}\mathrm{Hg}$ states, we used the Cologne FN Tandem accelerator inducing the reaction $^{194}\mathrm{Pt}$$(\ensuremath{\alpha},2n)^{196}\mathrm{Hg}$ and analyzed the $\ensuremath{\gamma}$ decays of levels up to an excitation energy of $2.4$ MeV with the HORUS cube spectrometer. The new results on this mercury isotope allow a comparison between the experimental data and the supersymmetrical predictions and show good agreement. This way we can add $^{196}\mathrm{Hg}$ as a fifth supermultiplet member to the so-called magical quartet consisting of $^{194,195}\mathrm{Pt}$ and $^{195,196}\mathrm{Au}$.