Mitja Majerle NPI CAS Řež, The Czech Republic

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Presentation transcript:

Mitja Majerle NPI CAS Řež, The Czech Republic M&C 2005 Avignon September 12-15, 2005 MCNPX STUDIES OF SPALLATION NEUTRON PRODUCTION ON A THICK LEAD TARGET Mitja Majerle NPI CAS Řež, The Czech Republic

M&C 2005, Avignon, September 12-15, 2005 Introduction Generally : Experiments with high-energy protons on heavy targets (~ADS), spallation neutrons, direct beam We measure transmutation possibilities, neutron fields, we compare data with model simulations Focus – The PHASOTRON experiment : Protons, neutron field (threshold detectors) ... and the simulations What and how we calculate Comparison with the experiment The influence of the setup parts M&C 2005, Avignon, September 12-15, 2005

Yields of produced elements are detectable in g-detectors Neutrons and protons react with detectors: (n,g), (n,2n), (n,xn), (n,a), (p,n), (p,a), ... Yields of produced elements are detectable in g-detectors M&C 2005, Avignon, September 12-15, 2005

M&C 2005, Avignon, September 12-15, 2005 Experimental results B=Number of produced nuclei in 1 g of material per one incident proton Preliminary results M&C 2005, Avignon, September 12-15, 2005

Simulations, how/what we calculate MCNPX code v. 2.4.0 (on Linux, parallel computing) Input : setup geometry starting conditions Output 1: neutron distribution Cross-section libraries (Au, Al - ENDF; Bi - experimental; Iodine - ?) Output 2: masses of produced elements or B-values M&C 2005, Avignon, September 12-15, 2005

Neutron spectra + cross-sections We can convolute the calculated neutron spectrum with the cross-section for a given reaction (SSW+HTAPE3X+convolution). 197Au(n,2n)196Au 27Al(n,a)24Na 197Au(n,g)198Au Computer can convolute the spectrum with cross-sections and outputs B (F4+FM tally). M&C 2005, Avignon, September 12-15, 2005

Calculations vs. experiment Calculated values in comparison with the experiment for 27Al(n,a)24Na Ratios between calculated and experimental values for 24Na, 196Au, 194Au M&C 2005, Avignon, September 12-15, 2005

Influence of the setup parts No walls Concrete walls : Neutrons are moderated and reflected back Walls M&C 2005, Avignon, September 12-15, 2005

Influence of other simplifications Extensive calculation tests on PHASOTRON and EPT setup revealed that : HTAPE3X and F4 methods results do not always agree. Beam profile and displacement influence the neutron field (3 mm ~ 5%). The use of different models (BERTINI, CEM, ISABEL) ~ 10%. Detectors minimally influence the neutron field. Metal holders, tables, ... have minimal influence. ... M&C 2005, Avignon, September 12-15, 2005

M&C 2005, Avignon, September 12-15, 2005 Parallel processing The use of parallel processing (PVM) speeds up our calculations significantly. M&C 2005, Avignon, September 12-15, 2005

M&C 2005, Avignon, September 12-15, 2005 Conclusion We try to imitate an ADS systems with the setup We can describe new, similar systems with the computer with the accuracy (50%) Thank you. M&C 2005, Avignon, September 12-15, 2005