In heavy ion nuclear reactions the process leading to complete fusion is expected to produce pre-equilibrium γ-ray emission, if 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, called Dynamical Dipole (DD), 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. The very preliminary results concerning the measurement of the DD γ-ray emission in the fusion reaction 16O (E lab=192 MeV) + 116Sn at 12 MeV/u will be presented and compared with the γ yield measured for the same reaction at 8.1 and 15.6 MeV/u. The present experiment aims at the measurement of the total emission yield of the DD at 12 MeV/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.
Measurements of dynamical dipole in isospin asymmetric fusion reactions / 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, M. Cinausero, M. Degelier, F. Gramegna, V.L. Kravchuk, T. Marchi, V. Rizzi, L. Bardelli, S. Barlini, M. Bini, S. Carboni, G. Casini, M. Chiari, A. Nannini, G. Pasquali, S. Piantelli, G. Poggi, G. Baiocco, M. Bruno, M. D'agostino, L. Morelli, V. Vannini, M. Colonna, M. Di Toro, C. Rizzo, P. Bednarcyk, M. Ciemala, M. Kmiecik, A. Maj, K. Mazurek, W. Menczynski, R. Alba, C. Maiolino, D. Santonocito, D. Montanari, A. Ordine - In: Journal of Physics: Conference Series Volume 366, Issue 1, 2012, Article number 012018 19th International School on Nuclear Physics, Neutron Physics and Applications, VARNA 2011; Varna; Bulgaria; 19 September 2011 through 25 September 2011; Code 90308[s.l] : IOP, 2012. - pp. 012018 (( convegno 19th International School on Nuclear Physics, Neutron Physics and Applications, VARNA 2011 tenutosi a Varna, bgr nel 2011.
Measurements of dynamical dipole in isospin asymmetric fusion reactions
A. Giaz;F. Camera;A. Bracco;F.C.L. Crespi;S. Leoni;R. Nicolini;V. Vandone;D. Montanari;
2012
Abstract
In heavy ion nuclear reactions the process leading to complete fusion is expected to produce pre-equilibrium γ-ray emission, if 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, called Dynamical Dipole (DD), 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. The very preliminary results concerning the measurement of the DD γ-ray emission in the fusion reaction 16O (E lab=192 MeV) + 116Sn at 12 MeV/u will be presented and compared with the γ yield measured for the same reaction at 8.1 and 15.6 MeV/u. The present experiment aims at the measurement of the total emission yield of the DD at 12 MeV/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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