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Title: The fusion-fission process in the reaction {sup 34}S+{sup 186}W near the interaction barrier

The reaction {sup 34}S+{sup 186}W at E{sub lab}=160 MeV was investigated with the aim of diving into the features of the fusion-fission process. Gamma rays in coincidence with binary reaction fragments were measured using the high efficiency gamma-ray spectrometer ORGAM at the TANDEM Accelerator facility of I.P.N., Orsay, and the time-of-flight spectrometer for fission fragments (FF) registration CORSET of the Flerov Laboratory of Nuclear Reactions (FLNR), Dubna. The coupling of the ORGAM and CORSET setups offers the unique opportunity of extracting details for characterizing the fusion-fission process and gives information regarding production of neutron-rich heavy nuclei. The FF–γ coincidence method is of better use then the γ – γ coincidence method when dealing with low statistic measurements and also offers the opportunity to precisely correct the Dopler shift for in-flight emitted gamma rays. Evidence of symmetric and asymmetric fission modes were observed in the mass and TKE distributions, occurring due to shell effects in the fragments. Coincident measurements allow for discrimination between the gamma rays by accepting a specific range within the mass distribution of the reaction products. Details regarding the experimental setup, methods of processing the acquisitioned data and preliminary results are presented.
Authors:
 [1] ; ; ; ; ; ;  [2] ; ; ; ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [7] ;  [8]
  1. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, (FLNR JINR) Dubna, Russia and Faculty of Physics, University of Bucharest - P.O. Box MG 11, RO 77125, Bucharest-Magurele (Romania)
  2. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, (FLNR JINR) Dubna (Russian Federation)
  3. IPN, CNRS/IN2P3, Univ. Paris-Sud, 91405 Orsay (France)
  4. Cyclotron Institute, Texas A and M University, College Station, TX 77843-3366 (United States)
  5. Universite Libre de Bruxelles (ULB), Bruxelles (Belgium)
  6. GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5 (France)
  7. Accelerator Laboratory of University of Jyväskylä (JYFL), Jyväskylä (Finland)
  8. Dipartamento di Scienze Fisiche and INFN (INFN-Na), Napoli (Italy)
Publication Date:
OSTI Identifier:
22390994
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1645; Journal Issue: 1; Conference: Carpathian Summer School of Physics 2014, Sinaia (Romania), 13-26 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COINCIDENCE METHODS; COUPLING; DATA ACQUISITION; FISSION; FISSION FRAGMENTS; GAMMA RADIATION; GAMMA SPECTROMETERS; MASS DISTRIBUTION; MEV RANGE; NEUTRONS; SULFUR 34 REACTIONS; TANDEM ELECTROSTATIC ACCELERATORS; TIME-OF-FLIGHT SPECTROMETERS; TUNGSTEN 186 TARGET