Speaker
Dr
Michael Febbraro
(Oak Ridge National Laboratory)
Description
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{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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\TITLE{An above-ground low-energy measurement of the dominant s-process neutron source: $^{13}$C($\alpha$,n)$^{16}$O}\\[3mm]
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\AUTHORS{M. Febbraro$^{1}$, S.D. Pain$^{1}$, R. Toomey$^{2,3}$, M. Bannister$^{1}$, R.J. deBoer$^{4}$, K.A. Chipps$^{1}$,\\ C.C. Havener$^{1}$, W.A. Peters$^{1,5}$, M.S. Smith$^{1}$, K. Smith$^{5}$, and D. Walter$^{3}$}
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\AFFILIATION{1}{Oak Ridge National Laboratory, Oak Ridge, TN, USA}
\AFFILIATION{2}{University of Surrey, Guildford, UK}
\AFFILIATION{3}{Rutgers University, Piscataway, NJ, USA}
\AFFILIATION{4}{University of Notre Dame, Notre Dame, IN, USA}
\AFFILIATION{5}{University of Tennessee, Knoxville, TN, USA}
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\centerline{Contact email: {\it febbraro@umich.edu}}
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The $^{13}$C($\alpha$,n)$^{16}$O reaction serves as the dominant source of the neutrons for the slow neutron capture (s-process). Approximately half of the elements from Fe to Bi along the line of $\beta$ stability are synthesized via stellar nucleosynthesis in asymptotic giant branch stars. Previous measurements are thought to have exhausted above-ground attempts to measure this important cross section near the Gamow window[1]. Presently there is a worldwide effort at many current and future underground laboratories to continue these measurements in a low background environment. In this study, we will present on a recent above-ground measurement using a novel dual readout liquid scintillator approach performed at the Multicharged Ion Research Facility (MIRF) located at Oak Ridge National Laboratory. An ECR ion source located on a 250 kV high voltage platform produced $\sim$ 100 e$\mu$A of He$^{2+}$ which was incident on isotropically enriched implanted $^{13}$C targets. The measurement was performed using position sensitive liquid scintillator bar-type detectors configured in a barrel array. The use of such detectors permits a quasi-spectroscopic approach where events can be gated according to their recoil ion spectrum measured in the liquid scintillator bars. This effectively improves the signal to background by allowing for discrimination based on kinematics. The dual readout system permits further constraints on position and neutron identification on both pmts. Preliminary results from the recent measurement campaign at MIRF will be presented as well as a discussion on the advantages and challenges of this approach.
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics. Research sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy.
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\noindent [1] M. Heil, et al., Phys. Rev. C 78 025803 (2008);
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Primary author
Dr
Michael Febbraro
(Oak Ridge National Laboratory)
Co-authors
Dr
Charles Havener
(Oak Ridge National Laboratory)
Mr
David Walter
(Rutgers University)
Dr
Karl Smith
(University of Tennessee)
Dr
Kelly Chipps
(Oak Ridge National Laboratory)
Dr
Mark Bannister
(Oak Ridge National Laboratory)
Dr
Michael Smith
(Oak Ridge National Laboratory)
Mrs
Rebecca Toomey
(University of Surrey, Rutgers University)
Dr
Richard deBoer
(University of Notre Dame)
Dr
Steven Pain
(Oak Ridge National Laboratory)
Dr
William Peters
(Oak Ridge National Laboratory, University of Tennessee)
