New isotopes and isomers produced by the fragmentation of 238U at 1000 MeV/nucleon

M. Pfützner, P. Armbruster, T. Baumann, J. Benlliure, M. Bernas, W. N. Catford, D. Cortina-Gil, J. M. Daugas, H. Geissel, M. Górska, H. Grawe, R. Grzywacz, M. Hellström, N. Iwasa, Z. Janas, A. R. Junghans, M. Karny, S. Leenhardt, M. Lewitowicz, A. C. MuellerF. De Oliviera, P. M. Regan, M. Rejmund, K. Rykaczewski, K. Sümmerer

Research output: Contribution to journalArticlepeer-review

108 Citations (Scopus)


Seven previously unobserved neutron-rich isotopes (209Hg, 210Hg, 211Tl, 212Tl, 218Bi, 219Po and 220Po) have been identified among the fragmentation products of a 1000 MeV/nucleon 238U beam incident on a beryllium target. The γ-ray decays of 9 known and 4 new μs-isomers in nuclei around 208Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 1998 Dec 17


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