The 18Ne(α,p)21Na breakout reaction in x-ray bursts: Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p

J. J. He, L. Y. Zhang, A. Parikh, S. W. Xu, H. Yamaguchi, D. Kahl, S. Kubono, J. Hu, P. Ma, S. Z. Chen, Y. Wakabayashi, B. H. Sun, H. W. Wang, W. D. Tian, R. F. Chen, B. Guo, T. Hashimoto, Y. Togano, S. Hayakawa, T. TeranishiN. Iwasa, T. Yamada, T. Komatsubara

研究成果: ジャーナルへの寄稿記事

17 引用 (Scopus)

抄録

The 18Ne(α,p)21Na reaction provides a pathway for breakout from the hot CNO cycles to the rp process in type-I x-ray bursts. To better determine this astrophysical reaction rate, the resonance parameters of the compound nucleus 22Mg have been investigated by measuring the resonant elastic scattering of 21Na+p. An 89 MeV 21Na radioactive ion beam was produced at the CNS Radioactive Ion Beam Separator and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled protons were measured at scattering angles of θc.m.≈175< and 152 by three ΔE-E silicon telescopes. The excitation function was obtained with a thick-target method over energies Ex(22Mg) = 5.5-9.2 MeV. The resonance parameters have been determined through an R-matrix analysis. For the first time, the Jπ values for ten states above the α threshold in 22Mg have been experimentally determined in a single consistent measurement. We have made three new Jπ assignments and confirmed seven of the ten tentative assignments in the previous work. The 18Ne(α,p)21Na reaction rate has been recalculated, and the astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the 18Ne(α,p)21Na rate significantly affects the peak nuclear energy generation rate and the onset temperature of this breakout reaction in these phenomena.

元の言語英語
記事番号012801
ジャーナルPhysical Review C - Nuclear Physics
88
発行部数1
DOI
出版物ステータス出版済み - 7 29 2013

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bursts
parity
elastic scattering
astrophysics
reaction kinetics
ion beams
x rays
separators
nuclear energy
polyethylenes
telescopes
cycles
nuclei
thresholds
protons
silicon
scattering
excitation
temperature
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

これを引用

The 18Ne(α,p)21Na breakout reaction in x-ray bursts : Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p. / He, J. J.; Zhang, L. Y.; Parikh, A.; Xu, S. W.; Yamaguchi, H.; Kahl, D.; Kubono, S.; Hu, J.; Ma, P.; Chen, S. Z.; Wakabayashi, Y.; Sun, B. H.; Wang, H. W.; Tian, W. D.; Chen, R. F.; Guo, B.; Hashimoto, T.; Togano, Y.; Hayakawa, S.; Teranishi, T.; Iwasa, N.; Yamada, T.; Komatsubara, T.

:: Physical Review C - Nuclear Physics, 巻 88, 番号 1, 012801, 29.07.2013.

研究成果: ジャーナルへの寄稿記事

He, JJ, Zhang, LY, Parikh, A, Xu, SW, Yamaguchi, H, Kahl, D, Kubono, S, Hu, J, Ma, P, Chen, SZ, Wakabayashi, Y, Sun, BH, Wang, HW, Tian, WD, Chen, RF, Guo, B, Hashimoto, T, Togano, Y, Hayakawa, S, Teranishi, T, Iwasa, N, Yamada, T & Komatsubara, T 2013, 'The 18Ne(α,p)21Na breakout reaction in x-ray bursts: Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p', Physical Review C - Nuclear Physics, 巻. 88, 番号 1, 012801. https://doi.org/10.1103/PhysRevC.88.012801
He, J. J. ; Zhang, L. Y. ; Parikh, A. ; Xu, S. W. ; Yamaguchi, H. ; Kahl, D. ; Kubono, S. ; Hu, J. ; Ma, P. ; Chen, S. Z. ; Wakabayashi, Y. ; Sun, B. H. ; Wang, H. W. ; Tian, W. D. ; Chen, R. F. ; Guo, B. ; Hashimoto, T. ; Togano, Y. ; Hayakawa, S. ; Teranishi, T. ; Iwasa, N. ; Yamada, T. ; Komatsubara, T. / The 18Ne(α,p)21Na breakout reaction in x-ray bursts : Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p. :: Physical Review C - Nuclear Physics. 2013 ; 巻 88, 番号 1.
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title = "The 18Ne(α,p)21Na breakout reaction in x-ray bursts: Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p",
abstract = "The 18Ne(α,p)21Na reaction provides a pathway for breakout from the hot CNO cycles to the rp process in type-I x-ray bursts. To better determine this astrophysical reaction rate, the resonance parameters of the compound nucleus 22Mg have been investigated by measuring the resonant elastic scattering of 21Na+p. An 89 MeV 21Na radioactive ion beam was produced at the CNS Radioactive Ion Beam Separator and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled protons were measured at scattering angles of θc.m.≈175< and 152 by three ΔE-E silicon telescopes. The excitation function was obtained with a thick-target method over energies Ex(22Mg) = 5.5-9.2 MeV. The resonance parameters have been determined through an R-matrix analysis. For the first time, the Jπ values for ten states above the α threshold in 22Mg have been experimentally determined in a single consistent measurement. We have made three new Jπ assignments and confirmed seven of the ten tentative assignments in the previous work. The 18Ne(α,p)21Na reaction rate has been recalculated, and the astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the 18Ne(α,p)21Na rate significantly affects the peak nuclear energy generation rate and the onset temperature of this breakout reaction in these phenomena.",
author = "He, {J. J.} and Zhang, {L. Y.} and A. Parikh and Xu, {S. W.} and H. Yamaguchi and D. Kahl and S. Kubono and J. Hu and P. Ma and Chen, {S. Z.} and Y. Wakabayashi and Sun, {B. H.} and Wang, {H. W.} and Tian, {W. D.} and Chen, {R. F.} and B. Guo and T. Hashimoto and Y. Togano and S. Hayakawa and T. Teranishi and N. Iwasa and T. Yamada and T. Komatsubara",
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T1 - The 18Ne(α,p)21Na breakout reaction in x-ray bursts

