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Mitja Majerle

Seminární soustředění společného doktorského projektu UTEF ČVUT Praha a ÚJF AVČR Řež Transmutation studies on JINR Dubna Phasotron. Mitja Majerle. Introduction. Accelerator Driven Systems are modified classic reactors – extra neutrons are added to the reactor

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Mitja Majerle

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  1. Seminární soustředění společného doktorského projektu UTEF ČVUT Praha a ÚJF AVČR ŘežTransmutation studies on JINR Dubna Phasotron Mitja Majerle

  2. Introduction • Accelerator Driven Systems are modified classic reactors – extra neutrons are added to the reactor • The design of ADS is complicated, simplified and minimized setups for testing – Dubna experiments • Experiments : protons (up to 1.5GeV), heavy metal target, activation detectors • Phasotron experiment : 660 MeV protons, intensive beam – 10 min, samples of 127I and 129I in neutron field, focus on production of short-lifetime isotopes • Analysis is long procedure, includes comparing results with computer simulated results Transmutation studies on JINR Dubna Phasotron

  3. Transmutation studies on JINR Dubna Phasotron

  4. Topics • Overview of the experiment • Analysis : • Number of protons • Neutron field – experiment, simulation • Iodine samples • Simulation codes Transmutation studies on JINR Dubna Phasotron

  5. Transmutation studies on JINR Dubna Phasotron

  6. Experiment characteristics • Date and time: 14th of December 2003 at 16:33 • Intensive beam (2,6·1013 protons/s) of protons with energy 660 MeV from Phasotron • Bare Pb target • The irradiation time : 10 minutes • Measurements of iodine samples and foils in HPGe detectors Transmutation studies on JINR Dubna Phasotron

  7. Transmutation studies on JINR Dubna Phasotron

  8. Transmutation studies on JINR Dubna Phasotron

  9. 1 2 c 4 3 Proton beam • Measured with two foils (Al,Cu – wider spectrum of reactions with protons) – 1,58·1015protons with accuracy 6% • Beam displacement (Al, Au, Bi foils) : beam was shifted upwards, cca 1 cm Transmutation studies on JINR Dubna Phasotron

  10. Neutron field • Al, Au, Bi foils • Reactions : 27Al + n • Spatial and energetic (from thermal (resonance) to ~50 MeV) distribution of neutrons • Maximum : 8-10 cm • Range of proton shower : 30cm * Thresholds from http://t2.lanl.gov/data/data.html Transmutation studies on JINR Dubna Phasotron

  11. Transmutation studies on JINR Dubna Phasotron

  12. Transmutation studies on JINR Dubna Phasotron

  13. Iodine samples • 4 samples (2×127I,2×129I) : 9th and 21st cm along the target • From reactions (n,g) and (n,xn) we get iodine isotopes (all the way to 118I) which then decay (e, b+, IT) towards the line of stability (blue elements) • During the experiment ~1/1011 part of the iodine nuclei transmuted Stable t=hours,days t=years t=minutes Transmutation studies on JINR Dubna Phasotron

  14. Ratios of produced iodine isotopes • 130I produced mostly in 129I samples (n,g) – it decays b- to 130Xe • With the exceptions of 130I and 128I, ratios of produced elements are higher in 127I samples (blue) Transmutation studies on JINR Dubna Phasotron

  15. MCNPX program code • One of simulation codes for which such benchmark tests are done • Used as a tool at planning of experiments • Implemented all the time, experiments are simulated under different versions • Simulated spectrum, calculated yields of produced elements -> simulate the yields • Results suit well experiments (DCM) Transmutation studies on JINR Dubna Phasotron

  16. Transmutation studies on JINR Dubna Phasotron

  17. Conclusion • The experiment on Phasotron will serve as a good benchmark test : • Proton beam – intensive, but well focused • Neutrons – experimental data agree with expectations from previous experiments and with simulation • Iodine – detected short lived isotopes • The data was presented at two international conferences : 7th Session of AER working group for spent fuel transmutation (the Czech Republic), 17th Baldin seminar (Russia) Thank you. Transmutation studies on JINR Dubna Phasotron

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