CENTRO ATOMICO BARILOCHE - ARGENTINA. MODELING AND MEASUREMENTS OF NEUTRONIC PROPERTIES OF NEW CRYOGENIC NEUTRON MODERATORS CENTRO ATOMICO BARILOCHE -

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Presentation transcript:

CENTRO ATOMICO BARILOCHE - ARGENTINA

MODELING AND MEASUREMENTS OF NEUTRONIC PROPERTIES OF NEW CRYOGENIC NEUTRON MODERATORS CENTRO ATOMICO BARILOCHE - ARGENTINA J.R. Granada, F. Cantargi, S. Petriw, J. Dawidowski Centro Atómico Bariloche Comisión Nacional de Energía Atómica & CONICET ARGENTINA

CENTRO ATOMICO BARILOCHE - ARGENTINA NyR - SOME RESEARCH ACTIVITIES Total Cross Section Measurement and Calculation (subthermal to epithermal range) [+T] Neutron Diffraction [+T] Deep Inelastic Neutron Scattering [+T] Non Destructive Hydrogen Content Determination Scattering Kernels for Hydrogeneous Materials

CENTRO ATOMICO BARILOCHE - ARGENTINA Scattering Kernels for Hydrogeneous Materials Previous Related Experience: THE SYNTHETIC SCATTERING FUNCTION [J.R. Granada, Phys.Rev. B 31, 4167 (1985)]

ANGULAR DISTRIBUTIONS Experiment performed at the Orphee reactor (λ= Ả) TOTAL CROSS SECTIONS Light water and plexiglass at room temperature

DIFFUSION PARAMETERS Pulse decay time for a traditional “Hokkaido configuration” DIFFUSION PARAMETERS Decay constant of heavy water at room temperature J.Nucl.Mat. 139, 158 (1986)

Multiple scattering corrections to the observed spectra (MARI experiment) Phys.Rev. B 58, 706 (1998)

CENTRO ATOMICO BARILOCHE - ARGENTINA

SYNTHETIC SCATTERING KERNELS Phys.Rev. B 31, 4167 (1985) CENTRO ATOMICO BARILOCHE - ARGENTINA

Cross sections calculated through ‘synthetic model’ compared with exp. data at different temperatures Cryogenic Moderators

CENTRO ATOMICO BARILOCHE - ARGENTINA Development of New Cold Neutron Moderators (Main objective of the ACoM collaboration) SCATTERING KERNELS FOR ADVANCED MODERATOR MATERIALS

CENTRO ATOMICO BARILOCHE - ARGENTINA NJOY Calculations Synthetic Frequency Spectrum Combination of experimental and synthetic contributions  Continuous part associated to traslational and rotational motions of the molecular system  Vibrational modes (discretes)

NJOY (library ENDF)  scattering mass Scattering proc SFS Gaussian approx. 100 phonons S(Q  ) [SFS] LEAPR S(Q  ) [SFS]  (E) kernels [SFS] integrals library ACE [SFS] THERMRACER

Solid Methane: applications of the SFS concept

Solid Methane: using SFS Neutron spectra at different temps calculated with MCNP using SFS´based libraries. Neutron spectra at different temps calculated with MCNP using SFS´based libraries.

Light Water Ice Cross Sections obtained from SFS

Clathrate Neutron X-sections and spectra calculated with the use of a Synth. Frequency Spectrum

Clathrate Clathrate, Methane and Ice at 20K

Cross sections calculated through ‘synthetic model’ compared with exp. data at different temperatures Cryogenic Moderators

Neutron spectra from moderator substances at different temperatures (calculated) Cryogenic Moderators

Calculated spectra of typical cryogenic moderators for the “Hokkaido Configuration”

CENTRO ATOMICO BARILOCHE - ARGENTINA SCATTERING KERNELS FOR ADVANCED MODERATOR MATERIALS Latest Development of New Cold Neutron Moderators

CENTRO ATOMICO BARILOCHE - ARGENTINA Neutron Scattering Kernel for Solid Methane in phase II Rolando Granada Centro Atomico Bariloche ARGENTINA

CENTRO ATOMICO BARILOCHE - ARGENTINA

The scattering law of a molecular system R lν (t) denotes the position of the atom v within the molecule l, can be written as the sum of inter (l  l´)- and intra (l  l´)- molecular contributions (also referred to as the outer and inner terms, respectively). The intermediate scattering function is

CENTRO ATOMICO BARILOCHE - ARGENTINA Carbon selfHydrogen self Interference caused by Proton spin correlations g Г = 1 for disordered molecules = 3 for ordered molecules

CENTRO ATOMICO BARILOCHE - ARGENTINA Calculated components of σ T (E) for CH 4 II at 4K CH 4 II

CENTRO ATOMICO BARILOCHE - ARGENTINA Comparison of calculated σ T (E) with experimental data of Grieger et al. J.Chem.Phys.109,3161 (1998) CH 4 II

CENTRO ATOMICO BARILOCHE - ARGENTINA Temperature dependence of σ T at low energies caused by spin correlations Open circles: this work Closed circl.: Grieger exper. Lines: Ozaki calculations CH 4 II

CENTRO ATOMICO BARILOCHE - ARGENTINA

Neutron Cross Section Libraries for Aromatic Systems of interest as Cold Neutron Moderators F. Cantargi, J.R. Granada, L.A. Rodríguez Palomino, S. Petriw, M.M. Sbaffoni Centro Atomico Bariloche ARGENTINA

CENTRO ATOMICO BARILOCHE - ARGENTINA Good moderator for a cold neutron source  good resistance to radiation (S.Kulikov, E. Shabalin, V. Melikhov, E. Kulagin, Proceedings of the ICANS-XVI Meeting, Neuss, Germany, 2003)  high protonic density  low-energy excitations (I. Natkaniec, Proceedings of the ACoM6 Meeting, ESS-FZ Julich, 2002)  easy handling MESITYLENE

CENTRO ATOMICO BARILOCHE - ARGENTINA Low energy part of our adopted SFS

CENTRO ATOMICO BARILOCHE - ARGENTINA (Phase III) Experiments using the Bariloche LINAC

CENTRO ATOMICO BARILOCHE - ARGENTINA Experiments using the Bariloche LINAC

CENTRO ATOMICO BARILOCHE - ARGENTINA Calculated Spectra for the Methyl derivatives of Benzene

CENTRO ATOMICO BARILOCHE - ARGENTINA Comparison of Mesitylene and Mixture with standard moderators

CENTRO ATOMICO BARILOCHE - ARGENTINA Thank you!

CENTRO ATOMICO BARILOCHE - ARGENTINA

25 MeV e-LINAC

73 cm total height; 50 cm diameter; 38 cm moderator height. Stainless steel. Zircaloy-4 windows Cryogenic Moderators

Cryo-Moderator contained in succession of zircalloy-4 containers Cryogenic Moderators

CENTRO ATOMICO BARILOCHE - ARGENTINA