T2 - Experimental determination of spin-parities for α resonances in 22Mg via resonant elastic scattering of 21Na+p

AU - He, J. J.

AU - Zhang, L. Y.

AU - Parikh, A.

AU - Xu, S. W.

AU - Yamaguchi, H.

AU - Kahl, D.

AU - Kubono, S.

AU - Hu, J.

AU - Ma, P.

AU - Chen, S. Z.

AU - Wakabayashi, Y.

AU - Sun, B. H.

AU - Wang, H. W.

AU - Tian, W. D.

AU - Chen, R. F.

AU - Guo, B.

AU - Hashimoto, T.

AU - Togano, Y.

AU - Hayakawa, S.

AU - Teranishi, T.

AU - Iwasa, N.

AU - Yamada, T.

AU - Komatsubara, T.

PY - 2013/7/29

Y1 - 2013/7/29

N2 - The 18Ne(α,p)21Na reaction provides a pathway for breakout from the hot CNO cycles to the rp process in type-I x-ray bursts. To better determine this astrophysical reaction rate, the resonance parameters of the compound nucleus 22Mg have been investigated by measuring the resonant elastic scattering of 21Na+p. An 89 MeV 21Na radioactive ion beam was produced at the CNS Radioactive Ion Beam Separator and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled protons were measured at scattering angles of θc.m.≈175< and 152 by three ΔE-E silicon telescopes. The excitation function was obtained with a thick-target method over energies Ex(22Mg) = 5.5-9.2 MeV. The resonance parameters have been determined through an R-matrix analysis. For the first time, the Jπ values for ten states above the α threshold in 22Mg have been experimentally determined in a single consistent measurement. We have made three new Jπ assignments and confirmed seven of the ten tentative assignments in the previous work. The 18Ne(α,p)21Na reaction rate has been recalculated, and the astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the 18Ne(α,p)21Na rate significantly affects the peak nuclear energy generation rate and the onset temperature of this breakout reaction in these phenomena.

AB - The 18Ne(α,p)21Na reaction provides a pathway for breakout from the hot CNO cycles to the rp process in type-I x-ray bursts. To better determine this astrophysical reaction rate, the resonance parameters of the compound nucleus 22Mg have been investigated by measuring the resonant elastic scattering of 21Na+p. An 89 MeV 21Na radioactive ion beam was produced at the CNS Radioactive Ion Beam Separator and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled protons were measured at scattering angles of θc.m.≈175< and 152 by three ΔE-E silicon telescopes. The excitation function was obtained with a thick-target method over energies Ex(22Mg) = 5.5-9.2 MeV. The resonance parameters have been determined through an R-matrix analysis. For the first time, the Jπ values for ten states above the α threshold in 22Mg have been experimentally determined in a single consistent measurement. We have made three new Jπ assignments and confirmed seven of the ten tentative assignments in the previous work. The 18Ne(α,p)21Na reaction rate has been recalculated, and the astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the 18Ne(α,p)21Na rate significantly affects the peak nuclear energy generation rate and the onset temperature of this breakout reaction in these phenomena.

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