出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The rate of the 17F(p,g)18Ne reaction is of significant importance in astrophysical events like
novae and x-ray bursts. The decay of 17F is thought to help drive the expansion of the nova
envelope, and the 17F(p,g)18Ne reaction affects the production of 18F, a target of gamma-ray
astronomy, as well as being an important link in the (a,p) reaction chain during the ignition phase
of x-ray bursts. A 3+ state in 18Ne predicted to dominate the rate was found at 599.8 keV using
the 17F(p,p)17F reaction [1], but the resonance strength was unknown. For the first time, the
17F(p,g)18Ne reaction has been measured directly with the Daresbury Recoil Separator, using a
mixed beam of radioactive 17F and stable 17O from the Holifield Radioactive Ion Beam Facility
at Oak Ridge National Laboratory. A g width was found for the 599.8 keV resonance in 18Ne,
and an upper limit on the direct capture S factor was determined at an intermediate energy of 800
keV.
