Determination of Ne 20 ( p , γ ) Na 21 cross sections from E p = 500 - 2000 keV

Lyons, S.; Görres, J.; deBoer, R. J.; Stech, E.; Chen, Y.; Gilardy, G.; Liu, Q.; Long, Alexander Makenzie; Moran, M.; Robertson, D.; Seymour, C.; Vande Kolk, B.; Wiescher, M.; Best, A.

doi:10.1103/physrevc.97.065802

Title: Determination of ${}^{20}{Ne} (p, γ) {}^{21}{Na}$ cross sections from $E_{p} = 500 - 2000 keV$

Journal Article · Tue Jun 05 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.97.065802· OSTI ID:1659167

Lyons, S. ^[1]; Görres, J. ^[2]; deBoer, R. J. ^[2]; Stech, E. ^[2]; Chen, Y. ^[2]; Gilardy, G. ^[2]; Liu, Q. ^[2];

^[3]; Moran, M. ^[2]; Robertson, D. ^[2]; Seymour, C. ^[2]; Vande Kolk, B. ^[2]; Wiescher, M. ^[2]; Best, A. ^[4]

Univ. of Notre Dame, IN (United States). Joint Inst. for Nuclear Astrophysics; Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Univ. of Notre Dame, IN (United States). Joint Inst. for Nuclear Astrophysics
Univ. of Notre Dame, IN (United States). Joint Inst. for Nuclear Astrophysics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. Federico II and INFN Sezione di Napoli, Naples (Italy). Joint Inst. for Nuclear Astrophysics

Background: The reaction ²⁰Ne(p,γ) ²¹Na influences the nucleosynthesis of Ne, Na, and Mg isotopes while contributing to hydrogen burning in several stellar sites, such as red giants, asymptotic giant branch (AGB) stars, massive stars, and oxygen-neon (ONe) novae. In the relevant temperature range for these environments (T = 0.05–0.5 GK), the main contributions to this reaction rate are from the direct capture process as well as the high-energy tail of a subthreshold resonance in the ground-state transition at E_x = 2425 keV in the ²¹Na compound nucleus. Purpose: The previous measurement of this reaction reports cross sections with large uncertainties for the ground-state transition. At higher energies, where the subthreshold resonance makes a smaller contribution to the total cross section, only upper limits are provided. This work aims to reduce the uncertainty in the cross section where direct capture dominates, as well as provide cross-section data in previously unmeasured regions. Method: The ²⁰Ne (p, γ) ²¹Na reaction was measured over a wide proton energy range (E_p = 0.5–2.0 MeV) at θ_lab = 90°. Transitions to the ground state and to the 332 and 2425 keV excited states were observed. The primary transitions to these three bound states were utilized in an R -matrix analysis to determine the contributions of the direct capture and the subthreshold resonance to the total cross section. Results: The cross sections of the present measurements have been found to be in good agreement with the previous data at low energy. Significantly improved cross-section measurements have been obtained over the E_p = 1300–1900 keV region. The narrow resonance at E_c.m. = 1113 keV (E x = 3544.3 keV) has also been remeasured and its strength has been found to be in good agreement with previous measurements. Conclusions: An extrapolation of the S factor of ²⁰Ne (p, γ) ²¹Na has been made to low energies using the R -matrix fit. The reaction rate from the subthreshold resonance was found to be the main contributor to the reaction rate at temperatures below about 0.1 GK. The present rate is lower in the temperature range of interest than those presented in current reaction rate libraries by up to 20%.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Krell Institute, Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001; FC52-08NA28752; Phys-0758100; Phys-0822648; PHY-1430152

OSTI ID:: 1659167

Alternate ID(s):: OSTI ID: 1440381

Report Number(s):: LA-UR-17-31505; TRN: US2203394

Journal Information:: Physical Review C, Vol. 97, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Determination of ${}^{20}{Ne} (p, γ) {}^{21}{Na}$ cross sections from $E_{p} = 500 - 2000 keV$