The new neutron-rich isotope228Rn

The new neutronrich isotope228Rn was produced by spallation reactions induced by 600 MeV protons in a232Th target and identified by massseparation and decay spectroscopy. The Zassignment was confirmed via KX-rays and the genetic relationship to the wellknown daughter product228Fr. The halflife of228Rn is 65±2 s. Energies and relative intensities of prominent γ-rays are presented for the first time from the decay of both the new isotope228Rn and227Rn.