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The 18Ne(α,p)21Na reaction is one candidate of the breakout reactions from hot-CNO cycle, and it plays an important role in understanding the X-ray bursts and the nucleosynthesis in the rp-process. We investigated energy levels of the compound nucleus 22Mg by measuring the 18Ne(α,α)18Ne resonant scattering in inverse kinematics. The 18Ne rare isotope beam was produced at the CNS Radio-Isotope Beam Separator (CRIB) of Center for Nuclear Study, the University of Tokyo, located at the RIBF of RIKEN Nishina Center, and recoiling α particles were measured by silicon detector telescopes. The excitation function of 18Ne+ α (scattering) was obtained for the excitation enregy region of 22Mg in Ex = 11 – 16 MeV by adopting a thick target method. In order to investigate the energy level properties of 22Mg, the experimental excitation function was compared with theoretical R-matrix analysis using the SAMMY8 code. The cross section was evaluated in the astrophysically-important energy range, and the 18Ne(α,p)21Na reaction rate was estimated based on a possible strong resonance at Ex =10.890 MeV.
| Please select a main topic related to your abstract | Experimental Nuclear Physics for Astrophysics |
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