Study of proton resonances in 18 Ne via resonant elastic scattering of 17 F+p and its astrophysical implication

The proton resonant properties in 18 Ne, which determine the reaction rate of the key stellar 14 O(α,p) 17 F reaction, have been studied by using a technique of proton resonant elastic scattering of 17 F+p. A 4.22 MeV/nucleon 17 F radioactive ion (RI) beam was produced via a projectile-fragmentation reaction, and separated by a Radioactive Ion Beam Line in Lanzhou (RIBLL). By bombarding a thick (C H 2) n target, the energy spectra of the recoiled protons were measured by two Δ E - E silicon telescopes at the center-of-mass scattering angles of θ c.m. ≈175°±5°, θ c.m. ≈152°±8°, respectively. Several proton resonances in 18 Ne were observed clearly. A further R-matrix analysis of the experimental data is under way to determine the resonant parameters. The present work reports the preliminary results briefly.