Abstract
The new neutronrich isotope 228 Rn was produced by spallation reactions induced by 600 MeV protons in a 232 Th target and identified by massseparation and decay spectroscopy. The Zassignment was confirmed via KX-rays and the genetic relationship to the wellknown daughter product 228 Fr. The halflife of 228 Rn 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 isotope 228 Rn and 227 Rn.
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This work was supported in part by the German Federal Minister for Research and Technology (BMFT) under contract number 06 Mz 552, the Polish Ministry of National Education under contract CPBP 01.06, and the Norwegian Research Council.