CENTRO ATOMICO BARILOCHE ARGENTINA MODELING AND MEASUREMENTS OF
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](https://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-1.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![MODELING AND MEASUREMENTS OF NEUTRONIC PROPERTIES OF NEW CRYOGENIC NEUTRON MODERATORS J. R. Granada, MODELING AND MEASUREMENTS OF NEUTRONIC PROPERTIES OF NEW CRYOGENIC NEUTRON MODERATORS J. R. Granada,](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-2.jpg)
MODELING AND MEASUREMENTS OF NEUTRONIC PROPERTIES OF NEW CRYOGENIC NEUTRON MODERATORS J. R. Granada, F. Cantargi, S. Petriw, J. Dawidowski Centro Atómico Bariloche Comisión Nacional de Energía Atómica & CONICET ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA
![Ny. R - SOME RESEARCH ACTIVITIES Total Cross Section Measurement and Calculation (subthermal to Ny. R - SOME RESEARCH ACTIVITIES Total Cross Section Measurement and Calculation (subthermal to](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-3.jpg)
Ny. R - 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. Scattering Kernels for Hydrogeneous Materials Previous Related Experience: THE SYNTHETIC SCATTERING FUNCTION [J. R.](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-4.jpg)
Scattering Kernels for Hydrogeneous Materials Previous Related Experience: THE SYNTHETIC SCATTERING FUNCTION [J. R. Granada, Phys. Rev. B 31, 4167 (1985)] CENTRO ATOMICO BARILOCHE - ARGENTINA
![TOTAL CROSS SECTIONS Light water and plexiglass at room temperature ANGULAR DISTRIBUTIONS Experiment performed TOTAL CROSS SECTIONS Light water and plexiglass at room temperature ANGULAR DISTRIBUTIONS Experiment performed](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-5.jpg)
TOTAL CROSS SECTIONS Light water and plexiglass at room temperature ANGULAR DISTRIBUTIONS Experiment performed at the Orphee reactor (λ=0. 7045 Ả)
![DIFFUSION PARAMETERS Pulse decay time for a traditional “Hokkaido configuration” DIFFUSION PARAMETERS Decay constant DIFFUSION PARAMETERS Pulse decay time for a traditional “Hokkaido configuration” DIFFUSION PARAMETERS Decay constant](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-6.jpg)
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 Multiple scattering corrections to the observed spectra (MARI experiment) Phys. Rev. B 58, 706](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-7.jpg)
Multiple scattering corrections to the observed spectra (MARI experiment) Phys. Rev. B 58, 706 (1998)
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-8.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![SYNTHETIC SCATTERING KERNELS Phys. Rev. B 31, 4167 (1985) CENTRO ATOMICO BARILOCHE - ARGENTINA SYNTHETIC SCATTERING KERNELS Phys. Rev. B 31, 4167 (1985) CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-9.jpg)
SYNTHETIC SCATTERING KERNELS Phys. Rev. B 31, 4167 (1985) CENTRO ATOMICO BARILOCHE - ARGENTINA
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-10.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![Cryogenic Moderators Cross sections calculated through ‘synthetic model’ compared with exp. data at different Cryogenic Moderators Cross sections calculated through ‘synthetic model’ compared with exp. data at different](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-11.jpg)
Cryogenic Moderators Cross sections calculated through ‘synthetic model’ compared with exp. data at different temperatures
![Development of New Cold Neutron Moderators (Main objective of the ACo. M collaboration) SCATTERING Development of New Cold Neutron Moderators (Main objective of the ACo. M collaboration) SCATTERING](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-12.jpg)
Development of New Cold Neutron Moderators (Main objective of the ACo. M 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 NJOY Calculations Synthetic Frequency Spectrum Combination of experimental and synthetic contributions Continuous part associated](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-13.jpg)
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) CENTRO ATOMICO BARILOCHE - ARGENTINA
![NJOY • (library ENDF) • s scattering • mass • Scattering proc • SFS NJOY • (library ENDF) • s scattering • mass • Scattering proc • SFS](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-14.jpg)
NJOY • (library ENDF) • s scattering • mass • Scattering proc • SFS Gaussian approx. 100 phonons S(Q, w) [SFS] LEAPR S(Q, w) [SFS] integrals THERMR s(E) kernels [SFS] library ACE [SFS] ACER
![Solid Methane: applications of the SFS concept Solid Methane: applications of the SFS concept](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-15.jpg)
Solid Methane: applications of the SFS concept
![Solid Methane: using SFS Neutron spectra at different temps calculated with MCNP using SFS´based Solid Methane: using SFS Neutron spectra at different temps calculated with MCNP using SFS´based](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-16.jpg)
Solid Methane: using SFS Neutron spectra at different temps calculated with MCNP using SFS´based libraries.
