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Neutron inelastic cross section measurement on 28 Si

Neutron inelastic cross section measurement on 28 Si. Alexandru Negret Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest, ROMANIA. A. Negret - Neutron inelastic cross section measurement on 28 Si. Summary. Introduction Experimental setup Analysis Results

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Neutron inelastic cross section measurement on 28 Si

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  1. Neutron inelastic cross section measurement on 28Si Alexandru Negret Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest, ROMANIA

  2. A. Negret - Neutron inelastic cross section measurement on 28Si Summary Introduction Experimental setup Analysis Results Conclusion

  3. A. Negret - Neutron inelastic cross section measurement on 28Si Introduction Introduction Experimental setup Analysis Results Conclusion

  4. A. Negret - Neutron inelastic cross section measurement on 28Si Neutron data

  5. A. Negret - Neutron inelastic cross section measurement on 28Si Neutron inelastic scattering

  6. A. Negret - Neutron inelastic cross section measurement on 28Si NEA High priority list – 28Si

  7. A. Negret - Neutron inelastic cross section measurement on 28Si Experimental setup Introduction Experimental setup Analysis Results Conclusion

  8. A. Negret - Neutron inelastic cross section measurement on 28Si Overview of the experimental procedure FP3/200 cabin; GAINS + FC 200 m flight path Neutron source

  9. A. Negret - Neutron inelastic cross section measurement on 28Si GELINA neutron source • Electron linac (150 MeV) + 238U target • Pulse width ~1 ns • Repetition rate: 800 Hz • Energy range: 0 – 25 MeV • Gamma flash from • bremsstrahlung • Flight path: 200m • (~20 neutrons/burst)

  10. A. Negret - Neutron inelastic cross section measurement on 28Si GAINS Gamma Array for Inelasic Neutron Scattering • 8 HPGe detectors @ 110° & 150° (Accurate integration of angular distribution up to the sixth order of Legendre polynomials) • TOF technique: • Amplitude  gamma energy • Time  neutron energy • Digitizer-based acquisition • (Acqiris DC440, 420 MS/s, 12 bits) • Beam monitoring: 235U Fission • chamber

  11. A. Negret - Neutron inelastic cross section measurement on 28Si The digitizer-based acquisition • DC440 Acqiris digitizers: • 420 MS/s (2.38 ns/sample) • 12 bits (4096 amplitude channels)

  12. A. Negret - Neutron inelastic cross section measurement on 28Si Experimental problems The digitizer-based acquisition The gamma flash Time resolution Distance from the neutron source : FP = 200m Small neutron flux Long time measurements Stability of the electronics Simplification of the acquisition system

  13. A. Negret - Neutron inelastic cross section measurement on 28Si Analysis Introduction Experimental setup Analysis Results Conclusion

  14. A. Negret - Neutron inelastic cross section measurement on 28Si Overview of the data analysis 8 x HPGE yield FC yield Efficiency: Monte-Carlo simulation Multiple scattering correction: Monte-Carlo simulation Gamma Production cross sections NDS: level scheme Total inelastic cross section Level cross sections

  15. A. Negret - Neutron inelastic cross section measurement on 28Si Efficiency simulation: MCNP vs GEANT4 MCNP simulation by C. Borcea GEANT4 sumulation by D. Deleanu

  16. A. Negret - Neutron inelastic cross section measurement on 28Si sg(10), sg(21), sg(31) g31 stotal inelastic = s(L0) = = sg(10) + sg(21)*0.15 + sg(31)*0.10 L2 s(L2) = sg(21)*1.15 - sg(31)*0.20 g21 g10 L0 From gammas to level cross sections L3 g32 g31 g30 20% 100% 10% L2 g21 g20 100% 15% L1 g10 100% L0

  17. A. Negret - Neutron inelastic cross section measurement on 28Si Limitations • Imprecise Level Scheme (Nuclear Data Sheets) • Isomers in the level scheme • Energy range

  18. A. Negret - Neutron inelastic cross section measurement on 28Si Results Introduction Experimental setup Analysis Results Conclusion

  19. A. Negret - Neutron inelastic cross section measurement on 28Si What did we see? 28Si + n 29Si 28Si+n 28Al + p 25Mg + a

  20. A. Negret - Neutron inelastic cross section measurement on 28Si Gamma production cross sections in 28Si

  21. A. Negret - Neutron inelastic cross section measurement on 28Si Total inelastic cross section

  22. A. Negret - Neutron inelastic cross section measurement on 28Si Level production cross sections

  23. A. Negret - Neutron inelastic cross section measurement on 28Si Gamma cross sections for other channels

  24. A. Negret - Neutron inelastic cross section measurement on 28Si Conclusions Introduction Experimental setup Analysis Results Conclusions

  25. A. Negret - Neutron inelastic cross section measurement on 28Si Conclusions 1/3. We measured: • 4 gamma production cross sections for 28Si(n,n’)28Si • total cross section for 28Si(n,n’)28Si accurate up to 6.2 MeV • 4 level cross sections from 28Si(n,n’)28Si • 1 gamma production cross sections from 28Si(n,p)28Al • 1 gamma production cross sections from 28Si(n,a)25Mg

  26. A. Negret - Neutron inelastic cross section measurement on 28Si Conclusions 2/3. Efficiency procedure We verified the procedure used in the calculation of the efficiency of the HPGe detectors for the extended target: MCNP GEANT

  27. A. Negret - Neutron inelastic cross section measurement on 28Si Conclusions 3/3: New validation of the method

  28. A. Negret - Neutron inelastic cross section measurement on 28Si Thanks Arjan Plompen EC-JRC-IRMM Catalin Borcea IFIN-HH Dana Deleanu IFIN-HH

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