The production of heavy neutron-rich nuclei has been investigated using cold fragmentation reactions of $^{ 238}$U projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer FRS at GSI allowed to identify 45 new heavy neutron-rich nuclei: $^{ 205}$Pt, $^{ 207-210}$Au, $^{ 211-216}$Hg, $^{ 213-217}$Tl, $^{ 215-220}$Pb, $^{ 219-224}$Bi, $^{ 221-227}$Po, $^{ 224-229}$At, $^{ 229-231}$Rn and $^{ 233}$Fr. The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability.
Categories: nucl-ex