Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G14: Applications of Nuclear Reactions
8:30 AM–9:54 AM,
Sunday, April 14, 2019
Sheraton
Room: Plaza Court 3
Sponsoring
Unit:
DNP
Chair: Yassid Ayyad-Limonge, Michigan State University
Abstract: G14.00007 : Systematic Studies of Fission Product-Yield Distributions from Neutron Induced Fission*
9:42 AM–9:54 AM
Presenter:
Anton P Tonchev
(Lawrence Livermore Natl Lab)
Authors:
Anton P Tonchev
(Lawrence Livermore Natl Lab)
Jack A Silano
(Lawrence Livermore Natl Lab)
Mark Stoyer
(Lawrence Livermore Natl Lab)
Matthew Gooden
(Los Alamos National Laboratory)
Jerry Wilhelmy
(Los Alamos National Laboratory)
Werner Tornow
(Duke University)
Calvin Howell
(Duke University)
Sean Finch
(Duke University)
FNU Krishichayan
(Duke University)
The distribution of fragment masses following fission is one of the most basic quantities that
has been observed since the discovery of fission by Hahn and Strassmann in 1938, and these
fission product yields (FPYs) are an important source of information that are used for basic and
applied physics. We are performing a self-consistent, high-precision, and time-dependent FPY
data for 235U, 238U, and 239Pu isotopes using monoenergetic and pulsed neutron beams for
incident energies from 0.5 to 15.0 MeV. Using irradiations of varying duration, the energy
dependence of the cumulative and independent yields have been measured for more than two
dozen fission products, with half-lives ranging from minutes to months, on these targets. This
work aims to provide a unique capability for self-consistent measurement of a much broader
range of FPY data relevant to many applications. We will discuss the uniqueness of these FPY
data thus will provide insights crucial for the development of fission theory as well as important
benchmarks for new data evaluations based on high-precision differential fission products.
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
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