Reaction rate of the 13C(α,n)16O neutron source using the ANC of the -3 keV resonance measured with the THM

M. La Cognata, C. Spitaleri, O. Trippella, G. Kiss, G. V. Rogachev, A. M. Mukhamedzhanov, M. Avila, G. L. Guardo, E. Koshchiy, A. Kuchera, L. Lamia, S. M R Puglia, S. Romano, D. Santiago, R. Spartà

Research output: Contribution to journalArticle

Abstract

The s-process is responsible of the synthesis of most of the nuclei in the mass range 90 ≤ A ≤ 208. It consists in a series of neutron capture reactions on seed nuclei followed by β-decays, since the neutron accretion rate is slower than the β-decay rate. Such small neutron flux is supplied by the 13C(α,n)16O reaction. It is active inside the helium-burning shell of asymptotic giant branch stars, at temperatures <108 K, corresponding to an energy interval of 140-230 keV. In this region, the astrophysical S (E)-factor is dominated by the -3 keV sub-threshold resonance due to the 6.356 MeV level in 17O. In this work, we have applied the Trojan Horse Method (THM) to the 13C(6Li,n16O)d quasi-free reaction to extract the 6.356 MeV level resonance parameters, in particular the asymptotic normalization coefficient (ANC) (C17O(1/2+ α13C)2. A preliminary analysis of a partial data set has lead to (C17O(1/2+ α13C)2 = 6.7+0.9 -0.6 fm-1, slightly larger than the values in the literature. However, the deduced 13C(α, n)16O reaction rate is in agreement with most results in the literature at ∼ 108 K, with enhanced accuracy thanks to our innovative approach merging together ANC and THM.

Original languageEnglish
Article number012013
JournalJournal of Physics: Conference Series
Volume665
Issue number1
DOIs
Publication statusPublished - Jan 5 2016

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neutron sources
reaction kinetics
coefficients
neutrons
nuclei
asymptotic giant branch stars
flux (rate)
decay rates
seeds
astrophysics
helium
intervals
thresholds
decay
synthesis
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Reaction rate of the 13C(α,n)16O neutron source using the ANC of the -3 keV resonance measured with the THM. / La Cognata, M.; Spitaleri, C.; Trippella, O.; Kiss, G.; Rogachev, G. V.; Mukhamedzhanov, A. M.; Avila, M.; Guardo, G. L.; Koshchiy, E.; Kuchera, A.; Lamia, L.; Puglia, S. M R; Romano, S.; Santiago, D.; Spartà, R.

In: Journal of Physics: Conference Series, Vol. 665, No. 1, 012013, 05.01.2016.

Research output: Contribution to journalArticle

La Cognata, M, Spitaleri, C, Trippella, O, Kiss, G, Rogachev, GV, Mukhamedzhanov, AM, Avila, M, Guardo, GL, Koshchiy, E, Kuchera, A, Lamia, L, Puglia, SMR, Romano, S, Santiago, D & Spartà, R 2016, 'Reaction rate of the 13C(α,n)16O neutron source using the ANC of the -3 keV resonance measured with the THM', Journal of Physics: Conference Series, vol. 665, no. 1, 012013. https://doi.org/10.1088/1742-6596/665/1/012013
La Cognata, M. ; Spitaleri, C. ; Trippella, O. ; Kiss, G. ; Rogachev, G. V. ; Mukhamedzhanov, A. M. ; Avila, M. ; Guardo, G. L. ; Koshchiy, E. ; Kuchera, A. ; Lamia, L. ; Puglia, S. M R ; Romano, S. ; Santiago, D. ; Spartà, R. / Reaction rate of the 13C(α,n)16O neutron source using the ANC of the -3 keV resonance measured with the THM. In: Journal of Physics: Conference Series. 2016 ; Vol. 665, No. 1.
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AU - Kiss, G.

AU - Rogachev, G. V.

AU - Mukhamedzhanov, A. M.

AU - Avila, M.

AU - Guardo, G. L.

AU - Koshchiy, E.

AU - Kuchera, A.

AU - Lamia, L.

AU - Puglia, S. M R

AU - Romano, S.

AU - Santiago, D.

AU - Spartà, R.

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