Ce140(d, p)Ce141at 17 MeV

The reaction ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ce}(d, p)$ has been studied at an incident deuteron energy of 17 MeV. Reaction protons were detected with an Enge split-pole spectrograph using a high-resolution position-sensitive (helix) gas counter and photographic emulsions as detectors. The energy resolution ranged from 11 to 13 keV. Angular distributions were measured in 3-5° steps for $6°\le \theta \le 55°$. $l$-transfer assignments and spectroscopic factors have been deduced for 46 levels up to an excitation energy of 3.7 MeV in ${}_{}{}^{141}{}_{}{}^{}\mathrm{Ce}$ by comparison with zero-range distorted-wave Born approximation calculations. We note that in spite of the neutron shell closure at $N=82\mathrm{}$, no ${}_{}{}^{141}{}_{}{}^{}\mathrm{Ce}$ state has a spectroscopic factor in excess of 0.80. All neutron states are fragmented and considerable spectroscopic strength for $l=1\mathrm{} \mathrm{and} 3$ is spread up to and above 3 MeV. Two well resolved fragments each for the $h_{\frac{9}{2}}$ and $i_{\frac{13}{2}}$ states very nearly fill the sum rules for these single-particle states. The structure of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Ce}$ levels below 2 MeV is well reproduced by the unified model calculations of Heyde, Waroquier, and Vincx.