Student Practice in JINR Fields of Research Dubna

Student Practice in JINR Fields of Research, Dubna 2011 238 U Fission in subcritical Quinta setup Speaker: Klara Rusin University of Lodz

Group Laboratory of Information Technologies (LIT), Dubna Supervisor : Dr Andrzej Wojciechowski Student: Klara Rusin (Poland)

The name of the project : Energy and Transmutation of Radioactive Wastes (E+T RAW) The main goal of this research program is transmutation of radioactive waste of energetic reactors and using it to energy production Experiment took place in march 2011 in JINR Dubna Members of a group : Russia (JINR Dubna, CPTP Atomenergomash, Moscow, Russia, Obmińsk) Belaruss, Poland, Czech Republic, Germany, France, Greece, Mongolia, Ukraine, Australia. The coordinators: • M. Kadykov, S. Tyutyunnikov, ( JINR) • V. Chilap, (CPTP ”Atomenergomash”)

The Aim of the experiment Research the fission of 238 U nucleus in fast neutron beam • Research spectrum of amount neutron energy • Plutonium production •

An equipment description To mesurement was used track and activaton detector, which was located in aluminium plates in different distance from axis beam There was used deuteron beam accelerated to 2 Ge. V, 4 Ge. V, 6 Ge. V in LHE nucleotron in Dubna

The results from activation detectors was obtain using germanium detectors to measure the energy gamma spectrum. Number of fissions defines by averaging of following fission product yields: 97 Zr (5. 42%), 131 I (3. 64%), 133 I (6. 39%), 143 Ce (4. 26%)

Measuring system

Detector Geometry Red – U 238 Blue- detector

A experiment description Calculation method To calculate number of 238 U(n, f) reaction Nf was used definition: (1) Where φ(E) density of neutron flux calculated by MCNPX 2. 6 based on NDF Data Base, σ(E) –cross section from JENDL (Japanese Evaalueted Nuclear Data Library )

In calculation was used : • Beam profle parameters from proportional chamber. • MCNPX 2. 6 code §ENDF –Evalueted Nuclear Data File § Bertini + FLUKA + Abla • Formula (1) and the U-238(n, f) cross section from JENDL data library

The U-238(n, f) cross section from JENDL Data Base.

Results Fig Comparison neutron production for experiment and models of MCNPX code. Target is made with nat. Pb. Width and diameter of target is equal 35 cm and 15 cm respectively. Experimental data are from Phys. Rev. C 56: 1909 -1917, 1997.

The experimental data presented in this work are from: J. Adam, A. Baldin, N. Vladimirova, N. Gundorin, B. Gus’kov, M. Kadykov, , et al. , Preliminary results of March Nuclotron run on «QUINTA» setup, , JINR, 2011, Dubna SSNT: Solid State Neutron Truck Axial distribution. Comparison of SSNT , Activation methods and calculation results for R=4 cm, beam energy 2 , 4 and 6 Ge. V

Radial distribution. Comparison of SSNT, Activation methods and calculation results for Z=36 cm, beam energy 2 , 4 and 6 Ge. V.

Axial distribution. Comparison of SSNT , Activation methods and calculation results for R=8 cm, beam energy 2 , 4 and 6 Ge. V

Axial distribution. Comparison of SSNT , Activation methods and calculation results for R=12 cm, beam energy 2 , 4 and 6 Ge. V

Conclusion Number of fission of U-238 calculated by Bertini+FLUKA+ABLA code quite agree with experimental data. The differences between experimental data and calculation results includes in the range of experimental errors (about 7%).

Thank you for your attention

For The Curious [1] FLUKA for inelastic collisions of hadrons use difference model - for range 0. 02 -2. 5 Ge. V - preequilibrium model, - for range 2. 5 -4 Ge. V - resonance production and decay model, - for range 4 Ge. V-20 Te. V -Dual Parton Model). (www. fluka. org) The Bertini model [2, 3] and FLUKA codes are swiched at 1. 5 Ge. V for nucleons and pions. (The Bertini model was used below 1, 5 Ge. V and the FLUKA highenergy generator will be used abow this value) [1] www. fluka. org [2] V. SBarashenkov, V. D. Toneev, Vzaimodeistvie vysokoenergeticheskih chastits i atomnyh yader s yadrami, Atomizdat, 1972. [3] N. W. Bertini et al. , Phys. Rev. 1976, V. C 14, P. 590. [4] L. Dresner, “EVAP-A Fortran Program for Calculating the Evaporation of Various Particles from Excited Compound Nuclei, ” Oak Ridge National Laboratory report ORNL-TM-7882 (July 1981).