Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-10-18
Nucl.Phys. A713 (2003) 3-23
Physics
Nuclear Physics
Nuclear Experiment
20 pages, 13 figures
Scientific paper
10.1016/S0375-9474(02)01296-4
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.
Armbruster Ph.
Benlliure J.
Boeckstiegel C.
Clerc H.-G.
de Jong M.
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