Observation of the competing fission modes in 178Pt
Fragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced from the calculated fragment velocities. The 178Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction 36Ar + 142Nd, at beam energies of 155, 170 and 180 MeV. The data are indicative of a mixture of the mass-asymmetric and mass-symmetric fission modes associated with higher and lower total kinetic energies of the fragments, respectively. The measured fragment yields are dominated by asymmetric mass splits, with the symmetric mode contributing at the level of ≈ 1/3. This justifies the first observation of a multimodal fission in the sub-lead region. Most probable experimental fragment-mass split of the asymmetric mode, $$\mathcal{A_{L}/A_{H}}$$ ≈ 79/99, is well reproduced by nuclear density functional theory using the UNEDF1-HFB and D1S density functionals. The symmetric mode is associated by theory with very elongated fission fragments, which is consistent with the observed total kinetic energy/fragment mass correlation.
- Research Organization:
- Michigan State Univ., East Lansing, MI (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0002847; SC0018083; NA0003885
- OSTI ID:
- 1547759
- Alternate ID(s):
- OSTI ID: 1513814
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 790 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
Asymmetric fission around lead: The case of
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journal | December 2019 |
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