νi13/2 structures in Sm155 and Gd159 : Supporting evidence of a Z=60 deformed subshell gap

Maximal ground-state deformation should occur when both proton and neutron Fermi surfaces are located at midshell. However, subshell gaps that stabilize large can exist or values other than One such gap may $Z=60$ in the rare-earth region, as energy of first ${2}^{+}$ states even-even nuclei often lowest an isotonic chain for neodymium ($Z=60$) rather midshell isotopes dysprosium ($Z=66$). Further evidence this deformed has now been observed by investigating signature splitting systematics $\ensuremath{\nu}{i}_{13/2}$ bands found odd-$N$, nuclei. These were aided present observation band $^{159}\mathrm{Gd}$ confirmation same structure $^{155}\mathrm{Sm}$ via transfer a from $^{160}\mathrm{Gd}$ beam to $^{154}\mathrm{Sm}$ target.