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Title: Excitation energy dependence of fragment-mass distributions from fission of 180,190Hg formed in fusion reactions of 36Ar + 144,154Sm

Journal Article · · Physics Letters B
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [1];  [1];  [8];  [9];  [9];  [1];  [1];  [10];  [11];  [12];  [13];  [14];  [15] more »;  [16] « less
  1. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center
  2. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Univ. of York (United Kingdom). Dept. of Physics; Univ. of the West of Scotland, Paisley, Renfrewshire (United Kingdom)
  3. Univ. of the West of Scotland, Paisley, Renfrewshire (United Kingdom)
  4. Johannes Gutenberg Univ., Mainz (Germany). Inst. of Nuclear Chemistry; Helmholtz Helmholtz Inst. Mainz, Mainz (Germany)
  5. Johannes Gutenberg Univ., Mainz (Germany). Inst. of Nuclear Chemistry; GSI-Helmholtz Centre for Heavy Ion Research, Darmstadt (Germany); Helmholtz Helmholtz Inst. Mainz, Mainz (Germany)
  6. Katholieke Univ. Leuven, Heverlee (Belgium). Inst. for Nuclear and Radiation Physics; Belgian Nuclear Research Center (SCK-CEN), Mol (Belgium)
  7. GSI-Helmholtz Centre for Heavy Ion Research, Darmstadt (Germany); Helmholtz Helmholtz Inst. Mainz, Mainz (Germany)
  8. Helmholtz Helmholtz Inst. Mainz, Mainz (Germany); GSI-Helmholtz Centre for Heavy Ion Research, Darmstadt (Germany)
  9. GSI-Helmholtz Centre for Heavy Ion Research, Darmstadt (Germany)
  10. Kyoto Univ., Osaka (Japan). Research Reactor Inst.
  11. Univ. of the West of Scotland, Paisley, Renfrewshire (United Kingdom); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  12. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation). Flerov Lab. of Nuclear Reactions
  13. Univ. of Bordeaux (France)
  14. Katholieke Univ. Leuven, Heverlee (Belgium). Inst. for Nuclear and Radiation Physics
  15. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; RIKEN, Wako (Japan). Nishina-Center
  16. China Inst. of Atomic Energy, Bejing (China)
+ Show Author Affiliations

Mass distributions of fission fragments from the compound nuclei 180Hg and 190 Hg formed in fusion reactions 36Ar + 144 Smand 36Ar + 154Sm, respectively, were measured at initial excitation energies of E*(180Hg) = 33-66 MeV and E*(190Hg) = 48-71 MeV. In the fission of 180Hg, the mass spectra were well reproduced by assuming only an asymmetric-mass division, with most probable light and heavy fragment masses $$\overline{A}_L$$/$$\overline{A}_H$$ = 79/101. The mass asymmetry for 180Hg agrees well with that obtained in the low-energy β+/EC-delayed fission of 180Tl, from our earlier ISOLDE(CERN) experiment. Fission of 190Hg is found to proceed in a similar way, delivering the mass asymmetry of$$\overline{A}_L$$/$$\overline{A}_H$$ = 83/107, throughout the measured excitation energy range. The persistence as a function of excitation energy of the mass-asymmetric fission for both proton-rich Hg isotopes gives strong evidence for the survival of microscopic effects up to effective excitation energies of compound nuclei as high as 40 MeV. In conclusion, this behavior is different from fission of actinide nuclei and heavier mercury isotope 198Hg.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; Science and Technology Facilities Council (STFC) (United Kingdom); FWO-Vlaanderen, Belgium
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1339370
Journal Information:
Physics Letters B, Vol. 748, Issue C; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

References (32)

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Cited By (6)

Asymmetric fission around lead: The case of Po 198 journal December 2019
Performance of the Fourier shape parametrization for the fission process journal March 2017
Review on the progress in nuclear fission—experimental methods and theoretical descriptions journal September 2018
Nuclear fission: a review of experimental advances and phenomenology journal November 2017
Insight into excitation energy and structure effects in fission from isotopic information in fission yields journal February 2019
Search for stabilizing effects of the Z = 82 shell closure against fission journal June 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
(180
190) Hg
Fusion-fission
Mass asymmetric fission