Effects of the in-medium NN interaction on total reaction and neutron removal cross sections

Abstract

We discuss calculations of total reaction cross sections between complex nuclei, R , using optical limit and few-body Glauber models in which the free nucleon-nucleon cross sections NN are replaced by their reduced values in the nuclear medium. This replacement lowers R by at most a few percent when NN is determined from the local matter density in each overlapping volume element of the significant projectile-target trajectories. This relatively small effect contrasts with reductions of about 10% in R reported by Xiangzhou et al., who assume a global value for the matter density throughout the interaction region. For two-neutron halo nuclei, we investigate the significance of these in-medium effects for the neutron-removal cross sections, 2n . We show that use of an in-medium NN raises 2n for 6He but lowers it for 11Li, because of their different halo sizes.

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