First experiment on fission transients in highly fissile spherical nuclei produced by fragmentation of radioactive beams.
We report on a novel experimental approach for studying the dissipative spreading of collective motion in a metastable nuclear system, using, for the first time, highly fissile nuclei with spherical shape. This was achieved by fragmentation of 45 radioactive heavy-ion beams at GSI, Darmstadt. The use of inverse kinematics and a dedicated experimental setup allowed for the identification in atomic number of both fission fragments. From the width of their nuclear-charge distributions, a transient time of (3.3+/-0.7)x10(-21) s is deduced for initially spherical nuclei.
Gesellschaft fuer Schwerionenforschung, 64291 Darmstadt, Germany.
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Schmitt
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Nadtochy
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Heinz
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Jurado
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Kelić
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Schmidt