Mitja Majerle NPI CAS Řež, Czech Republic

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Presentation transcript:

Mitja Majerle NPI CAS Řež, Czech Republic XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Experimental studies of transmutation of iodine isotopes by spallation neutrons using JINR Dubna Phasotron Mitja Majerle NPI CAS Řež, Czech Republic

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Introduction 129I is one of the elements in nuclear waste One g line at 35 keV, decay time: ~107 years In 3 GW reactor 5,8 kg 129I per year Samples of 127I and 129I in neutron field Second step of the experiment begun by Vladimir Henzl (1,3 and 2,5 GeV, 2001), Al box now less massive, experiment on Phasotron Special attention on short-lived isotopes High beam intensity Measurements as soon as possible XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Topics Setup – overview of the experiment Number of protons Neutron field – experiment, simulation Iodine samples Conclusion XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Experiment Intensive beam (2,6·1013 protons/s) of protons with energy 660 MeV from Phasotron (http://phasotron.jinr.ru) Date and time: 14th of December 2003 at 16:33 Pb target, without box to moderate fast neutrons The irradiation time : 10 minutes After another 10 minutes start of measurements of I samples and foils on detectors ORTEC and CANBERRA XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Proton beam Measured with two foils (Al,Cu – wider spectrum of reactions with protons) – 1,58·1015 protons with accuracy 6% Beam displacement (Al, Au, Bi foils) : beam was shifted upwards c 1 2 3 4 XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Neutron field Al, Au, Bi foils Reactions : 27Al + n Spatial and energetic (from thermal (resonance) to few 10 MeV) distribution of neutrons 30 cm – range of proton shower Reaction products Threshold* (MeV) 28Al+g 27Mg+p 1,89632 24Na+a 3,24996 26Al+2n 13,54607 ... * Thresholds from http://t2.lanl.gov/data/data.html XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS 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 Other elements (Sb, Te) also produced, but not yet analyzed Stable t=hours,days t=years XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS t=minutes

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) 122I has short decay time (3.63m), found but not yet analyzed properly 120I lower than expected – problem : two isomers with almost the same lines XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS

XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS Conclusion Proton beam – the experiment with the highest integral flux of protons (1,6·1015) and high intensive beam enabled us to study very short lived isotopes Neutrons – simulation gives us very nice description of experimental data with the exception of thermal neutrons. To do : analysis of data from Bi foils Iodine – the experiment was pointed to detect short lived isotopes, we detected 118I, 122I; analysis of decay products of these isotope Program for on-line g spectrum recognition (automatic calculation of COI) Thank you. XVII INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS