Speaker
Dr
Konrad Schmidt
(National Superconducting Cyclotron Laboratory, East Lansing, MI, USA)
Description
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{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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\TITLE{X-ray burst studies with the JENSA gas jet target}\\[3mm]
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\AUTHORS{
\underline{K. Schmidt}$^{1,2}$,
K.\,A. Chipps$^{3}$,
S. Ahn$^{1,2}$,
J.\,M. Allen$^{4}$,
D.\,W. Bardayan$^{4}$,
J.\,C. Blackmon$^{5}$,
D. Blankstein$^{4}$,
J. Browne$^{1,6}$,
S.\,M. Cha$^{7}$,
K.\,Y. Chae$^{7}$,
J. Cizewski$^{8}$,
C.\,M. Deibel$^{5}$,
O. Gomez$^{9}$,
U. Greife$^{10}$,
U. Hager$^{1,6}$,
M.\,R. Hall$^{4}$,
K.\,L. Jones$^{11}$,
A. Kontos$^{12}$,
R.\,L. Kozub$^{13}$,
E.\,J. Lee$^{7}$,
A. Lepailleur$^{8}$,
L.\,E. Linhardt$^{5}$,
M. Matos$^{14}$,
Z. Meisel$^{15}$,
F. Montes$^{1}$,
P.\,D. O'Malley$^{4}$,
W-J. Ong$^{1,6}$,
S.\,D. Pain$^{3}$,
A. Sachs$^{11}$,
H. Schatz$^{1,2,6}$,
K.\,T. Schmitt$^{11}$,
K. Smith$^{11}$,
M.\,S. Smith$^{3}$,
N.\,F. Soares de Bem$^{13,16}$,
P.\,J. Thompson$^{11}$,
R. Toomey$^{8,17}$,
and D. Walter$^{8}$
}
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{\small \it
\AFFILIATION{1}{National Superconducting Cyclotron Laboratory, East Lansing, MI, USA}
\AFFILIATION{2}{JINA Center for the Evolution of the Elements, East Lansing, MI, USA}
\AFFILIATION{3}{Oak Ridge National Laboratory, Oak Ridge, TN, USA}
\AFFILIATION{4}{University of Notre Dame, Notre Dame, IN, USA}
\AFFILIATION{5}{Louisiana State University, Baton Rouge, LA, USA}
\AFFILIATION{6}{Michigan State University, East Lansing, MI, USA}
\AFFILIATION{7}{Sungkyunkwan University, Suwon, South Korea}
\AFFILIATION{8}{Rutgers University, Piscataway, NJ, USA}
\AFFILIATION{9}{Florida International University, Miami, FL, USA}
\AFFILIATION{10}{Colorado School of Mines, Golden, CO, USA}
\AFFILIATION{11}{University of Tennessee, Knoxville, TN, USA}
\AFFILIATION{12}{Massachusetts Institute of Technology, Cambridge, MA, USA}
\AFFILIATION{13}{Tennessee Technological University, Cookeville, TN, USA}
\AFFILIATION{14}{International Atomic Energy Agency, Vienna, Austria}
\AFFILIATION{15}{Ohio University, Athens, OH, USA}
\AFFILIATION{16}{Federal Center for Technological Education of Minas Gerais, Brazil}
\AFFILIATION{17}{University of Surrey, Guildford, England, UK}
}
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\centerline{Contact email: {\it schmidtk@nscl.msu.edu}}
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When a neutron star accretes hydrogen and helium from the outer layers of its companion star, thermonuclear burning processes enable the $\alpha$p-process as a break out mechanism from the hot CNO cycle. X-ray burst models predict ($\alpha$,\,p) reaction rates to significantly affect light curves of X-ray bursts and elemental abundances in the burst ashes.
The Jet Experiments in Nuclear Structure and Astrophysics (JENSA) gas jet target [1] enables the direct measurement of previously inaccessible ($\alpha$,p) reactions with radioactive beams provided by the rare isotope re-accelerator ReA3 at the National Superconducting Cyclotron Laboratory (NSCL), USA. JENSA is going to be the main target for the recoil separator for capture reactions (SECAR) at the Facility of Rare Isotope Beams (FRIB). Commissioning and first experiments at Oak Ridge National Laboratory (ORNL) showed a highly localized, pure gas target with a density of about $10^{19}$ atoms per square centimeter.
Preliminary results will be presented from a commissioning experiment at NSCL studying the $^{14}$N($\alpha$,\,p)$^{17}$O reaction and from the first direct cross section measurement of the $^{34}$Ar($\alpha$,\,p)$^{37}$K reaction.
This research is supported by the National Science Foundation in part under Grant No. PHY-1430152 (JINA Center for the Evolution of the Elements), Grant No. PHY-1419765, Grant No. PHY-1404218, by the U.\,S. Department of Energy, Office of Nuclear Physics, and by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for DoE.
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{\small
\noindent [1] K.\,A. Chipps \emph{et al.}, Nucl. Instrum. Methods Phys. Res. Sect. A \textbf{763}, 553 (2014).
}
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Primary author
Dr
Konrad Schmidt
(National Superconducting Cyclotron Laboratory, East Lansing, MI, USA)
