The doubly odd nucleus 144Pm: (II). Interpretation

Results from the proton transfer reactions, ¹⁴³Nd(³He, d) and ¹⁴³Nd(α, t), and γ-ray studies have been used to characterize the levels in ¹⁴⁴Pm. The spins, $\text{(}{}^3\text{He, d)}\text{(α, t)}$ cross section ratios and γ-ray branching ratios for the states below 600 keV can be interpreted consistently in terms of the mixed $\text{π2}\text{d}{}_{\mathrm{<mtext>5</mtext><mtext>2</mtext>}}\text{ν2}\text{f}{}_{\mathrm{<mtext>7</mtext><mtext>2</mtext>}}$ and $\text{π1}\text{g}{}_{\mathrm{<mtext>7</mtext><mtext>2</mtext>}}\text{ν2}\text{f}{}_{\mathrm{<mtext>7</mtext><mtext>2</mtext>}}$ shell-model configurations. The γ-ray intensity ratios measured in the ¹⁴¹Pr(α, nγ) and ¹⁴⁴Nd(p, nγ) reactions exhibit a strong and smooth dependence on level spin. Theoretical calculations employing a residual surface delta interaction are in reasonable agreement with the twelve observed low-lying negative parity states. The eight positive parity states between 841 and 1451 keV are presumed to arise from the $\text{π1}\text{h}{}_{\mathrm{<mtext>11</mtext><mtext>2</mtext>}}\text{ν2}\text{f}{}_{\mathrm{<mtext>5</mtext><mtext>2</mtext>}}$ configuration.