Speaker
Dr
Richard deBoer
(University of Notre Dame)
Description
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{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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\TITLE{Background $(\alpha,n)$ reactions at low energies: $^{10,11}$B$(\alpha,n)^{13,14}$N }\\[3mm]
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\AUTHORS{R.J.~deBoer$^{1,2}$, Q.~Liu$^{1,2}$, M.~Febbraro$^{3}$, S.D.~Pain$^{3}$, R.~Toomey$^{3,4}$, and M.~Wiescher$^{1,2}$ }
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\AFFILIATION{1}{The Joint Institute for Nuclear Astrophysics}
\AFFILIATION{2}{Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 USA}
\AFFILIATION{3}{Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA}
\AFFILIATION{4}{Rutgers University, Piscataway, New Jersey 08854, USA}
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\centerline{Contact email: {\it rdeboer1@nd.edu}}
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New underground facilities like CASPAR and LUNA-MV, which are set to begin operation in the next few years, will push $\alpha$-induced reaction measurements to record low energies. Of particular interest are the neutron-producing reactions $^{13}$C$(\alpha,n)^{16}$O and $^{22}$Ne$(\alpha,n)^{25}$Mg, which fuel the $s$ process. At low energies these cross sections are dominated by their Coulomb penetrabilities. In addition, the relative difference in Coulomb penetrabilities for $\alpha$-induced reactions on targets with different charge $Z$, is much larger than for their proton-induced counter parts. Yet already small amounts of contaminant material, of lower $Z$ than the target material of interest, have been observed to induce large background yields in proton-induced capture reactions. Therefore, the study of low $Z$ background reactions is critical for both the planning and interpretation of future low energy measurements of the $^{13}$C$(\alpha,n)^{16}$O and $^{22}$Ne$(\alpha,n)^{25}$Mg reactions. This is especially true if a counter type detector will be used, e.g. $^3$He, that is insensitive to neutron energy. As boron is a common trace material in solid targets, and has already been observed as a contaminant in $(p,\gamma)$ measurements (e.g. [1]), this paper reports on a new study of the $^{10,11}$B$(\alpha,n)^{13,14}$N reactions. Measurements have been performed at the University of Notre Dame's Nuclear Science Laboratory using the Santa Anna 5~MV accelerator. Both a traditional $^3$He counter and a new type of deuterated scintillation detector [2], which is sensitive to the neutron energy, have been utilized.
This research was supported by the National Science Foundation through Grant No. Phys-0758100, the Joint Institute for Nuclear Astrophysics through Grant No. Phys-0822648 and PHY-1430152 (JINA Center for the Evolution of the Elements), and the Department of Energy Office of Science.
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\noindent [1] A.~Di~Leva \textit{et al.}, Phys. Rev. C {\bf 89} 015803 (2014);
\noindent [2] F.D.~Becchetti \textit{et al.}, Nucl. Instrum. Methods A{\bf 820} 112 (2016).
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Primary author
Dr
Richard deBoer
(University of Notre Dame)
Co-authors
Dr
Michael Febbraro
(Oak Ridge National Laboratory)
Prof.
Michael Wiescher
(University of Notre Dame)
Mrs
Qian Liu
(University of Notre Dame)
Ms
Rebecca Toomey
(Rutgers University)
Dr
Steven Pain
(Oak Ridge National Laboratory)
