In heavy-ion nuclear reactions the process leading to complete fusion is expected to produce pre-equilibrium γ-ray emission, called dynamical dipole (DD), when particular conditions are met. Indeed, when there is an N/Z asymmetry between projectile and target, charge equilibration takes place with a collective dipole oscillation associated to a γ-ray emission. The existing experimental data concerning this pre-equilibrium γ-ray emission are still rather scarce and manly concentrated in the A ≃ 132 mass region. It is important to point out that the model, used to compared the data, critically depends on the nuclear equation of state with its symmetry term. The very preliminary results concerning the measurement of the DD γ-ray emission in the fusion reaction 16O (Elab = 192MeV) + 116Sn at 12MeV/u will be presented. The experiment aims at the measurement of the total emission yield of the DD at 12MeV/u where the predicted theoretical yield does not completely reproduce the experimental data. The experiment has been performed at the INFN Legnaro Laboratories using the GARFIELD-HECTOR array.
New studies of the dynamical dipole in asymmetric heavy-ion reactions: A probe of the nuclear equation of state / A. Giaz, A. Corsi, F. Camera, A. Bracco, F.C.L. Crespi, S. Leoni, R. Nicolini, V. Vandone, G. Benzoni, N. Blasi, S. Brambilla, B. Million, O. Wieland, T. Marchi, V.L. Kravchuk, M. Cinausero, M. Degelier, F. Gramegna, V. Rizzi, P. Bednarcyk, M. Ciemala, M. Kmiecik, A. Maj, K. Mazurek, W. Meczynski, G. Baiocco, M. Bruno, M. D'Agostino, L. Morelli, G. Vannini, S. Barlini, L. Bardelli, M. Bini, S. Carboni, G. Casini, M. Chiari, A. Nannini, G. Pasquali, S. Piantelli, G. Poggi, A. Ordine, R. Alba, C. Maiolino, D. Santonocito, M. Colonna, M. Di Toro, C. Rizzo, D. Montanari (PROCEEDINGS OF THE INTERNATIONAL SCHOOL OF PHYSICS "ENRICO FERMI"). - In: From the Big Bang to the Nucleosynthesis / [a cura di] A. Bracco, E. Nappi. - [s.l] : IOS, 2011. - ISBN 9781607509738. - pp. 407-412 (( Intervento presentato al 178. convegno Course of the International School of Physics Enrico Fermi on From the Big Bang to the Nucleosynthesis tenutosi a Varenna, ita nel 2010.
New studies of the dynamical dipole in asymmetric heavy-ion reactions: A probe of the nuclear equation of state
A. GiazPrimo
;A. CorsiSecondo
;F. Camera;A. Bracco;F.C.L. Crespi;S. Leoni;R. Nicolini;V. Vandone;
2011
Abstract
In heavy-ion nuclear reactions the process leading to complete fusion is expected to produce pre-equilibrium γ-ray emission, called dynamical dipole (DD), when particular conditions are met. Indeed, when there is an N/Z asymmetry between projectile and target, charge equilibration takes place with a collective dipole oscillation associated to a γ-ray emission. The existing experimental data concerning this pre-equilibrium γ-ray emission are still rather scarce and manly concentrated in the A ≃ 132 mass region. It is important to point out that the model, used to compared the data, critically depends on the nuclear equation of state with its symmetry term. The very preliminary results concerning the measurement of the DD γ-ray emission in the fusion reaction 16O (Elab = 192MeV) + 116Sn at 12MeV/u will be presented. The experiment aims at the measurement of the total emission yield of the DD at 12MeV/u where the predicted theoretical yield does not completely reproduce the experimental data. The experiment has been performed at the INFN Legnaro Laboratories using the GARFIELD-HECTOR array.
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