High spin states in singly closed ¹⁴³Pm

The high spin states in the N=82 odd-A ¹⁴³Pm have been investigated by in-beam γ-spectroscopic techniques following the reactions ¹³⁵Ba(¹¹B,3n)¹⁴³Pm at E=47 MeV and ¹³³Cs(¹³C,3n)¹⁴³Pm 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 γ rays have been assigned to ¹⁴³Pm on the basis of the γ-ray singles and γ-γ coincidence data. The level scheme of ¹⁴³Pm has been extended up to an excitation energy of 8.4 MeV and spin 47/2ħ 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.