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INFN Bari N. Colonna G. Tagliente INFN Trieste K. Fujii P.M. Milazzo

INFN Bari N. Colonna G. Tagliente INFN Trieste K. Fujii P.M. Milazzo. Zirconium III: The conclusion. Physics case s-process analysis of great interest in stellar modeling (e.g. evolution of Red Giant stars) nuclear reactor design purpose nuclear waste transmutation.

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INFN Bari N. Colonna G. Tagliente INFN Trieste K. Fujii P.M. Milazzo

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  1. INFN Bari N. Colonna G. Tagliente INFN Trieste K. Fujii P.M. Milazzo Zirconium III: The conclusion

  2. Physics cases-process analysis of great interest in stellar modeling (e.g. evolution of Red Giant stars)nuclear reactor design purpose nuclear waste transmutation 90 neutron magic number (N=50) Act as a bottle neck for the reaction flow towards heavier elements 90, 91, 92, 93, 94 Low-neutron capture cross sections, predominantly of s-process origin (existing data have uncertainties larger than 10%) 93 radioactive isotope One of the major long-lived fission products (T½ = 1.5 Myr) Used in reactor’s structural materials 96 r-process only Relevant in the study of pulsing AGB stars

  3. Physics case, Nuclear Astrophysics (n,g) x-sections of Zr Bottleneck in the s-process flow at N=50 neutron magic number Small x-sections Normalization of s-process abundance Probing the neutron exposure and neutron flux in Red Giant Stars TOF 08

  4. Zr capture Yields Zr Yield Overall background Stable isotopes, 2003 93Zr 93Zr Natural radioactivity of the sample

  5. Resonance analysis 2 4 3 1 3 4 1 2 Zr-92 data Resonance Fit Normalization 197Au 4.9eV N.F.(92Zr)=0.6219 SAMMY fit of 92Zr Estimated resonance parameters E, Γg, Γn

  6. Resonance analysistypical examples 94Zr En=58.7keV 90 91 96 94 … multiple scattering correction, Doppler broadening and instrumental resolution were included in the analysis

  7. Data analysis Sntof14%lower than the previous data Gnntof7%lower than the previous data

  8. Data analysis Sntof19%lower than the previous data Gnntof3%lower than the previous data

  9. Data analysis Sntof14%lower than the previous data Gnntof1%lower than the previous data

  10. Data analysis Sntof4%higher than the previous data Gnntof3%higher than the previous data

  11. Data analysis Sntof25%lower than the previous data Gnntof12%lower than the previous data

  12. Data analysis Mughabghab 2006 Mughabghab 1986

  13. 93Zr • Double canning: Ti and Al • Isotopic composition: plus other impurities as Hf, Mo, etc.

  14. Data analysis Sntof4%lower than the previous data Gnntof 3%higher than the previous data

  15. It should be possible to measure in the Zr93 sample also the other isotope as 91,92,94,96

  16. Resonances cross check 91Zr

  17. 91Zr

  18. Resonances cross check 90Zr 94Zr

  19. 90Zr

  20. Resonances cross check 92Zr

  21. Data analysis

  22. Data analysisMACS @ 30 KeV

  23. Conclusions The analysis of all the isotopes has been completed Zr90 bottleneck in the s-process reaction flow submitted to PRC Zr91 neutron valence effect almost ready to be submitted to EB Paper in preparation for 92 94 93 Still some analysis needed for Zr96

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