We measured γ-ray spectra in coincidence with charged particles for the reactions 40Ca+48Ca, 46Ti at beam energy of 25 MeV/nucleon. Events corresponding to reaction mechanisms from quasielastic to fusion were observed. In fusion and in inelastic reactions an enhancement in the γ-ray spectra is present in the energy region around 10 MeV for the 48Ca target with respect to 46Ti data. The analysis of the γ-ray spectra relative to 48Ca and 46Ti targets shows the persistence of the GDR up to an excitation energy around 4-5 MeV/nucleon for the mass region around 60. This result was obtained by including, in the statistical calculations, corrections due to the open decay channels, the mass dependence of the GDR parameters, and isospin effects.
Statistical and preequilibrium gamma ray emission in heavy ion reactions at 25 A.MeV
LANZALONE, GAETANO
Membro del Collaboration Group
;
2004-01-01
Abstract
We measured γ-ray spectra in coincidence with charged particles for the reactions 40Ca+48Ca, 46Ti at beam energy of 25 MeV/nucleon. Events corresponding to reaction mechanisms from quasielastic to fusion were observed. In fusion and in inelastic reactions an enhancement in the γ-ray spectra is present in the energy region around 10 MeV for the 48Ca target with respect to 46Ti data. The analysis of the γ-ray spectra relative to 48Ca and 46Ti targets shows the persistence of the GDR up to an excitation energy around 4-5 MeV/nucleon for the mass region around 60. This result was obtained by including, in the statistical calculations, corrections due to the open decay channels, the mass dependence of the GDR parameters, and isospin effects.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
