Spectroscopic strength reduction of one-proton removal from neutron-rich boron and carbon isotopes near 400 MeV/nucleon

The cross sections (σₜₕ) of one-proton removal from ^10-13,15B and ^12-16,18C near 4000.222222em0exMeV/nucleon are calculated using Glauber model with shell-model spectroscopic factors as structural inputs, and compared with the corresponding experimental measurements σₑₓₚ. The reduction factors of the spectroscopic strengths Rₛ=σₑₓₚ/σₜₕ plotted against the nucleon separation energy difference ΔS=Sₚ-Sₙ of the projectile largely conform to the former Rₛ-ΔS systematics established upon one-nucleon removal data mainly over beam energies of 100--2400.222222em0exMeV/nucleon, yet with signs of a dampened Rₛ-ΔS dependence for boron isotopes and an odd-even staggering of Rₛ with projectile mass number A for carbon isotopes. With the linear representation of the Rₛ-ΔS systematics Rₛ(ΔS)=0.61--0.016ΔS0.16em0ex±0.1 given by Tostevin and Gade, we have also tried applying Rₛ(ΔS) to a phenomenological correction of σₜₕ. The Rₛ(ΔS)-corrected cross sections σₜₕᶜᵒʳ=Rₛ(ΔS)·σₜₕ demonstrate a much higher overall predictive power than the empirical parametrizations EPAX 2, EPAX 3, and FRACS.