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

Abstract

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.

arXiv comment5 pages, 2 figures

References in corpus (6)

• Modified Empirical Parametrization of Fragmentation Cross Sections
• Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a 238U Beam at 345 MeV/nucleon
• Measurement of a complete set of nuclides, cross-sections and kinetic energies in spallation of 238U 1A GeV with protons
• Measurement of nuclide cross-sections of spallation residues in 1 A GeV 238U + proton collisions
• Production of medium-mass neutron-rich nuclei in reactions induced by 136Xe projectiles at 1 A GeV on a beryllium target
• Evaporation residues produced in spallation of 208Pb by protons at 500A MeV

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• $\beta$-decay half-lives and $\beta$-delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb and Bi, beyond N=126
• Discovery of the thallium, lead, bismuth, and polonium isotopes
• Neutron-rich rare isotope production with stable and radioactive beams in the mass range A=40-60 at beam energy around 15 MeV/nucleon
• 2014 Update of the Discoveries of Nuclides
• Neutron-rich rare isotope production from projectile fission of heavy beams in the energy range of 20 MeV/nucleon
• Reexamining the half-lives of 195Os and 195Ir
• Dispersion of longitudinal momentum distributions induced in fragmentation reactions
• A comprehensive study of decay modes associated with Pb isotopes