The observation of 26Al in the Milky Way is a clear hint of recent nucleosynthesis (τ ∼1 My). The 26Al distribution is a robust parameter to control the predictions of stellar evolution models. A recent sensitivity study demonstrated that the 25Mg(a,n)28Si is the reaction with the strongest impact on 26Al during explosive neon and carbon burning. Its cross section was measured by several experiments reporting discrepancy of more than a factor of 3. In order to improve the experimental knowledge of the 25Mg(α,n)28Si cross section, a new direct measurement has been performed at Laboratori Nazionali di Legnaro. Neutron spectroscopy is provided by the time of flight technique and pulsed beam. γ- n discrimination is achieved applying the Pulse Shape Analysis technique. Preliminary results of differential cross section in a range of angle from 17 up to 106 degrees will be presented.
The 25Mg(a,n)28Si reaction studied at LNL / A. Caciolli, R. Depalo, T. Marchi, S. Appannababu, N. Blasi, C. Broggini, F. Camera, M. Cinausero, G. Collazuol, D. Fabris, F. Gramegna, V.L. Kravchuk, A. Lombardi, P. Mastinu, R. Menegazzo, V. Rigato, C. Rossi Alvarez, O. Wieland. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 11-15:(2014), pp. 066.1-066.4. (Intervento presentato al 15. convegno International Workshop on Neutrino Telescopes tenutosi a Venezia nel 2013) [10.22323/1.196.0066].
The 25Mg(a,n)28Si reaction studied at LNL
R. Depalo;F. Camera;
2014
Abstract
The observation of 26Al in the Milky Way is a clear hint of recent nucleosynthesis (τ ∼1 My). The 26Al distribution is a robust parameter to control the predictions of stellar evolution models. A recent sensitivity study demonstrated that the 25Mg(a,n)28Si is the reaction with the strongest impact on 26Al during explosive neon and carbon burning. Its cross section was measured by several experiments reporting discrepancy of more than a factor of 3. In order to improve the experimental knowledge of the 25Mg(α,n)28Si cross section, a new direct measurement has been performed at Laboratori Nazionali di Legnaro. Neutron spectroscopy is provided by the time of flight technique and pulsed beam. γ- n discrimination is achieved applying the Pulse Shape Analysis technique. Preliminary results of differential cross section in a range of angle from 17 up to 106 degrees will be presented.
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