Ni-64 MACS case

The Ni-64 MACS suffers for severe discrepancies, amongst the databases available in literature.

img2cab38de702ba7f68345473f97eef352.png


The MACS up to kT=100 keV is completely determined by the resolved resonance region, extending in n+64Ni up to En ~ 500 keV.

img7922e5d62f73cc812fd13cc3b4ab99a0.gif

img484766c90e511b49c56dd9ce971ccad1.png
kT = 8 keV
img4590e38ac7af71b743b19736a87e53eb.png
kT = 30 keV


In the specific case of kT = 8 keV and kT = 30 keV, the relevant resonances are the first six resonances in Ni-64. Their parameters are reported in the Atlas of Neutron Resonances[1]. For unknown reasons, the nuclear data evaluations of ENDF/B-8.0 or JENDl-4.0 reports considerably higher values of the capture strengths of the first six resonances. That is the origin of the discrepancies between the nuclear data libraries and the KADONIS evaluation, which is based on activation measurements.

A new TOF measurement is, therefore called for.

The capture cross section data files for the ENDF/B-8.0 (ni64ng.b80) and the same with the first 6 resonances replaced by the Mughabghab parameters (ni64ng.mug) are available in the respective links for calculations of the expected yields in EAR2.

References

[1] Atlas of Neutron Resonances
Resonance Properties and Thermal Cross Sections Z = 160
Sixth Edition, Volume 1
S.F. Mughabghab
National Nuclear Data Center Brookhaven National Laboratory Upton, NY 11973-5000

-- AlbertoMengoni - 2021-07-12

Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2021-07-13 - AlbertoMengoni
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Main All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2023 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback