The <sup>17</sup>F(α, p)<sup>20</sup>Ne Reaction Rate in Type I X-Ray Bursts from the Inverse Reaction
ORAL
Abstract
The 17F(α, p)20Ne reaction has been identified as an alternate pathway for
breakout from the hot-CNO cycle that can be important in some X-ray burst
scenarios. We have previously measured the 20Ne(p, α)17F cross section at low
center-of-mass energies ranging from 4.80 to 7.60 MeV via activation
measurements with a proton beam on a 20Ne gas cell at the Fox Accelerator
Laboratory at Florida State University. We subsequently measured the same
reaction through inverse kinematics with a 20Ne beam on a methylene target
at Argonne National Lab’s ATLAS facility. We used an annular Si strip
detector for alpha-particle detection with recoiling heavy ions detected in the
Enge spectrograph by the MONICA focal plane detector. Studying the
reaction in inverse kinematics allows us to distinguish alpha particles emitted
to the first-excited state of 17F which do not contribute to the reverse (α, p)
reaction on the 17F ground state. Cross section comparisons and preliminary
results from an R-matrix analysis constraining properties of states in 21Na will
be presented.
breakout from the hot-CNO cycle that can be important in some X-ray burst
scenarios. We have previously measured the 20Ne(p, α)17F cross section at low
center-of-mass energies ranging from 4.80 to 7.60 MeV via activation
measurements with a proton beam on a 20Ne gas cell at the Fox Accelerator
Laboratory at Florida State University. We subsequently measured the same
reaction through inverse kinematics with a 20Ne beam on a methylene target
at Argonne National Lab’s ATLAS facility. We used an annular Si strip
detector for alpha-particle detection with recoiling heavy ions detected in the
Enge spectrograph by the MONICA focal plane detector. Studying the
reaction in inverse kinematics allows us to distinguish alpha particles emitted
to the first-excited state of 17F which do not contribute to the reverse (α, p)
reaction on the 17F ground state. Cross section comparisons and preliminary
results from an R-matrix analysis constraining properties of states in 21Na will
be presented.
*Work supported by U.S. Dept of Energy via Award DE-FG02-96ER40978,National Science Foundation via Award NSF-PHY 2012522, and by theLouisiana Board of Regents.This research used resources of ANL’s ATLAS facility, which is a DOE Officeof Science User Facility
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Presenters
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William D Braverman
- Louisiana State University