New experimental results supporting the hypothesis of the excitation of collective modes in the 40Ca + 40Ca reaction

H. Tricoire (1) , P. Colombani , C. Gerschel , D. Paya , N. Perrin (1) , L. Valentin (1) , N. Frascaria (1) , J.P. Garron (1) , C. Stéphan (1)

1 IPNO - Institut de Physique Nucléaire d'Orsay

Steps in the γ-ray multiplicity as function of the excitation energy have been observed in coincidence with the incompletely relaxed part of the energy spectra of fragments emitted in the reaction 40Ca + 40Ca at 400 MeV. Excitation energies and angular dependence of these variations suggest that they are correlated with the excitation of high energy collective modes through a rather direct process in the early stages of the reaction. l-values of this excitation mode are discussed.

Mots clés: gamma ray spectra; heavy ion nucleus reactions; nuclear collective states and giant resonances; nuclei with mass number 39 to 58; collective modes; sup 40 Ca+ sup 40 Ca reaction; gamma ray multiplicity

Domaines: Articles anciens; Physique Nucléaire Expérimentale [nucl-ex]

H. Tricoire, P. Colombani, C. Gerschel, D. Paya, N. Perrin, et al.. New experimental results supporting the hypothesis of the excitation of collective modes in the 40Ca + 40Ca reaction. Journal de Physique Lettres, 1979, 40 (8), pp.181-184. ⟨10.1051/jphyslet:01979004008018100⟩. ⟨jpa-00231602⟩