High spin states in singly closed143Pm

Abstract

The high spin states in the $N=82$ odd-A ${}^{143}\mathrm{Pm}$ have been investigated by in-beam $\ensuremath{\gamma}$-spectroscopic techniques following the reactions ${}^{135}\mathrm{Ba}{(}^{11}\mathrm{B}{,3n)}^{143}\mathrm{Pm}$ at $E=47$ MeV and ${}^{133}\mathrm{Cs}{(}^{13}\mathrm{C}{,3n)}^{143}\mathrm{Pm}$ at $E=63$ MeV, respectively, using a gamma detector array, consisting of 12 Compton-supressed high purity germanium detectors and a multiplicity ball of 14 bismuth germanate elements. 28 new $\ensuremath{\gamma}$ rays have been assigned to ${}^{143}\mathrm{Pm}$ on the basis of the $\ensuremath{\gamma}$-ray singles and $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence data. The level scheme of ${}^{143}\mathrm{Pm}$ has been extended up to an excitation energy of 8.4 MeV and spin $47/2\ensuremath{\Elzxh}$ and 24 new levels have been proposed. Spin-parity assignments for most of the newly proposed levels have been made using the measured directional correlation orientation ratios for strong transitions. The observed level structure is discussed in the light of available experimental data and a modest shell model calculation done by us, using the OXBASH code.