Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.132503
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Funding
- National Nuclear Security Administration of the U.S. Department of Energy at LANL [DE-AC52-06NA25396]
- Office of Energy Research, Office of High Energy and Nuclear Physics, Nuclear Physics Division of the DOE [DE-AC02-05CH11231]
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Although nuclear fission can be understood qualitatively as an evolution of the nuclear shape, a quantitative description has proven to be very elusive. In particular, until now, there existed no model with demonstrated predictive power for the fission-fragment mass yields. Exploiting the expected strongly damped character of nuclear dynamics, we treat the nuclear shape evolution in analogy with Brownian motion and perform random walks on five-dimensional fission potential-energy surfaces which were calculated previously and are the most comprehensive available. Test applications give good reproduction of highly variable experimental mass yields. This novel general approach requires only a single new global parameter, namely, the critical neck size at which the mass split is frozen in, and the results are remarkably insensitive to its specific value.
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