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Role of Multichance Fission in the Description of Fission-Fragment Mass Distributions at High Energies
- Source :
- Phys.Rev.Lett., Phys.Rev.Lett., 2017, 119 (22), pp.222501. ⟨10.1103/PhysRevLett.119.222501⟩
- Publication Year :
- 2017
-
Abstract
- Fission-fragment mass distributions were measured for $^{237--240}\mathrm{U}$, $^{239--242}\mathrm{Np}$, and $^{241--244}\mathrm{Pu}$ populated in the excitation-energy range from 10 to 60 MeV by multinucleon transfer channels in the reaction $^{18}\mathrm{O}+^{238}\mathrm{U}$ at the Japan Atomic Energy Agency tandem facility. Among them, the data for $^{240}\mathrm{U}$ and $^{240,241,242}\mathrm{Np}$ were observed for the first time. It was found that the mass distributions for all the studied nuclides maintain a double-humped shape up to the highest measured energy in contrast to expectations of predominantly symmetric fission due to the washing out of nuclear shell effects. From a comparison with the dynamical calculation based on the fluctuation-dissipation model, this behavior of the mass distributions was unambiguously attributed to the effect of multichance fission.
- Subjects :
- Physics
Range (particle radiation)
010308 nuclear & particles physics
Fission
General Physics and Astronomy
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
7. Clean energy
01 natural sciences
0103 physical sciences
Nuclide
Atomic physics
Nuclear Experiment
010306 general physics
Energy (signal processing)
Subjects
Details
- ISSN :
- 10797114
- Volume :
- 119
- Issue :
- 22
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....480b23457fd8f8087e48784c96afdc5f