|
|
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.
|
|
|
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.
|
|
|
Indirect Approach To The H-2(d,p)H-3 Reaction Study
Sparta, R. ; Pizzone, R. G. ; Spitaleri, C. ; Aliotta, M. ; Burjan, Václav ; Cherubini, S. ; Crucilla, V. ; Gulino, M. ; Hons, Zdeněk ; Kiss, G. G. ; Kroha, Václav ; La Cognata, M. ; Lamia, L. ; McCleskey, M. ; Mrázek, Jaromír ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; Sergi, M. L. ; Trache, L. ; Tumino, A.
In order to understand primordial and stellar nucleosynthesis, we have studied H-2(d,p)H-3 reaction at 0.4 MeV down to astrophysical energies. Knowledge of its S-factor is interesting also to plan reactions for fusion reactors to produce energy. The H-2(d,p)H-3 reaction has been studied through the Trojan Horse Method applied to the three-body reaction H-2(He-3,pt)H, at beam energy of 17 MeV. Once selection of protons and tritons detected in coincidence and the selection of quasi-free events, the obtained S-factor is compared with direct measurements. Such data are in agreement with the direct ones and a pole invariance test has been obtained comparing the present results with another H-2(d,p)H-3 THM measurements, where a different spectator particle was employed.
|
|
|
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.
|
|
|
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.
|
host ::
RSS.