Spectroscopic strength reduction of intermediate-energy single-proton removal from oxygen isotopes

Measurements of inclusive single-proton removal cross sections from a variety of oxygen isotopes incident at intermediate energies are collected to be compared with Glauber reaction model predictions using shell-model spectroscopic factors between the initial projectile ground state and configurations of the bound core state+valence proton orbit. The collection of data includes a long oxygen isotopic chain spanning over O13-20 and O-22 with relatively high beam energies of 305-635MeV/nucleon, which facilitates a probe into the reaction-model origin of the dependence of the spectroscopic strength reduction factor R-s (the ratio of the experimental over theoretical single-nucleon removal cross sections) on the binding depth Delta S of the removed nucleon, as high beam energies enhance the applicability of the eikonal and sudden approximation that underlie the Glauber model. Our analysis gives R-s values that largely conform to the former R-s-Delta S systematics established upon data mainly over beam energies of 80-240 MeV/nucleon, yet with a slightly dampened R-s-Delta S dependence, and also signs of an odd-even staggering of R-s with respect to the projectile mass number A.