Investigation of the dipole response of nickel isotopes in the presence of a high-frequency electromagnetic field [Elektronische Ressource] / Dominic M. Rossi

Investigation of the Dipole Response of NickelIsotopes in the Presence of a High-FrequencyElectromagnetic FieldDissertationzur Erlangung des Grades”Doktor der Naturwissenschaften”im Promotionsfach Chemieam Fachbereich Chemie, Pharmazie und Geowissenschaftender Johannes Gutenberg-Universit¨at MainzDominic M. Rossigeboren in Stanford, CA, USAMainz, 2009Dekan:1. Berichterstatter:2. Berichterstatter:Tag der mu¨ndlichen Pru¨fung: 25.01.2010D77Labor omnia vicit improbusVirgil, Georgica I (v. 145-146)AbstractThe electric dipole response of neutron-rich nickel isotopes has been investigatedusing the LAND setup at GSI in Darmstadt (Germany). Relativistic secondary beams56−57 67−72of Ni and Ni at approximately 500 AMeV have been generated using projectile2fragmentation of stable ions on a 4 g/cm Be target and subsequent separation in themagnetic dipole fields of the FRagment Separator (FRS). After reaching the LANDsetup in Cave C, the radioactive ions were excited electromagnetically in the electricfield of a Pb target. The decay products have been measured in inverse kinematics using67−69various detectors. Neutron-rich Ni isotopes decay by the emission of neutrons,which are detected in the LAND detector. The present analysis concentrates on the(γ,n) and (γ,2n) channels in these nuclei, since the proton and three-neutron thresholdsare unlikely to be reached considering the virtual photon spectrum for nickel ions at58500 AMeV.