1. LAHET code simulations in comparison with bare Pb spallation target experiment
Daniela Henzlova

2. Topics of my work:
simulation of the neutron field around the bare spallation target according to the experimental set-up
study of the various models for description of spallation reaction impelmented in the LAHET code
calculation of the transmutation yields of the 129I
complex study of the capability of LAHET to describe the yields of activation reactions
influence of variation of the beam parameters on the calculated results and their comparison with experiment
LAHET calculations for comparison with experimental data on residual production in Re and Ta targets (for JINR Dubna)

3. LAHET (Los Alamos High Energy Transport Code)
nuclear reaction - three stages:
1. intranuclear cascade via Bertini or ISABEL model
2. preequilibrium decay via MPM (optional)
3. equilibrium evaporation in form of Weisskopf model
transport of low energy neutrons (En<20MeV) via MCNP
parameters used in simulations:
Bertini+MPM+default values of other parameters
study of influence of ISABEL, hybrid MPM and no MPM on calculated results

4. Neutron field around the 50cm Pb spallation target

5. Weight of protons escaping from the spallation target

6. Effect of ISABEL INC, hybrid MPM and no MPM on the calculated neutron field

7. Reaction cross sections
for En<100 (200)MeV -> cross section from MENDL library for neutrons (protons)
for the experimental data, EXFOR library was used
other cross section calculated with LAHET
192Au
190Au
196Au
191Pt
189Pt
190Ir
188Ir
195Pt

8. Reaction cross sections

9. Comparison of 129I transmutation yields

10. Production of Au isotopes in Au foils

11. Influence of LAHET code options on Au isotopes yields

12. Production of Pt isotopes in Au foils

13. Influence of LAHET code options on Pt isotopes yields

14. Production of Ir isotopes in Au foils

15. Influence of beam hit on the comparison

16. Influence of beam hit on the comparison

17. LAHET calculated and experimental residual yields for different proton beam energies

18. Simulations of residual yields in proton induced spallation reactions in Ta and Re targets
proton beam energies: Ep=100, 150, 200, 300, and 660 MeV
target materials: Ta, natRe (1 cm thick in the beam direction, e.g. 21g/cm^2), 185Re and 187Re
parameters of performed simulations:
MPM, no MPM, ISABEL, Bertini+ISABEL

19. LAHET simulation results

20. Summary and further aims
complete LAHET calculations for other isotopes produced in Au foils (up to ????????)
summarize the results on isotope production in Al and Cu foils
continue the study of the beam hit position influence on the comparison with experiment (with extension to include some other beam characteristics – diameter, density..)
revise calculations of iodine transmutation (using MENDL cross sections)