![Light Water Ice Cross Sections obtained from SFS Light Water Ice Cross Sections obtained from SFS](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-17.jpg)
Light Water Ice Cross Sections obtained from SFS
![Clathrate Neutron X-sections and spectra calculated with the use of a Synth. Frequency Spectrum Clathrate Neutron X-sections and spectra calculated with the use of a Synth. Frequency Spectrum](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-18.jpg)
Clathrate Neutron X-sections and spectra calculated with the use of a Synth. Frequency Spectrum
![Clathrate, Methane and Ice at 20 K Clathrate, Methane and Ice at 20 K](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-19.jpg)
Clathrate, Methane and Ice at 20 K
![Cryogenic Moderators Cross sections calculated through ‘synthetic model’ compared with exp. data at different Cryogenic Moderators Cross sections calculated through ‘synthetic model’ compared with exp. data at different](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-20.jpg)
Cryogenic Moderators 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 Neutron spectra from moderator substances at different temperatures (calculated)](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-21.jpg)
Cryogenic Moderators Neutron spectra from moderator substances at different temperatures (calculated)
![Calculated spectra of typical cryogenic moderators for the “Hokkaido Configuration” Calculated spectra of typical cryogenic moderators for the “Hokkaido Configuration”](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-22.jpg)
Calculated spectra of typical cryogenic moderators for the “Hokkaido Configuration”
![SCATTERING KERNELS FOR ADVANCED MODERATOR MATERIALS Latest Development of New Cold Neutron Moderators CENTRO SCATTERING KERNELS FOR ADVANCED MODERATOR MATERIALS Latest Development of New Cold Neutron Moderators CENTRO](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-23.jpg)
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 Neutron Scattering Kernel for Solid Methane in phase II Rolando Granada Centro Atomico Bariloche](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-24.jpg)
Neutron Scattering Kernel for Solid Methane in phase II Rolando Granada Centro Atomico Bariloche ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-25.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![The scattering law of a molecular system R lν(t) denotes the position of the The scattering law of a molecular system R lν(t) denotes the position of the](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-26.jpg)
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 self Hydrogen self Interference caused by Proton spin correlations g. Г = 1 Carbon self Hydrogen self Interference caused by Proton spin correlations g. Г = 1](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-27.jpg)
Carbon self Hydrogen self Interference caused by Proton spin correlations g. Г = 1 for disordered molecules = 3 for ordered molecules CENTRO ATOMICO BARILOCHE - ARGENTINA
![CH 4 II Calculated components of σT(E) for CH 4 II at 4 K CH 4 II Calculated components of σT(E) for CH 4 II at 4 K](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-28.jpg)
CH 4 II Calculated components of σT(E) for CH 4 II at 4 K CENTRO ATOMICO BARILOCHE - ARGENTINA
![CH 4 II Comparison of calculated σT(E) with experimental data of Grieger et al. CH 4 II Comparison of calculated σT(E) with experimental data of Grieger et al.](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-29.jpg)
CH 4 II Comparison of calculated σT(E) with experimental data of Grieger et al. J. Chem. Phys. 109, 3161 (1998) CENTRO ATOMICO BARILOCHE - ARGENTINA
![CH 4 II Temperature dependence of σT at low energies caused by spin correlations CH 4 II Temperature dependence of σT at low energies caused by spin correlations](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-30.jpg)
