Resonance reactions induced by beams of light radioactive nuclei

In the analysis of the experimental studies reported in this thesis, three light nuclei were investigated via resonance elastic scattering using the Thick Target Inverse Kinematics technique (TTIK). All of those results were published or submitted to scientific journals.

The structure of the unbound proton-rich isotope 19Na was studied in resonance elastic scattering of a radioactive 18Ne beam on a proton target. The experiment covered the excitation energy range from 0.5 to 2.7 MeV in the center-of-mass system. Only one state of 19Na (the second excited state) was observed. A combined R-matrix and potential model analysis was performed. The spin and parity assignment of this second excited state was confirmed to be 1/2+. It was shown that the position of the 1/2+ state significantly affects the reaction rate through that state, but the total reaction rate remains unchanged since the 18Ne(2p,gamma) proceeds mostly via the ground and first excited states in 19Na at stellar temperatures.

An excitation function of 12N+p was measured in the center of mass energy range of 0.8 - 2.7 MeV. The data were analyzed in the framework of the R-matrix formalism. A spin-parity assignment is given for the first excited state of 13O. An indication of the presence of a new level in 13O at an excitation energy of 3.29 MeV, with tentative spin-parity assignment (1/2-, 3/2-), was obtained. The impact of this measurement on the 12N(p,gamma)13O reaction rate is discussed.

An excitation function has been measured for 12B+p elastic scattering in the excitation-energy region from 18.5 to 21.0 MeV in 13C. Five new states were found, and evidence is presented for a T = 3/2 assignment to all of them. No anomalies related to the possible manifestation of T = 1/2 states in the region were observed. The properties of the new states are in reasonably good agreement with shell-model predictions. A comparison with the 13B level scheme shows that even more T = 3/2 states should be present in the region under investigation.