2010/09/07 by J. Hu, J. J. He, Hu, J. +73
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Solar and Stellar Astrophysics (astro-ph.SR) #astro-ph.SR #nucl-ex
paper · pdf · doi:10.48550/arxiv.1009.1206
8 figures, 2 tables
arxiv created 2010/09/07 · arxiv updated 2010/09/08
Properties of proton resonances in 18Ne have been investigated efficiently by utilizing a technique of proton resonant elastic scattering with a 17F radioactive ion (RI) beam and a thick proton target. A 4.22~MeV/nucleon 17F RI beam was produced via a projectile-fragmentation reaction, and subsequently separated by a Radioactive Ion Beam Line in Lanzhou (\tt RIBLL). Energy spectra of the recoiled protons were measured by two sets of ΔE-E silicon telescope at center-of-mass scattering angles of θc.m.≈175^∘±5^∘, θc.m.≈152^∘±8^∘, respectively. Several proton resonances in 18Ne were observed, and their resonant parameters have been determined by an R-matrix analysis of the differential cross sections in combination with the previous results. The resonant parameters are related to the reaction-rate calculation of the stellar 14O(α,p)17F reaction, which was thought to be the breakout reaction from the hot CNO cycles into the rp-process in x-ray bursters. Here, Jπ=(3-, 2-) are tentatively assigned to the 6.15-MeV state which was thought the key 1- state previously. In addition, a doublet structure at 7.05 MeV are tentatively identified, and its contribution to the resonant reaction rate of 14O(α,p)17F could be enhanced by at least factors of about 4∼6 in comparison with the previous estimation involving only a singlet. The present calculated resonant rates are much larger than those previous values, and it may imply that this breakout reaction could play a crucial role under x-ray bursters conditions.