Dynamical Dipole mode in heavy-ion fusion reactions
INFN - Napoli, Napoli, Italy
2 INFN - LNS, Catania, Italy
3 University of Bucharest, Bucharest and NIPNE-HH, Magurele, Romania
4 INFN - Catania, Catania, Italy
5 Dip. di Fisica e Astronomia, Università di Catania, Catania, Italy
6 INFN - Gr. Col. di Messina and Università di Messina, Messina, Italy
7 GSI, Darmstadt, Germany
8 Dip. di Fisica, Università di Milano and INFN - Milano, Milano, Italy
9 Dip. di Fisica, Università di Napoli, Napoli, Italy
10 Dip. di Fisica e Astronomia, Università di Padova and INFN - Padova, Padova, Italy
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Published online: 22 November 2017
The excitation of the Dynamical Dipole mode along the fusion path was investigated for the first time in the formation of a heavy compound nucleus in the A~190 mass region. The compound nucleus was formed at identical conditions of excitation energy and spin from two entrance channels having different charge asymmetry: the charge asymmetric 40Ca + 152Sm and the nearly charge symmetric 48Ca + 144Sm at Elab=11 and 10.1 MeV/nucleon, respectively. Both fusion–evaporation and fission events were studied simultaneously for the first time. The Dynamical Dipole mode excitation in the charge asymmetric channel was evidenced, in a model-independent way, by comparing the γ-ray multiplicity spectra and angular distributions of the two entrance channels with each other.
© The Authors, published by EDP Sciences, 2017
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