Production of new neutron-rich isotopes of heavy elements in fragmentation reactions of $^{238}$U projectiles at 1 A GeV

H. Alvarez-Pol (1) , J. Benlliure (1) , L. Audouin (2) , E. Casarejos (1) , D. Cortina-Gil (1) , T. Enqvist (3) , B. Fernandez (4) , A. R. Junghans , B. Jurado (5) , P. Napolitani (2) , J. Pereira (1) , F. Rejmund (4) , K.-H. Schmidt (3) , O. Yordanov (3)

1 USC - Universidade de Santiago de Compostela [Spain]
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 GSI - Helmholtz zentrum für Schwerionenforschung GmbH
4 GANIL - Grand Accélérateur National d'Ions Lourds
5 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

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.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

H. Alvarez-Pol, J. Benlliure, L. Audouin, E. Casarejos, D. Cortina-Gil, et al.. Production of new neutron-rich isotopes of heavy elements in fragmentation reactions of $^{238}$U projectiles at 1 A GeV. Physical Review C, 2010, 82, pp.041602(R). ⟨10.1103/PhysRevC.82.041602⟩. ⟨in2p3-00508290⟩