Newly published ${}^{42}$Si $\gamma$-ray spectra and a final-state-inclusive ${}^{42}$Si production cross section value, obtained in a higher-statistics intermediate-energy two-proton removal experiment from ${}^{44}$S, are considered in terms of the final-state-exclusive cross sections computed using proposed shell-model effective interactions for nuclei near $N=28$. Specifically, we give cross section predictions when using the two nucleon amplitudes of the two-proton overlaps ${\langle }^{42}$Si$\left(J^{\pi }\right)|{}^{44}$S$\rangle$ computed using the newly proposed sdpf-mu shell-model Hamiltonian. We show that these partial cross sections or their longitudinal momentum distributions should enable a less-tentative interpretation of the measured gamma-ray spectra and provide a more quantitative assessment of proposed shell-model Hamiltonians in this interesting and challenging region of the chart of nuclides.

• Received 15 November 2012

DOI:https://doi.org/10.1103/PhysRevC.87.027601