Speaker
Arnaud Le Fèvre
(GSI Helmholtzzentrum Darmstadt)
Description
A new method, based on comparing isotopic yield ratios measured at forward and sideward polar angles and on cross-bombarding heavy nuclei with different neutron-to-proton ratios, is used to quantify the stopping power of nuclear matter in heavy-ion collisions. For central collisions of isotopically separated 124,129Xe+112,124Sn at 100 MeV/nucleon bombarding energy, measured with the 4π multidetector INDRA at GSI, a moderate transparency is deduced for hydrogen isotopes, whereas for heavier fragmentation products with atomic number $Z\geq 3$ a high transparency exceeding 50% is observed. An anomalously large transparency is found for alpha particles, and possible explanations are presented.
Author
Arnaud Le Fèvre
(GSI Helmholtzzentrum Darmstadt)