Progress of IRSN on Nuclear Data Assessment for Molybdenum
Explore the progress made by IRSN on nuclear data assessment for Molybdenum through working package WP2 & 4. The assessment focuses on producing Mo evaluation with covariance for RP and cross sections using various sources like JEFF-33, ENDF/B-VIII.0, and JENDL-4.0. The project involves fitting experimental data with SAMMY code, generating covariance matrices, and planning new differential measurements for 95Mo. The endeavor aims to enhance the understanding of nuclear data critical for various experiments sensitive to Mo capture.
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Presentation Transcript
SANDA GENERAL MEETING PROGRESS OF IRSN ON WP2&4 WORK PACKAGE 7-11 MARCH 2022 IRSN PSN-RES/SNC/LN P le S ret Nucl aire Service de Neutronique et des risques de Criticit Laboratoire de Neutronique N. LECLAIRE L. LEAL IRSN/FRM-296 ind. 06
Working package WP2 & 4 Measurement and assessment of nuclear data [ ASSESSMENT OF MOLYBDENUM NUCLEAR DATA Target: produce Mo evaluation with covariance for RP and cross sections JEFF-33, ENDF/B-VIII.0: covariance for cross sections BUT no covariance for RP JENDL-4.0: no covariance for RP and cross sections Resonance parameters retrieved from JEFF-3.1.1, JEFF-3.3, JENDL-4.0, ENDF/B-VII.1 and ENDF/B-VIII.0 evaluations Identification of available differential measurements in EXFOR Lack of data for 95Mo Use of JENDL-4.0 resonance parameters to initiate the evaluation process Correspondence between spin groups and channel spins addressed Transmission and capture measurements of natMo at J-PARC (Japan) on various samples ANNRI experimental device 0.1, 0.5, 2 mm thick for capture and 0.5, 5 mm thick for transmission SANDA GENERAL MEETING 9-11 FEBRUARY 2021 2
Working package WP2 & 4 Measurement and assessment of nuclear data [ ASSESSMENT OF MOLYBDENUM NUCLEAR DATA Fit of experimental data with SAMMY code (R-matrix) Preliminary evaluation: sequential fit Resolved resonance description Use of 2 as figure of merit Generation of covariance matrix Updated RP and RP covariance data at each step Use of 0.5 mm sample in 0-600 eV Low data resolution above 350 eV Need of enriched samples SANDA-ARIEL ANNUAL MEETING MARCH 7-11 2022 3
Working package WP2 & 4 Measurement and assessment of nuclear data [ NEW DIFFERENTIAL MEASUREMENTS 95Mo (RRR): Collaboration with LANL: RRR extended to 8 keV Transmission and capture data for 95Mo Benchmark testing on MIRTE experiments with Mo screen, future validation on experiment realized at SNL when available n_TOF and GELINA measurements of enriched Mo are planned Additional data: RPI transmission data for isotopes (95Mo, 96Mo, 98Mo, 100Mo) are planned SANDA-ARIEL ANNUAL MEETING MARCH 7-11 2022 4
Working package WP2 & 4 Measurement and assessment of nuclear data [ KEFF RESULTS WITH EXISTING LIBRARIES FOR EXPERIMENTS SENSITIVE TO 95MO CAPTURE Calculation of experiments sensitive to 95Mo capture in thermal energy range MIRTE: LCT-106 in ICSBEP Handbook Cross-shaped screen of Mo (10 mm thick) New experiment at SNL programmed FY2022 and designed to be more sensitive than MIRTE exp Sleeves surrounding 7uPCX rods JEFF-33 + new Mo -Benchmark (pcm) JEFF-33 - Benchmark (pcm) Integral sensitivity EALF (eV) Benchmark keff Uncertainty (pcm) New experiment at SNL 0.09 1.00000 Unkown -122 521 -0.085 heu-comp-inter-005.c03 6670 1.03000 600 1362 1694 N.A. MIRTE (LCT-106) 0.13 1.00080 123 -187 25 -0.037 SANDA-ARIEL ANNUAL MEETING MARCH 7-11 2022 5
Working package WP2 & 4 Measurement and assessment of nuclear data [ INTEGRAL EXPERIMENTS PLANNED AT SNL ON SPRF/CX Test zone with Mo sleeves Mo sleeves Experiment with 7uPCX rods surrounded by natural molybdenum sleeves in a test zone at the center of assembly 7uPCX rods without sleeves around test zone Sensitivity to 95Mo capture in thermal energy range Reference experiments without sleeves are planned as well as reproducibility experiments Sleeves were manufactured and sent to SNL Measurements of diameters ad chemical composition Experiments are planned FY2022 SANDA-ARIEL ANNUAL MEETING MARCH 7-11 2022 6
Working package WP2 & 4 Measurement and assessment of nuclear data Resonance Integral (barns) [ DIFFERENTIAL DATA NEEDS Thermal Cross Section (barns) Isotope Composition (%) 92Mo 14.84 0.08 0.02 0.83 Enriched sample needed 94Mo 9.25 0.34 0.02 1.12 Experimental data for natural Mo 95Mo 15.92 13.4 0.3 118.7 7 96Mo 16.68 0.5 0.3 17 3 Experimental data for 95Mo. Highest thermal cross section and resonance integral 97Mo 9.55 2.2 0.2 14.4 3.0 98Mo 24.13 0.130 0.006 6.7 0.3 Experimental data for 96Mo and 97Mo 100Mo 9.63 0.199 0.002 3.76 0.15 Experimental data for the remaining isotopes will be very useful in the evaluation process SANDA-ARIEL ANNUAL MEETING MARCH 7-11 2022 7
