Study of $^{155}$\textrm{Gd} by the (p,d$\gamma$) Reaction*

The structure of the $N=90$ and neighboring nuclei have been of recent interest due to an unusual number of low-lying $0^+$ states and a rapid change from vibrational to rotational character. The single, unpaired neutron in $^{155}$\textrm{Gd} ($N=91$) acts as a probe to the $^{154}$\textrm{Gd} ($N=90$) core. To study this, an experiment was conducted at the 88-Inch Cyclotron at LBNL using the STARS and LiBerACE detector arrays. A 25 MeV proton beam incident onto a $^{156}$\textrm{Gd} target was used to populate states in $^{155}$\textrm{Gd} by the (p,d$\gamma$) reaction. The exit channel of the reaction and the residual excitation energy of the nucleus were tagged by detecting scattered charged particles in a \textrm{Si} telescope array (STARS) while coincident gamma rays were detected using 6 \textrm{Ge} clovers and 1 \textrm{Ge} LEPS detector of the LiBerACE array. Particle-$\gamma$ and particle-$\gamma$-$\gamma$ correlations are used to probe the structure of $^{155}$\textrm{Gd}. Preliminary results are presented.