HauserFeshbach fission fragment deexcitation with calculated macroscopicmicroscopic mass yields
The HauserFeshbach statistical model is applied to the deexcitation of primary fission fragments using input mass yields calculated with macroscopicmicroscopic models of the potential energy surface. We test the sensitivity of the prompt fission observables to the input mass yields for two important reactions, ^{235}U (n _{th}, f) and ^{239}Pu (n _{th}, f) , for which good experimental data exist. General traits of the mass yields, such as the location of the peaks and their widths, can impact both the prompt neutron and γray multiplicities, as well as their spectra. Specifically, we use several mass yields to determine a linear correlation between the calculated prompt neutron multiplicity $$\bar{v}$$ and the average heavyfragment mass $$\langle$$A _{h}$$\rangle$$ of the input mass yields ∂$$\bar{v}$$/∂ $$\langle$$A _{h}$$\rangle$$ = ± 0.1 (n / f )/u . The mass peak width influences the correlation between the total kinetic energy of the fission fragments and the total number of prompt neutrons emitted, $$\bar{v}_T$$ ( TKE ) . Finally, typical biases on prompt particle observables from using calculated mass yields instead of experimental ones are δ$$\bar{v}$$ = 4 % for the average prompt neutron multiplicity, δ$$\overline{M}_γ$$ = 1% for the average prompt γray multiplicity, δ$$\bar{ε}$$ $$LAB\atop{n}$$ = 1 % for the average outgoing neutron energy, δ$$\bar{ε}_γ$$ = 1 % for the average γray energy, and δ $$\langle$$TKE$$\rangle$$ = 0.4 % for the average total kinetic energy of the fission fragments.
 Authors:

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 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Publication Date:
 Report Number(s):
 LAUR1731000
Journal ID: ISSN 24699985; PRVCAN
 Grant/Contract Number:
 AC5206NA25396
 Type:
 Accepted Manuscript
 Journal Name:
 Physical Review C
 Additional Journal Information:
 Journal Volume: 97; Journal Issue: 3; Journal ID: ISSN 24699985
 Publisher:
 American Physical Society (APS)
 Research Org:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org:
 USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA20)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics
 OSTI Identifier:
 1440483
 Alternate Identifier(s):
 OSTI ID: 1426328
Jaffke, Patrick John, Talou, Patrick, Sierk, Arnold John, and Moller, Peter. HauserFeshbach fission fragment deexcitation with calculated macroscopicmicroscopic mass yields. United States: N. p.,
Web. doi:10.1103/PhysRevC.97.034608.
Jaffke, Patrick John, Talou, Patrick, Sierk, Arnold John, & Moller, Peter. HauserFeshbach fission fragment deexcitation with calculated macroscopicmicroscopic mass yields. United States. doi:10.1103/PhysRevC.97.034608.
Jaffke, Patrick John, Talou, Patrick, Sierk, Arnold John, and Moller, Peter. 2018.
"HauserFeshbach fission fragment deexcitation with calculated macroscopicmicroscopic mass yields". United States.
doi:10.1103/PhysRevC.97.034608.
@article{osti_1440483,
title = {HauserFeshbach fission fragment deexcitation with calculated macroscopicmicroscopic mass yields},
author = {Jaffke, Patrick John and Talou, Patrick and Sierk, Arnold John and Moller, Peter},
abstractNote = {The HauserFeshbach statistical model is applied to the deexcitation of primary fission fragments using input mass yields calculated with macroscopicmicroscopic models of the potential energy surface. We test the sensitivity of the prompt fission observables to the input mass yields for two important reactions, 235U (nth, f) and 239Pu (nth, f) , for which good experimental data exist. General traits of the mass yields, such as the location of the peaks and their widths, can impact both the prompt neutron and γray multiplicities, as well as their spectra. Specifically, we use several mass yields to determine a linear correlation between the calculated prompt neutron multiplicity $\bar{v}$ and the average heavyfragment mass $\langle$Ah$\rangle$ of the input mass yields ∂$\bar{v}$/∂ $\langle$Ah$\rangle$ = ± 0.1 (n / f )/u . The mass peak width influences the correlation between the total kinetic energy of the fission fragments and the total number of prompt neutrons emitted, $\bar{v}_T$ ( TKE ) . Finally, typical biases on prompt particle observables from using calculated mass yields instead of experimental ones are δ$\bar{v}$ = 4 % for the average prompt neutron multiplicity, δ$\overline{M}_γ$ = 1% for the average prompt γray multiplicity, δ$\bar{ε}$ $LAB\atop{n}$ = 1 % for the average outgoing neutron energy, δ$\bar{ε}_γ$ = 1 % for the average γray energy, and δ $\langle$TKE$\rangle$ = 0.4 % for the average total kinetic energy of the fission fragments.},
doi = {10.1103/PhysRevC.97.034608},
journal = {Physical Review C},
number = 3,
volume = 97,
place = {United States},
year = {2018},
month = {3}
}