The two-neutron transfer reaction ${}_{}{}^{147}{}_{}{}^{}\mathrm{Sm}$(p,t${)}^{145}$Sm was studied at ${\mathit{E}}_{\mathit{p}}$=26 MeV. Angular distributions were measured for ${\mathrm{\theta }}_{\mathrm{lab}}$=5°–50°. The strength of the two neutron monopole pairing phonon⊗particle configuration (${\mathit{n}}_{\mathrm{-}}$=1,${\mathit{n}}_{+}$=1)⊗ν2${\mathit{f}}_{7/2}$ is identified in odd mass ${}_{}{}^{145}{}_{}{}^{}\mathrm{Sm}$ and is found to be quasi-uniformly spread in two narrow groups of as many as 8+5=13 states. This unexpected large fragmentation is compared with the one in the core nucleus ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$ and with that from its isotone ${}_{}{}^{143}{}_{}{}^{}\mathrm{Nd}$ where the monopole pairing vibration is less fragmented. The couplings with other excitation modes are extracted.

• Received 23 December 1993

DOI:https://doi.org/10.1103/PhysRevC.49.R1742