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Competition between mass-symmetric and asymmetric fission modes in 258Md produced in the 4He+254Es reaction

Journal Article · · Physical Review. C
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  1. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center
  2. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Tokyo Institute of Technology (Japan)
  3. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Niigata University (Japan)
  4. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Ibaraki University (Japan)
  5. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Osaka Univ. (Japan)
  6. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; University of York (United Kingdom)
  7. RIKEN Nishina Center, Saitama (Japan); Kyushu University, Fukuoka (Japan)
  8. RIKEN Nishina Center, Saitama (Japan)
  9. Kindai University, Osaka (Japan)
  10. Tohoku University, Sendai (Japan)
  11. Kyushu University, Fukuoka (Japan)
  12. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations
Earlier studies of spontaneous fission of heavy actinides found that the fission-fragment mass distribution suddenly changes from predominantly asymmetric to symmetric, when the mass number of the fissioning nucleus becomes larger than Ac = 257. We have measured for the first time fission-fragment mass and totalkinetic-energy (TKE) distributions of the excited compound nucleus 258Md∗ (Z = 101), populated in the reaction 4He + 254Es, using the rare radioactive target isotope 254Es with a short half-life, T1/2 = 275.7 d. The fission of 258Md∗ can be interpreted as involving three fission modes: one mass-asymmetric and two mass-symmetric fission modes, the latter two are manifested by different TKE values. In this assumption, symmetric and asymmetric fission modes have nearly similar yields at the excitation energy of 15.0 MeV. The spectrum of 18.0 MeV can be explained as due to the increase of asymmetric fission mode.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Japan Atomic Energy Agency; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2573568
Alternate ID(s):
OSTI ID: 2560917
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 111; ISSN 2469-9985; ISSN 2469-9993
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

A ≥ 220
fission
nuclear reactions