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New astrophysical S factor for the N-15(p,gamma)O-16 reaction via the asymptotic normalization coefficient (ANC) method

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    0311394 - ÚJF 2009 RIV US eng J - Journal Article
    Mukhamedzhanov, A. M. - Bém, Pavel - Burjan, Václav - Gagliardi, C. A. - Goldberg, V.Z. - Hons, Zdeněk - La Cognata, M. - Kroha, Václav - Mrázek, Jaromír - Novák, Jan - Piskoř, Štěpán - Pizzone, R. G. - Plunkett, A. - Romano, S. - Šimečková, Eva - Spitareli, C. - Trache, L. - Tribble, R. E. - Veselý, František - Vincour, Jiří
    New astrophysical S factor for the N-15(p,gamma)O-16 reaction via the asymptotic normalization coefficient (ANC) method.
    [Nový astrofyzikální S faktor pro reakci 15N(p,gama)16-O metodou asymptotických normalizačních koeficientů.]
    Physical Review. C. Roč. 78, č. 1 (2008), 015804/1-015804/8. ISSN 0556-2813
    R&D Projects: GA ČR GA202/05/0302; GA MŠMT LC07050
    Institutional research plan: CEZ:AV0Z10480505
    Keywords : ANC
    Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
    Impact factor: 3.124, year: 2008

    The N-15(p,gamma)O-16 reaction provides a path from the CN cycle to the CNO bi-cycle and CNO tri-cycle. The measured astrophysical factor for this reaction is dominated by resonant capture through two strong J(pi) = 1(-) resonances at E-R = 312 and 962 keV and direct capture to the ground state. Asymptotic normalization coefficients (ANCs) for the ground and seven excited states in O-16 were extracted from the comparison of experimental differential cross sections for the N-15(He-3,d)O-16 reaction with distorted-wave Born approximation calculations. Using these ANCs and proton and alpha resonance widths determined from an R-matrix fit to the data from the N-15(p,alpha)C-12 reaction, we carried out an R-matrix calculation to obtain the astrophysical factor for the N-15(p,gamma)O-16 reaction. The results indicate that the direct capture contribution was previously overestimated.

    Z naměřených úhlových rozložení byly pomocí výpočtů DWBA určeny ANC pro přímý záchyt. Dále byly provedeny výpočty v rámci R-maticové teorie a získán celkový astrofyzikální faktor reakce 15N(p,gama )16O zahrnující rezonanční i nerezonanční proces.
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