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]

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Summary

Introduction

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.

Isotopic effects and even-odd staggering
Light charged particles in coincidence with HR
Isospin diffusion effects
Conclusions

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