Speaker
Description
Moving past the $N=104$ midshell and approaching the $Z=82$ shell closure presents several opportunities to study nuclear structure as single-particle degrees of freedom compete with collective phenomena to determine several of the spectroscopic properties observed. The Os ($Z=76$) isotopic family presents a compelling study case among the rare-earth nuclei, as it exhibits a variety of deformation and transition phenomena. $^{184}$Os ($N=108$) presents an especially interesting case among Os isotopes, featuring a rotational ground-state band, but also several other collective states, such as high-$K$ isomers, $\beta$- and $\gamma$-bands, where only scattered experimental information is known. The proxy-SU(3) model also predicts the presence of shape-coexistence in this nucleus.
$\quad$To investigate its nuclear structure, a fusion-evaporation reaction experiment was performed. Excited states in $^{184}$Os were populated via the $^{176}$Yb($^{12}$C,4n)$^{184}$Os reaction using a highly enriched (isotopic) metallic $^{176}$Yb target and a $^{12}$C beam at 60 MeV. The de-excitation $\gamma$-rays were detected using the ROSPHERE array. The current work focuses on consolidating the structure of low-energy states in $^{184}$Os, especially weakly-populated states in side bands. The present results expand existing spectroscopy information and include new measurements of several branching ratios.
* This work is supported by EURO-LABS (EU Horizon Europe Project No. 101057511) and the German Research Foundation under the grant 539757749.