EURORIB'15

Quasi-free knockout reactions in inverse kinematics offer great opportunities to probe the mean-field properties of imbalanced nuclei. We have developed a reaction model for quasi-free A(p, pN )B reactions with unstable nuclei. Such a model makes it possible to connect experimental data from (p, pN ) measurements in inverse kinematics at radioactive-beam facilities [1], to the mean-field properties (spectroscopic factors and single-particle wave functions). The cross sections are calculated in a factorised way, following the approach developed in Refs. [2] and [3]. The general idea in this approach is to calculate the hard scattering part as a free pN scattering cross section with a phase-space correction, multiplied by the momentum probability distribution for the struck nucleon. To incorporate the effect of the soft initial- and final-state interactions, a Relativistic Multiple Scattering Glauber Approximation (RMSGA) is used [3]. In the RMSGA, these soft interactions are calculated in an eikonal approximation using the free scattering cross sections. The role of charge-exchange effects is computed in a semi-classical way. The single-particle wave functions used to calculate the momentum distributions are from a mean-field shell-model calculation. The results of the model are compared to the momentum distributions obtained at the HIMAC accelerator in the National Institute of Radiological Sciences in Chiba, Japan [4]. In this experiment, the momentum distributions for (p, 2p) Reactions on 9−16C isotopes at 250 MeV/A were measured for the knock-out of both s-state and p-state protons. By comparing the theoretical cross sections to these distributions, we can study the evolution of the shell-model parameters as a function of Z/N . The model that is developed can serve to analyse the resulting data from experiments with relativistic radioactive beams [1] conducted at GSI. References [1] T. Aumann, Prog. Part. Nucl. Phys. 59 (2007) 3. [2] T. Aumann, C.A. Bertulani and J. Ryckebusch, Phys. Rev. C 88 (2013) 064610. [3] B. Van Overmeire, W. Cosyn, P. Lava, and J. Ryckebusch, Phys. Rev. C 73 (2006) 064603. [4] T. Kobayashi, K. Ozeki, K. Watanabe, Y. Matsuda, Y. Seki, T. Shinohara, T. Miki and Y. Naoi et al., Nucl. Phys. A 805 (2008) 431.