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Electromagnetic-induced fission of 238U projectile fragments, a test case for the production of spherical super-heavy nuclei

A. Heinz·K. -H. Schmidt·A. R. Junghans·P. Armbruster·J. Benlliure·C. Boeckstiegel·H. -G. Clerc·A. Grewe·M. de Jong·J. Mueller·M. Pfuetzner·S. Steinhaeuser·B. Voss
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Abstract

Isotopic series of 58 neutron-deficient secondary projectiles (205,206At, 205-209Rn, 208-212,217,218Fr, 211-223Ra, 215-226Ac, 221-229Th, 226-231Pa, 231-234U) were produced by projectile fragmentation using a 1 A GeV 238U beam. Cross sections of fission induced by nuclear and electromagnetic interactions in a secondary lead target were measured. They were found to vary smoothly as a function of proton and neutron number of the fissioning system, also for nuclei with large ground-state shell effects near the 126-neutron shell. No stabilization against fission was observed for these nuclei at low excitation energies. Consequences for the expectations on the production cross sections of super-heavy nuclei are discussed.

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A. Heinz, K. -H. Schmidt, A. R. Junghans, P. Armbruster, J. Benlliure, C. Boeckstiegel, H. -G. Clerc, A. Grewe, M. de Jong, J. Mueller, M. Pfuetzner, S. Steinhaeuser, B. Voss. 2002-10-18. Electromagnetic-induced fission of 238U projectile fragments, a test case for the production of spherical super-heavy nuclei. https://doi.org/10.1016/s0375-9474(02)01296-4

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