Ondřej Svoboda

1. Nuclear Physics Institute, Academy of Sciences of the Czech Republic Department of Nuclear Reactors, Faculty of Nuclear Sciences andPhysical Engineering, Czech Technical University in Prague Comparison of neutron production on lead-uranium setup irradiated by protons and deuterons with different energies Ondřej Svoboda

2. Outline E + T setup Method Results Conclusion • Energy + Transmutation setup • Used method and neutron measurement • Results • Conclusion

3. „Energy & Transmutation of Radioactive Waste“ collaboration Ezhik • E+T setup • E&T RAW • E+T setup • Irradiations • Method • Results • Conclusion JINR Dubna, Russia Gamma - 2 Gamma - 3 Kvinta Energy + Transmutation

4. Setup Energy + Transmutation • E+T setup • E&T RAW • E+T setup • Irradiations • Method • Results • Conclusion

5. Energy+Transmutation irradiations • E+T setup • E&T RAW • E+T setup • Irradiations • Method • Results • Conclusion

6. Neutron multiplicity – water bath method • For targets it is usually used a „water bath method“: • target is immersed in big water bath, large set of activation detectors is placed all around to measure thermalized neutrons • -> Not usable in our case! • Water and large set of foils can be replaced by small set and simulation (ref: van den Meer – NIM B 217(2004)) • We used biological shielding as some special type of water bath (neglecting front and back openings)…and 20 pieces of activation detectors combined with MCNPX calculation. • E+T setup • Method • Water bath method • Activation detectors • Evaluation • MCNPX calculation • Results • Conclusion

7. Ta Al Au Bi Co In Activation detectors - (n,xn) and (n,g) reactions • E+T setup • Method • Water bath method • Activation detectors • Evaluation • MCNPX calculation • Results • Conclusion

8. Evaluation process • E+T setup • Method • Water bath method • Activation detectors • Evaluation • MCNPX calculation • Results • Conclusion HPGe Irradiation Spectra evaluation NYield Corrections MCNPX 2.7.a Neutron multiplicity

9. MCNPX calculations • E+T setup • Method • Water bath method • Activation detectors • Evaluation • MCNPX calculation • Results • Conclusion • Used version MCNPX 2.7.a • Most preferred combination of models – INCL-Abla (gives the best agreement between experiment and simulation) • All available models were tested

10. Bare Pb target multiplicity • E+T setup • Method • Results • Bare Pb target • E+T multiplicity • E+T multiplicity per GeV • MCNPX models • Multiplicity in various models • Conclusion

11. E+T neutron multiplicity • E+T setup • Method • Results • Bare Pb target • E+T multiplicity • E+T multiplicity per GeV • MCNPX models • Multiplicity in various models • Conclusion

12. E+T neutron multiplicity • E+T setup • Method • Results • Bare Pb target • E+T multiplicity • E+T multiplicity per GeV • MCNPX models • Multiplicity in various models • Conclusion

13. Simulated multiplicity – various models in MCNPX • E+T setup • Method • Results • Bare Pb target • E+T multiplicity • E+T multiplicity per GeV • MCNPX models • Multiplicity in various models • Conclusion

14. Neutron multiplicityfrom various models • E+T setup • Method • Results • Bare Pb target • E+T multiplicity • E+T multiplicity per GeV • MCNPX models • Multiplicity in various models • Conclusion

15. Conclusion E + T setup Method Results Conclusion • we studied neutron multiplicity in setup consisting of thick lead target and uranium blanket • proven applicability and consistency of the method in our case • studied dependency on various models in MCNPX • new material – Ta – successfully used

16. Acknowledgements • This work was supported from following grants: • GA ASCR K2067107 • GACR 202/03/H043 • CTU0808214 Thank you for your attention..