application nuclear data needs tim johnson, libby mccutchan, alejandro sonzogni national nuclear...
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![Page 1: Application Nuclear Data Needs Tim Johnson, Libby McCutchan, Alejandro Sonzogni National Nuclear Data Center](https://reader035.vdocuments.site/reader035/viewer/2022062408/56649f1e5503460f94c35c57/html5/thumbnails/1.jpg)
Application Nuclear Data Needs
Tim Johnson, Libby McCutchan, Alejandro Sonzogni
National Nuclear Data Center
![Page 2: Application Nuclear Data Needs Tim Johnson, Libby McCutchan, Alejandro Sonzogni National Nuclear Data Center](https://reader035.vdocuments.site/reader035/viewer/2022062408/56649f1e5503460f94c35c57/html5/thumbnails/2.jpg)
Beta Delayed Neutron Covariances #2 - Alejandro Sonzogni
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Beta Delayed Neutron Covariances #3 - Alejandro Sonzogni
Different radiation types, different issues…
Gamma rays Gamma decay heat, forensics
Beta transititions Beta decay heat, antineutrinos
Beta delayed neutrons Delayed nu-bars
All of them very correlated, macroscopic measurements need precise experimental values from places like ATLAS
Impact of TAGS data (Greenwod et al, Algora et al) has been crucial.
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Beta Delayed Neutron Covariances #4 - Alejandro Sonzogni
Anti-neutrino Signal, neutrino spectrum x cross section
235,238U and 239Pu produce a different signal, in shape, maxima and multiplicity
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Beta Delayed Neutron Covariances #5 - Alejandro Sonzogni
NNDC calculations on the Daya-Bay signal shape = spectrum x cross section
235U signal has a shoulder at around 6 MeV
F.P. An, PRL 108, 171803 (2012),
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Beta Delayed Neutron Covariances #6 - Alejandro Sonzogni
Following Loaiza et al. & Than Dat et al., the recommended delayed nubars (delayed average neutron multiplicity per fission) are plotted for a number of systems.
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Beta Delayed Neutron Covariances #7 - Alejandro Sonzogni
Many bn emitters have high fission yield values, in particular Br (Z=35), Rb (Z=37), I (Z=53) and Cs (Z=55)
Chart colored by 235U fission yields, highlighted by Qbn>0
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Beta Delayed Neutron Covariances #8 - Alejandro Sonzogni
Contributions from nuclei with different degrees of Z and N evenness
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Beta Delayed Neutron Covariances #9 - Alejandro Sonzogni
Contributions from nuclei from the Light and the Heavy fission fragments
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Beta Delayed Neutron Covariances #10 - Alejandro Sonzogni
Same plot as before, but for delayed nubars
Odd-ZEven-N nuclides, such as 87Br contribute ~50-65%.
232Th 238U 235U 241Pu238Np
233U 239Pu
252Cf
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Beta Delayed Neutron Covariances #11 - Alejandro Sonzogni
232Th 238U
As before, but plotting lighter and heavier fission fragments contributions
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Beta Delayed Neutron Covariances #12 - Alejandro Sonzogni
Another example, 147Nd decay
Ib <0.15 % or Ib<5 %
Eg=531.0 Ig=13.4 (3)%
Eg=91.1 Ig=28.1 (7)% a=2.03
Cumulative fission yield=2.25%
A precise knowledge of the GS to GS Ib and 91.1 Ig is needed
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Beta Delayed Neutron Covariances #13 - Alejandro Sonzogni
Conclusions
Precise Decay Schemes are needed for many neutron rich nuclides, including:
a) TAGS data.b) Beta Shapes, beta absolute intensities, in particular ground
state to ground state.c) Beta-delayed Neutron Probabilities and Neutron Spectra.d) Gamma energy and absolute intensities.