Abstract
Effects related to the neutron to proton ratio (N/Z) degree of freedom in 40,48 Ca+ 40,48 Ca reactions at 25 MeV/nucleon have been investigated. Isotopic effect and even-odd staggering characterize the emission of light fragments at forward angles. The study of isobaric ratio 7 Li/ 7 Be for quasi-projectile source in semi-peripheral event of reactions allows moreover to investigate isospin diffusion effects in heavy ion collisions.
Highlights
In the last two decades, special attention was devoted to study various effects that can be attributed to the neutron to proton ratio (N/Z) degree of freedom in heavy ion collisions, especially in the intermediate energy regime [1]
They go from isotopic effects in the light fragment isotopic yields [2], to isospin transport effects that can be seen in mid-peripheral heavy ion collisions [3]
The amplitude of even-odd staggering effect that typically characterize Z and N distributions of light fragments emitted in heavy ion collisions seems to be linked with the neutron content of the entrance channel [4, 5]
Summary
In the last two decades, special attention was devoted to study various effects that can be attributed to the neutron to proton ratio (N/Z) degree of freedom in heavy ion collisions, especially in the intermediate energy regime [1]. Neutron richness of total system seems to strongly regulate the interplay between various reaction mechanisms that characterize semi-central collisions [7, 8]. To investigate these phenomena, we analyzed experimental results concerning 40,48Ca+40,48Ca reactions at 25 MeV/nucleon. We analyzed experimental results concerning 40,48Ca+40,48Ca reactions at 25 MeV/nucleon These four reactions are well suited to perform these type of investigations, because of the large variety of N/Z involved in the entrance channels.
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