Unique features in the Oak Ridge Isochronous Cyclotron

ISOL science at the Holifield Radioactive Ion Beam Facility

“…• Kinetic ejection negative ion source (KENIS) [8]. This source was developed to produce intense beams of radioactive halogen isotopes with a primary emphasis on the production of 17 F and 18 F beams. These chemically active atomic species stick tenaciously to essentially any material they encounter including walls of the target, and transfer tube.…”

“…The KENIS source combines molecular transport of the halogen atoms with dissociation of the molecule and negative ionization of the halogen component by Cs ion bombardment. A unique HfO 2 fiber target (described later) has been developed for use in this source with the reactions 16 O(d, n) 17 F and 16 O(α, pn) 18 F. Aluminum vapor is introduced into the target region by adding Al 2 O 3 to the target material. The fluorine atoms combine with Al to form relatively inert AlF molecules.…”

“…The ORIC is a cyclic particle accelerator, completed in 1962 [18], which operates at the cyclotron resonance between an applied static magnetic field and an RF electric field at a fixed frequency. The ORlC was designed for the acceleration of both light and heavy ions.…”

“…Now, with the development of intense reaccelerated beams of radioactive nuclei, it is possible to make direct measurements of proton-induced cross sections far from stability and thus calibrate this flow to heavier elements. At the HRIBF, direct measurements of the 18 F(p, α) 15 O and 17 F(p, γ ) 18 Ne reaction cross sections have been made. The most important resonance in each reaction was directly calibrated for the first time by bombarding hydrogen targets with radioactive 17,18 F beams [59,60].…”

“…Highlights from the HRIBF include the first acceleration of neutron-rich fission fragments along with the ability to produce high purity beams of doubly magic 132 Sn, pioneering experiments using Coulomb excitation reactions, g-factor measurements using the recoil-in-vacuum technique, decay studies with post-accelerated purified beams of fission fragments, transfer studies in inverse kinematics using neutron-rich RIBs, fusion-evaporation measurements using neutron-rich beams, reactions with proton-rich isotopes, such as 17 F and 18 F, which are important to the break out of the CNO cycle and explosive nucleosynthesis, and the development of techniques and equipment optimized to research with RIBs.…”