Stopping Force Analysis of 235U Elemental Fission Product Yields for En = 0.11–92.4 MeV - INSPIRE

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Stopping Force Analysis of 235U Elemental Fission Product Yields for En = 0.11–92.4 MeV

FissionTPC IFPY and
NIFFTE

Collaborations

•

M.E. Moore
(
- PNL, Richland
)

Oct, 2022

28 pages

Published in:

Nucl.Data Sheets 184 (2022) 1-28

Published: Oct, 2022

DOI:

10.1016/j.nds.2022.08.001 (publication)

View in:

Nuclear Science References

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Abstract: (Elsevier Inc.)

Most evaluated elemental fission product yield distributions are not experimentally measured. Instead, the majority of evaluated distributions are based on analytic expressions of the Zp-model for relevant cumulative yields. Here we report independent elemental fission product yield distributions of a ²³⁵U target for incident neutron energies ranging from 0.11 MeV through 92.4 MeV. Atomic numbers are calculated by an approach that combines a 2E analysis with a stopping force analysis method, developed within this paper. These analyses are applied to more than 6.1 × 10⁶ fission fragment ionization tracks captured within the NIFFTE (Neutron Induced Fission Fragment Tracking Experiment) collaboration fission time projection chamber (fissionTPC). A 3-Z resolution was obtained with the fissionTPC spatial and energy resolutions. Tabulated results are presented for the atomic yield and experimentally derived Zp values as a function of pre-neutron-emission fragment masses for the complete range of incident neutron energies. The stopping-force-derived Zp values tend to support the unchanged charge distribution theory within uncertainty.

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