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Long fission times of super-heavy compound nuclei

Abstract : The blocking technique in single crystals is a direct method to investigate the presence of long fission time components. With a lead beam impinging on a germanium single crystal, we tried to produce compound nuclei (CN) with atomic number Z = 114 at high excitation energy. Blocking patterns for reaction products are reconstructed with position sensitive detectors at 20 ° relative to the beam direction. The Z and the energies of all products are measured with DeltaE-E telescopes of the 4pi INDRA array, so that all reaction channels are unambiguously identified. With this setup, we can reach long fission times (>10−18 s) that can be associated with CN fissions. However, in contrast to previous experiments in which such long fission times could be measured for Z = 120 and 124, no hint of long lifetimes within our sensitivity limit for Z = 114 was observed, which may be due to the neutron deficiency of the formed isotopes.
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http://hal.in2p3.fr/in2p3-00289020
Contributor : Michel Lion <>
Submitted on : Thursday, June 19, 2008 - 12:42:43 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:15 PM

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A. Drouart, J. L. Charvet, A. Chbihi, M. Chevallier, C. Cohen, et al.. Long fission times of super-heavy compound nuclei. International Workshop on Compound-nuclear reactions and related topics - CNR 2007, 2007, Yosemite National Park, United States. pp.215-218, ⟨10.1063/1.2920734⟩. ⟨in2p3-00289020⟩

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