Violation of Seniority in the ReactionCa43(d,p)Ca44

Abstract

The reaction ${}_{}{}^{43}{}_{}{}^{}\mathrm{Ca}\mathrm{}(d,p)\mathrm{}{}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ has been studied at 8.50- and 4-MeV bombarding energies. In the higher energy experiment, proton angular distributions were measured for 31 transitions, by means of the Aldermaston multiangle spectrograph. The $l_n$ values and spectroscopic strengths were obtained from a distorted-wave analysis of the angular distributions. Energy levels were determined in the 4-MeV experiment by detecting the protons in the Copenhagen heavy-particle spectrograph. A ground-state $Q$ value of 8920±10 keV was obtained. The spectroscopic strengths were analyzed in terms of the non-energy-weighted sum rules for multipole orders $\lambda =0,1,\mathrm{and} 2$. Eight $f_{\frac{7}{2}}$ transitions were observed, compared with four predicted by the seniority-coupling scheme.