Neutron-rich Nuclei at and Beyond the Dripline in the Range Z=4 to Z=10 Studied in Kinematically Complete Measurements of Direct Reactions at Relativistic Energies

Abstract

We propose to study light neutron-rich nuclei (Z=4 to Z=10) utilizing kinematically complete measurements of reactions at relativistic energies with the LAND/R3B reaction setup at Cave C. The physics topics to be studied comprise the measurement of astrophysical reaction rates relevant for r-process nucleosynthesis using heavy-ion induced electromagnetic excitation and quasi-free knockout reactions to study the evolution of shell and cluster structures close to and beyond the dripline. Concerning the latter topic, the evolution of neutron shells is studied in (p,pn) reactions and the evolution of alpha clustering in the ground states of Be isotopes as a function of increasing neutron number is investigated in (p,p) reactions. Unbound (ground and excited) states will be populated and identified in (p,2p) reactions. Finally, the quenching of single-particle strength in neutron-proton asymmetric nuclei will be addressed by knocking out deeply bound protons and neutrons in (p,2p) and (p,pn) reactions for nuclei with varying neutron-proton asymmetry. The same setup will be used for all reactions making very efficient use of the allocated beam time. In total, we ask for 21 days of beam time.