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Energy dependent calculations of fission product, prompt, and delayed neutron yields for neutron induced fission on 235U, 238U, and 239Pu

Journal Article · · Journal of Nuclear Science and Technology (Tokyo)
 [1];  [2];  [2];  [3]
  1. International Atomic Energy Agency (IAEA), Vienna (Austria)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Tokyo Institute of Technology (Japan)
+ Show Author Affiliations
In this article, we perform energy-dependent calculations of independent and cumulative fission product yields for 235U, 238U, and 239Pu in the first chance fission region. Starting with the primary fission fragment distributions taken from available experimental data and analytical functions based on assumptions for the excitation energy and spin-parity distributions, the Hauser-Feshbach statistical decay treatment for fission fragment de-excitation is applied to more than 1,000 fission fragments for the incident neutron energies up to 5 MeV. The calculated independent yields are then used as an input of β-decay calculations to produce the cumulative yield, and summation calculations are performed. Model parameters in these procedures are adjusted by applying the Bayesian technique at the thermal energy for 235U and 239Pu and in the fast energy range for 238U. The calculated fission observable quantities, such as the energy-dependent cumulative yields, and prompt and delayed neutron yields, are compared with available experimental data. We also study the possible impact of the second chance fission opening on the energy dependence of the delayed neutron yield by on the opening of second chance fission on the energy dependence calculation.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1900219
Alternate ID(s):
OSTI ID: 23178403
Report Number(s):
LA-UR-21-20820
Journal Information:
Journal of Nuclear Science and Technology (Tokyo), Journal Name: Journal of Nuclear Science and Technology (Tokyo) Journal Issue: 1 Vol. 59; ISSN 0022-3131
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (14)

Table 1(p. 6)table Table 1
Table 2(p. 6)table Table 2
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Table 5(p. 14)table Table 5
Table 6(p. 15)table Table 6
Figure 2(p. 18)figure Figure 2
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Figure 7(p. 24)figure Figure 7
Figure 8(p. 26)figure Figure 8

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Delayed Neutron Yield
Fission Product Yield
Hauser-Feshbach Stastical Decay
Nuclear Criticality Safety Program (NCSP)
Nuclear Data
Prompt Neutron Multiplicity
β Decay