Astrophysically important 19Ne states studied with the 2H(18F, α+15 O)n reaction

A. S. Adekola, Ohio University
D. W. Bardayan, ORNL Physics Division
J. C. Blackmon, ORNL Physics Division
C. R. Brune, Ohio University
K. Y. Chae, The University of Tennessee, Knoxville
A. E. Champagne, The University of North Carolina at Chapel Hill
C. P. Domizioli, Tennessee Technological University
U. Greife, Colorado School of Mines
Z. Heinen, Ohio University
M. J. Hornish, Ohio University
M. Johnson, Oak Ridge Assoct. Universities
K. L. Jones, Rutgers University–New Brunswick
R. L. Kozub, Tennessee Technological University
R. J. Livesay, Colorado School of Mines
Z. Ma, The University of Tennessee, Knoxville
T. N. Massey, Ohio University
B. Moazen, The University of Tennessee, Knoxville
C. D. Nesaraja, ORNL Physics Division
S. D. Pain, Rutgers University–New Brunswick
J. F. Shriner, Tennessee Technological University
J. S. Thomas, Rutgers University–New Brunswick
N. D. Smith, Tennessee Technological University
M. S. Smith, ORNL Physics Division
D. W. Visser, The University of North Carolina at Chapel Hill
A. V. Voinov, Ohio University


The nuclear structure of 19Ne near the proton threshold is of interest for understanding the rates of proton-induced reactions on 18F in novae. Analogues for several states in the mirror nucleus 19F have not yet been identified in 19Ne indicating the level structure of 19Ne in this region is incomplete. The 18F(d,n)19Ne and 18F(d, p)19F reactions have been measured simultaneously at Ec.m. = 14.9 MeV. The experiments were performed at the Holifield Radioactive Ion Beam Facility (HRIBF) of Oak Ridge National Laboratory (ORNL) by bombarding a 720-μg/cm2 CD2 target with a radioactive 18F beam. The 19Ne states of interest near the proton threshold decay by breakup into a and 15O particles. These decay products were detected in coincidence with position-sensitive E-ΔE silicon telescopes. The α and 15N particles from the break up of the mirror nucleus 19F were also measured with these detectors. Particle identification, coincidence, and Q-value requirements enable us to distinguish the reaction of interest from other reactions. The reconstruction of relative energy of the detected particles reveals the excited states of 19Ne and 19F which are populated. The neutron (proton) angular distributions for states in 19Ne (19F) were extracted using momentum conservation. The observed states in 19Ne and 19F will be presented. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlikeLicence.