The cross sections (${\sigma }_{\mathrm{th}}$) of one-proton removal from ${}^{10-13,15}\mathrm{B}$ and ${}^{12-16,18}\mathrm{C}$ near $400\text{MeV/nucleon}$ are calculated using Glauber model with shell-model spectroscopic factors as structural inputs, and compared with the corresponding experimental measurements ${\sigma }_{\exp }$. The reduction factors of the spectroscopic strengths $R_{\mathrm{s}}={\sigma }_{\exp }/{\sigma }_{\mathrm{th}}$ plotted against the nucleon separation energy difference $\mathrm{\Delta }S=S_p-S_n$ of the projectile largely conform to the former $R_{\mathrm{s}}\text{−}\mathrm{\Delta }S$ systematics established upon one-nucleon removal data mainly over beam energies of $100–240\text{MeV/nucleon}$, yet with signs of a dampened $R_{\mathrm{s}}\text{−}\mathrm{\Delta }S$ dependence for boron isotopes and an odd-even staggering of $R_{\mathrm{s}}$ with projectile mass number $A$ for carbon isotopes. With the linear representation of the $R_{\mathrm{s}}\text{−}\mathrm{\Delta }S$ systematics $R_{\mathrm{s}}\left(\mathrm{\Delta }S\right)=0.61–0.016\mathrm{\Delta }S\pm 0.1$ given by Tostevin and Gade, we have also tried applying $R_{\mathrm{s}}\left(\mathrm{\Delta }S\right)$ to a phenomenological correction of ${\sigma }_{\mathrm{th}}$. The $R_{\mathrm{s}}\left(\mathrm{\Delta }S\right)$-corrected cross sections ${\sigma }_{\mathrm{th}}^{\mathrm{cor}}=R_{\mathrm{s}}\left(\mathrm{\Delta }S\right)·{\sigma }_{\mathrm{th}}$ demonstrate a much higher overall predictive power than the empirical parametrizations EPAX 2, EPAX 3, and FRACS.

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• Direct reactions
• Spectroscopic factors & electromagnetic moments
• 6 ≤ A ≤ 19
• Nuclear data analysis & compilation
• Radioactive beams
• Shell model