CH 4 II Temperature dependence of σT at low energies caused by spin correlations Open circles: this work Closed circl. : Grieger exper. Lines: Ozaki calculations CENTRO ATOMICO BARILOCHE - ARGENTINA
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-31.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![Neutron Cross Section Libraries for Aromatic Systems of interest as Cold Neutron Moderators F. Neutron Cross Section Libraries for Aromatic Systems of interest as Cold Neutron Moderators F.](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-32.jpg)
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
![MESITYLENE • Good moderator for a cold neutron source good resistance to radiation (S. MESITYLENE • Good moderator for a cold neutron source good resistance to radiation (S.](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-33.jpg)
MESITYLENE • 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 ACo. M 6 Meeting, ESS-FZ Julich, 2002) easy handling CENTRO ATOMICO BARILOCHE - ARGENTINA
![Low energy part of our adopted SFS CENTRO ATOMICO BARILOCHE - ARGENTINA Low energy part of our adopted SFS CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-34.jpg)
Low energy part of our adopted SFS CENTRO ATOMICO BARILOCHE - ARGENTINA
![(Phase III) Experiments using the Bariloche LINAC CENTRO ATOMICO BARILOCHE - ARGENTINA (Phase III) Experiments using the Bariloche LINAC CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-35.jpg)
(Phase III) Experiments using the Bariloche LINAC CENTRO ATOMICO BARILOCHE - ARGENTINA
![Experiments using the Bariloche LINAC CENTRO ATOMICO BARILOCHE - ARGENTINA Experiments using the Bariloche LINAC CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-36.jpg)
Experiments using the Bariloche LINAC CENTRO ATOMICO BARILOCHE - ARGENTINA
![Calculated Spectra for the Methyl derivatives of Benzene CENTRO ATOMICO BARILOCHE - ARGENTINA Calculated Spectra for the Methyl derivatives of Benzene CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-37.jpg)
Calculated Spectra for the Methyl derivatives of Benzene CENTRO ATOMICO BARILOCHE - ARGENTINA
![Comparison of Mesitylene and Mixture with standard moderators CENTRO ATOMICO BARILOCHE - ARGENTINA Comparison of Mesitylene and Mixture with standard moderators CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-38.jpg)
Comparison of Mesitylene and Mixture with standard moderators CENTRO ATOMICO BARILOCHE - ARGENTINA
![Thank you! CENTRO ATOMICO BARILOCHE - ARGENTINA Thank you! CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-39.jpg)
Thank you! CENTRO ATOMICO BARILOCHE - ARGENTINA
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-40.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![25 Me. V e-LINAC 25 Me. V e-LINAC](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-41.jpg)
25 Me. V e-LINAC
![25 Me. V e-LINAC 25 Me. V e-LINAC](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-42.jpg)
25 Me. V e-LINAC
![Cryogenic Moderators 73 cm total height; 50 cm diameter; 38 cm moderator height. Stainless Cryogenic Moderators 73 cm total height; 50 cm diameter; 38 cm moderator height. Stainless](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-43.jpg)
Cryogenic Moderators 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 Cryo-Moderator contained in succession of zircalloy-4 containers](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-44.jpg)
Cryogenic Moderators Cryo-Moderator contained in succession of zircalloy-4 containers
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-45.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
![CENTRO ATOMICO BARILOCHE - ARGENTINA CENTRO ATOMICO BARILOCHE - ARGENTINA](http://slidetodoc.com/presentation_image_h2/cd0773445bb3ee40350f656c2fa5b402/image-46.jpg)
CENTRO ATOMICO BARILOCHE - ARGENTINA
- Slides: 46