Long Fission Times of Super-Heavy Compound Nuclei
- DSM/IRFU/SPhN, CEA Saclay, F-91191 Gif/Yvette Cedex (France)
- GANIL, DSM/CEA, IN2P3/CNRS, BP 55027, F-14076 Caen Cedex 5 (France)
- IPNL, Universite de Lyon, Universite Lyon 1 IN2P3/CNRS, 4 rue E. Fermi, F-69622 Villeurbanne Cedex (France)
- INSP, Univ. Paris 6 et Paris 7, 140 rue de Lourmel, F-75015 Paris (France)
- IPNO, Universite Paris-Sud 11, CNRS/IN2P3, Orsay (France)
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 deg. relative to the beam direction. The Z and the energies of all products are measured with {delta}E-E telescopes of the 4{pi} INDRA array, so that all reaction channels are unambiguously identified. With this setup, we can reach long fission times (>10{sup -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.
- OSTI ID:
- 21143154
- Journal Information:
- AIP Conference Proceedings, Vol. 1005, Issue 1; Conference: CNR 2007: 2007 international workshop on compound-nuclear reactions and related topics, Yosemite National Park, CA (United States), 22-26 Oct 2007; Other Information: DOI: 10.1063/1.2920734; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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