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Calculations of Neutron Yield and Gamma Rays Intensity by GEANT4

This study by Vahagn Ivanyan on October 23, 2019, focuses on the energy spectra of gamma rays and neutrons produced after lead shielding in different beryllium target thicknesses. The simulations were carried out using GEANT4 software to analyze the interaction of particles in the C18/18.7Li or 9Be target through the Be(p,xn) reactions. The results show the energy spectra of gamma rays after lead, neutron production after lead for different beryllium targets, and the ratio of gamma rays to neutrons in various shielding configurations. The study concludes that a 2.5mm beryllium target followed by 1.27cm lead thickness is optimal. Future plans include developing a reflector model to enhance neutron beam formation using GEANT4.

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Calculations of Neutron Yield and Gamma Rays Intensity by GEANT4

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  1. Yerevan Physics Institute Calculations of Neutron Yield and Gamma Rays Intensity by GEANT4 Vahagn Ivanyan 23 October 2019

  2. Introduction 1.Calculated Energy spectra of Gamma Rays after Lead for 0.5mm and 2.5mm Be Targets 2.Calculated Energy spectra of Neutrons after Lead for 0.5mm and 2.5 mm Be Targets 3.Energy Spectra of Gamma Rays with Energy Spectra of Neutrons after 0.5 mm Be, 2.5mm Be and Lead 4.Energy Spectra of Neutrons and Gamma Rays 2 m from the Target 5.Conclusion and Future Plans

  3. General view of CYCLONE C18/18

  4. 7Li(180.54°C)or9Be(1287°C)

  5. Be(p,xn) Reactions

  6. GEANT4(Geometry and Tracking) G4RunManager DetectorConstruction PrimaryGeneratorAction PhysicsList Geometry Tracking Physics

  7. Be Detector Air Tube of C18/18

  8. 1. 3cm Air and 0.5 mm Be 2. 3cm Air and 1 mm Be 3. 3cm Air and 2.5 mm Be

  9. 1Energy spectra of Gamma Rays after Lead for 0.5mm Be Target 1) N1 = 274775 after 3cm Air 0.5mm Be 2) N2 = 153017 after 3cm Air 0.5mm Be 0.5 cm Lead 3) N3 = 90935 after 3cm Air 0.5mm Be 1.27 cm Lead 4) N4 = 56823 after3cm Air 0.5mm Be 2 cm Lead

  10. Energy spectra of Gamma Rays after Lead for 2.5mm Be target 1) N1 = 431309 after 3cm Air 2.5mm Be 2) N2 = 194582 after 3cm Air 2.5mm Be 0.5 cm Lead 3) N3 = 103887 after 3cm Air 2.5mm Be 1.27 cm Lead 4) N4 = 62027 after3cm Air 2.5mm Be 2 cm Lead

  11. 2 Energy spectra of Neutrons after Lead for 0.5 mm Be Target 1) N1 = 147811 after 3cm Air 0.5mm Be 2) N2 =145733 after 3cm Air 0.5mm Be 0.5 cm Lead 3) N3 = 105589 after 3cm Air 0.5mm Be 1.27 cm Lead 4) N4 = 75439 after3cm Air 0.5mm Be 2 cm Lead

  12. Energy Spectrum of Protons After 0.5 mm Be

  13. Energy spectra of Neutrons after Lead for 2.5 mm Be Target 1) N1 = 235235 after 3cm Air 2.5mm Be 2) N2 = 193297 after 3cm Air 2.5mm Be 0.5 cm Lead 3) N3 = 140238 after 3cm Air 2.5mm Be 1.27 cm Lead 4) N4 = 100936 after3cm Air 2.5mm Be 2 cm Lead

  14. 3Energy Spectra of Gamma Rays with Energy Spectra of Neutrons after 0.5 mm Be and Lead • Gamma Rays after 3cm Air 0.5mm Be • Neutrons after 3cm Air 0.5mm Be NGamma/NNeutron = 1.86

  15. Gamma Rays after 3cm Air, 0.5mm Be and 5mm Pb • Neutrons after 3cm Air, 0.5mm Be and 5mm Pb NGamma/NNeutron = 1.05

  16. Gamma Rays after 3cm Air, 0.5mm Be and 1.27cm Pb • Neutrons after 3cm Air, 0.5mm Be and 1.27m Pb NGamma/NNeutron = 0.86

  17. Gamma Rays after 3cm Air, 0.5mm Be and 2cm Pb • Neutrons after 3cm Air, 0.5mm Be and 2cm Pb NGamma/NNeutron = 0.75

  18. Energy Spectra of Gamma Rays with Energy Spectra of Neutrons after 2.5 mm Be and Lead • Gamma Rays after 3cm Air, 2.5mm Be • Neutrons after 3cm Air, 2.5mm Be NGamma/NNeutron = 1.83

  19. Gamma Rays after 3cm Air, 2.5mm Be and 5mm Pb • Neutrons after 3cm Air, 2.5mm Be and 5mm Pb NGamma/NNeutron = 1.01

  20. Gamma Rays after 3cm Air, 2.5mm Be and 1.27cm Pb • Neutrons after 3cm Air, 2.5mm Be and 1.27cm Pb NGamma/NNeutron = 0.74

  21. Gamma Rays after 3cm Air, 2.5mm Be and 2cm Pb • Neutrons after 3cm Air, 2.5mm Be and 2cm Pb NGamma/NNeutron = 0.61

  22. Detected Neutrons 2 meter from the Target • Neutrons after 3cm Air 2.5mm Be • Neutrons after 3cm Air 2.5mm Be 0.5cm Pb • Neutrons after 3cm Air 2.5mm Be 1.27cm Pb • Neutrons after 3cm Air 2.5mm Be 2cm Pb

  23. Neutrons and Gamma Rays 2 m from the Target Gamma Rays NGamma/NNeutron = 1.19 Neutrons

  24. Gamma Rays NGamma/NNeutron = 0.61 Neutrons

  25. NGamma/NNeutron = 0.39 Neutrons Gamma Rays

  26. NGamma/NNeutron =0.3 Neutrons Gamma Rays

  27. Cunclusion 1. Target(Be) thickness must be 2.5mm. 2. After Target must be installed Lead with 1.27cm thickness. Future Plans *We need Reflector for Neutron beam formation. * The model of the Reflector must be created by Geant4.

  28. THANK YOU

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