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Indirect measurement of O-17(p,alpha)N-14 cross section at ultra-low energies
Sergi, M. L. ; Spitaleri, C. ; Coc, A. ; Mukhamedzhanov, A. ; Burjan, Václav ; Cherubini, S. ; Crucilla, V. ; Gulino, M. ; Hammache, F. ; Hons, Zdeněk ; Irgaziev, B. ; Kiss, G. G. ; Kroha, Václav ; La Cognata, M. ; Lamia, L. ; Pizzone, R. G. ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; de Sereville, N. ; Somorjai, E. ; Tudisco, S. ; Tumino, A.
The indirect measurement of O-17(p,alpha)N-14 cross section was performed by means of the Trojan Horse Method. This approach allowed to investigate the ultra-low energy range (E-c.m.= 0-300 keV) relevant for several astrophysics environments, where two resonant levels of F-18 at E-c.m.(R) = 65 keV and E-c.m.(R) = 183 keV play a significant role in the reaction rate determination.
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First measurement of the O-18(p, alpha)N-15 cross section at astrophysical energies
La Cognata, M. ; Spitaleri, C. ; Mukhamedzhanov, A. ; Tribble, R. E. ; Al-Abdullah, T. ; Banu, A. ; Cherubini, S. ; Coc, A. ; Crucilla, V. ; Goldberg, V. ; Gulino, M. ; Irgaziev, B. ; Kiss, G. G. ; Lamia, L. ; Mrázek, Jaromír ; Pizzone, R. G. ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; Sergi, M. L. ; Tabacaru, G. ; Trache, L. ; Trzaska, W. ; Tudisco, S. ; Tumino, A.
The O-18(p, alpha)N-15 reaction rate has been deduced by means of the Trojan horse method. For the first time the contribution of the 20 keV resonance has been directly evaluated, giving a value about 35% larger than the one in the literature. Moreover, the present approach has allowed to improve the accuracy by a factor 8.5, as it is based on the measured strength instead of spectroscopic measurements. The contribution of the 90 keV resonance has been also determined, which turned out to be of negligible importance to astrophysics.
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Astrophysical Reaction Rates Obtained By Indirect Techniques
Tribble, R. E. ; Al-Abdullah, T. ; Alharbi, A. ; Aysto, J. ; Banu, A. ; Burjan, Václav ; Carstoiu, F. ; Chen, X. ; Clark, H. L. ; Davidson, T. ; Fu, C. ; Gagliardi, C. A. ; Hardy, J. C. ; Iacob, V. E. ; Jokinen, J. ; Kroha, Václav ; Lui, Y. W. ; McCleskey, M. ; Mukhamedzhanov, A. ; Nica, N. ; Park, H. ; Roeder, B. T. ; Saastamoinen, A. ; Simmons, E. ; Tabacaru, G. ; Tokimoto, Y. ; Trache, L. ; Woods, P. J. ; Zhai, Y.
ndirect techniques have been used to obtain information about reaction rates for several proton capture reactions that occur on short-lived nuclei. The techniques used to carry out the measurements are reviewed and the results obtained are presented. Also future prospects for further measurements with a new facility, T-REX, are discussed.
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Spectator invariance test in the study of the Li-6,Li-7 fusion reactions via the Trojan Horse Method
Pizzone, R. G. ; Lamia, L. ; Bertulani, C. A. ; Mukhamedzhanov, A. ; Spitaleri, C. ; Blokhinstev, L. ; Burjan, Václav ; Cherubini, S. ; Hons, Zdeněk ; Kiss, G. G. ; Kroha, Václav ; La Cognata, M. ; Li, C. ; Mrázek, Jaromír ; Piskoř, Štěpán ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; Sergi, M. L. ; Tumino, A.
Fusion reactions play a crucial role for several astrophysical scenarios. At the low energies typical of such environments direct measurements of reaction cross sections are very difficult, and even sometimes impossible. In such cases the use of indirect methods can give a substantial help. The Trojan Horse Method (THM) is based on the quasi-free break-up of a nucleus, which can be described in terms of a cluster structure. In such applications the independence of THM results with different break-up schemes, was tested using the quasi free(3)He(Li-6,alpha alpha)H and He-3(Li-7,alpha alpha)H-2 reactions. Results were then compared with the direct behaviours obtained from available data as well as with the cross sections extracted from previous indirect investigations of the same binary reactions using a different nuclide as a Trojan Horse nucleus.
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High accuracy O-18(p, alpha)N-15 reaction rate in the 8 . 10(6)-5 . 10(9) K temperature range
La Cognata, M. ; Spitaleri, C. ; Mukhamedzhanov, A. ; Banu, A. ; Cherubini, S. ; Coc, A. ; Crucilla, V. ; Goldberg, V. ; Gulino, M. ; Irgaziev, B. ; Kiss, G. G. ; Lamia, L. ; Mrázek, Jaromír ; Pizzone, R. G. ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; Sergi, M. L. ; Tabacaru, G. ; Trache, L. ; Tribble, R. E. ; Trzaska, W. ; Tumino, A.
The O-18(p, alpha)N-15 reaction is of great importance in several astrophysical scenarios, as it influences the production of key isotopes such as F-19, O-18 and N-15. In this work, a high accuracy O-18(p, alpha) N-15 reaction rate is proposed, based on the simultaneous fit of direct measurements and of the results of a new Trojan Horse experiment. In particular, we have focused on the study of the broad 660 keV 1/2(+) resonance. Since Gamma similar to 100 - 300 keV, it strongly influences the nearly-zero-energy region of the cross section by means of the low-energy tail of the resonant contribution and dominates the cross section at higher energies. Here we provide a factor of 2 larger reaction rate above T similar to 0.510(9) K based over our new improved determination of its resonance parameters.
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Trojan horse method with neutrons induced reactions: The 17O(n,alpha)14C reaction
Guardo, G. L. ; Spitaleri, C. ; Lamia, L. ; Gulino, M. ; Tang, X. ; Bucher, B. ; Burjan, Václav ; Couder, M. ; Davies, P. ; deBoer, R. ; Fang, X. ; Kroha, Václav ; La Cognata, M. ; Ma, C. ; Mrázek, Jaromír ; Mukhamedzhanov, A. ; Notani, M. ; O'Brien, S. ; Pizzone, R. G. ; Rapisarda, G. G. ; Roberson, D. ; Sergi, M. L. ; Tan, W. ; Wiescher, M.
The experimental study of the 17O(n,alpha)14C reaction has been performed in the energy range 0-350 keV. This reaction could play an important role in explaining heavy elements (s-process) nucleosynthesis in various astrophysical scenario. To over-come the practical problems arising from the neutrons production, a new application of the Trojan Horse Method has been recently suggested.
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Determination of .SUP.16 O(p,.gamma.).sup.17 F S factors from proton transfer reactions
Cagliardi, C. A. ; Tribble, R. E. ; Azhari, A. ; Clark, H. L. ; Mukhamedzhanov, A. M. ; Sattarov, A. ; Trache, L. ; Burjan, Václav ; Cejpek, Jan ; Kroha, Václav ; Piskoř, Štěpán ; Vincour, Jiří
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The .sup.10 B(.sup.7 Be,.sup.8 Be).sup.9 Be reaction and .sup.7 Be(p.gamma.).sup.8 B S factor
Azhari, A. ; Burjan, Václav ; Carstoiu, F. ; Dejbakhsh, H. ; Cagliardi, C. A. ; Kroha, Václav ; Mukhamedzhanov, A. M. ; Trache, L. ; Tribble, R. E.
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