Systematic reduction of the proton-removal cross section in neutron-rich medium-mass nuclei
oleh: J. Díaz-Cortés, J. Benlliure, J.L. Rodríguez-Sánchez, H. Álvarez-Pol, T. Aumann, C.A. Bertulani, B. Blank, E. Casarejos, D. Cortina-Gil, D. Dragosavac, V. Föhr, A. Gargano, M. Gascón, W. Gawlikowicz, A. Heinz, K. Helariutta, A. Kelić-Heil, S. Lukić, F. Montes, D. Pérez-Loureiro, L. Pieńkowski, K.-H. Schmidt, M. Staniou, K. Subotić, K. Sümmerer, J. Taieb, A. Trzcińska
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2020-12-01 |
Deskripsi
Single-neutron and single-proton removal cross sections have been measured for medium-mass neutron-rich nuclei around Z=50 and energies around 1000A MeV using the FRagment Separator (FRS) at GSI. The measured cross sections confirm the relative low values of the proton-removal cross sections, observed since a long time ago and not yet understood. Model calculations considering the knock-out process together with initial- and final-state interactions describe the measured neutron-removal cross sections. Proton-removal cross sections are, however, significantly over-predicted by the same calculations. The observed difference can be explained to a large extent by the knock-out of short-range correlated nucleons from dominant neutron-proton pairs in neutron-rich nuclei.