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

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 JINR Dubna, Russia E+T setup E&T RAW E+T setup Irradiations Method Results Conclusion Gamma - 2 Gamma - 3 Energy + Transmutation Kvinta Ezhik

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

5 Energy+T ransmutation irradiations Beam energy [GeV] Beam particles Year Irradiation time [h:m] Integral beam flux [10 13 ] 0.7 protons 20048: : : : deuterons 20068: : : 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 Activation detectors - (n,xn) reakce AlAuBiCoIn Ta Reaction E Tresh [MeV] Halflife 197 Au (n,2n) 196 Au d 197 Au (n,3n) 195 Au d 197 Au (n,4n) 194 Au h 197 Au (n,5n) 193 Au h 197 Au (n,6n) 192 Au h 197 Au (n,7n) 191 Au h E+T setup Method Water bath method Activation detectors Evaluation MCNPX calculation Results Conclusion

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

9 MCNPX calculations 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 E+T setup Method Water bath method Activation detectors Evaluation MCNPX calculation Results Conclusion

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 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 multiplici tyfrom various models 1.6 GeV2.52GeV4 GeV ModelAuTaAuTaAuTa Bertini-Dresner Bertini - Abla CEM INCL-Abla INCL - Dresner Isabel-Abla Isabel - Dresner 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  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  new material – Ta – successfully used E + T setup Method Results Conclusion

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