Investigation of the reaction Ne(p, γ)Na in the astrophysical interesting energy region

The nuclear reaction Ne(p, γ)Na has been investigated in the astrophysical interesting energy region from Ep = 600 keV to Ep = 1400 keV. Furthermore several resonances of the reaction Al(p, γ)Si have been measured in an energy range of Ep = 400 keV to Ep = 1400 keV to determine the calibration and efficiency of the detector setup. The experiments and corresponding measurements have been performed at the Nuclear Structure Laboratory of the University of Notre Dame with the Van-de-Graaff accelerators KN and JN. Implanted or evaporated Ne, respectively Al beamstop targets have been bombarded with protons, and the induced reactions have been investigated. For the γ-spectroscopic measurements a Ge-detector and a pair of NaI-detectors have been used in 3 different setups. The first setup included the positioning of the Ge-detector in an angle of 0 to the target. Here the Ge-detector and the target were surrounded completly by a pair of NaI-detectors. For the second setup the NaI-detectors have been moved forward, so that the target was at the end of the NaI-detector annulus with the Ge-detectors positioned at 0. The difference between the second and the third setup is the mounting of a 45 target chamber and correspondingly the rotating of the Ge-detector. For each setup, the NaI-detectors have been used as Vetodetectors to realize a cosmic background and a Compton continuum rejection. To determine the setup with the best efficiency, several resonances of the reaction Al(p, γ)Si have been measured and investigated. Especially the behavior of the efficiency considering coincidencesumming has been taken into account. Setup 1 has shown the best rejection while Setup 3 had the highest yields and was therefore chosen to measure the reaction Ne(p, γ)Na. In our measurements, the resonance strength ωγ for the Ne(p, γ)Na resonance at Ep = 1169 keV could be determined to a value of :