https://digital.library.unt.edu/ark:/67531/metadc888955/m2/1/high_res_d/900147.pdf

ENDF/B-VII.0: Next Generation Evaluated Nuclear Data Library for Nuclear Science and Technology

Determination of Resonance Parameters and their Covariances from Neutron Induced Reaction Cross Section Data

H1 1/2+ 99.985 H2 1+ 0.015 He3 1/2+ 0.000137 He4 0+ 99.999863 Li6 1+ 7.5 Li7 3/292.5 Be9 3/2100 B10 3+ 19.9 B11 3/280.1 C12 0+ 98.90 C13 1/21.10 N14 1+ 99.634 N15 1/20.366 O16 0+ 99.762 O17 5/2+ 0.038 O18 0+ 0.200 F19 1/2+ 100 Ne20 0+ 90.48 Ne21 3/2+ 0.27 Ne22 0+ 9.25 Na23 3/2+ 100 Mg24 0+ 78.99 Mg25 5/2+ 10.00 Mg26 0+ 11.01 Al27 5/2+ 100 Si28 0+ 92.23 Si29 1/2+ 4.67 Si30 0+ 3.10 P31 1/2+ 100 S32 0+ 95.02 S33 3/2+ 0.75 S34 0+ 4.21 S36 0+ 0.02 * Cl35 3/2+ 75.77 Cl37 3/2+ 24.23 Ar36 0+ 0.337 Ar38 0+ 0.063 Ar40 0+ 99.600 * K39 3/2+ 93.2581 K40 41.277E+9 y EC,β0.0117 K41 3/2+ 6.7302 Ca40 0+ 96.941 Ca42 0+ 0.647 Ca43 7/20.135 Ca44 0+ 2.086 Ca46 0+ 0.004 Ca48 0+ 6E+18 y β-,β-β0.187 * Sc45 7/2100 Ti46 0+ 8.0 Ti47 5/27.3 Ti48 0+ 73.8 Ti49 7/25.5 Ti50 0+ 5.4 * V50 6+ 1.4E+17 y EC,β0.250 V51 7/299.750 Cr50 0+ 1.8E+17 y ECEC 4.345 Cr52 0+ 83.789 Cr53 3/29.501 Cr54 0+ 2.365 * Mn55 5/2100 * Fe54 0+ 5.8 Fe56 0+ 91.72 Fe57 1/22.2 Fe58 0+ 0.28 Co59 7/2100 Ni58 0+ 68.077 Ni60 0+ 26.223 Ni61 3/21.140 Ni62 0+ 3.634 Ni64 0+ 0.926 Cu63 3/269.17 Cu65 3/230.83 * Zn64 0+ 48.6 Zn66 0+ 27.9 Zn67 5/24.1 Zn68 0+ 18.8 Zn70 0+ 5E+14 y

核素图册 = Chart of the nuclides

Neutron capture and transmission measurements were performed by the time-of-flight technique at the Rensselaer Polytechnic Institute linac facility using metallic and liquid Gd samples. The liquid ...

/pdf/neutron-capture-and-total-cross-section-measurements-and-3xz2i9v94m.pdf

Neutron Capture and Total Cross-Section Measurements and Resonance Parameters of Gadolinium

A comprehensive set of Monte Carlo simulations was performed with the MCNP5 code to provide a generic characterisation of the neutron and photon fluxes for time-of-flight measurements at all flight paths of the GELINA facility. Simulations were performed for the direct flux configuration (DFC, 10 keV–20 MeV) and the moderated flux configuration (MFC, 10 meV–1 MeV). Fluxes and flux energy spectra were obtained for both neutrons and photons. For neutrons, additionally, detailed resolution functions and figures of merit were obtained. The validity of the approach for the photon spectra is shown by comparison with a dedicated measurement. Also, a verification is presented of the validity of the neutron resolution function by comparison with measured capture and transmission data for 103 Rh and 56 Fe in the incident neutron energy range from 70 eV to 50 keV. This comprehensive overview will facilitate the planning and analysis of measurements at the GELINA facility with an improved knowledge of its physical characteristics.

Global characterisation of the GELINA facility for high-resolution neutron time-of-flight measurements by Monte Carlo simulations

The purpose of the present work is to accurately measure the neutron cross sections of samarium. The most significant isotope is {sup 149}Sm, which has a large neutron absorption cross section at thermal energies and is a {sup 235}U fission product with a 1% yield. Its cross sections are thus of concern to reactor neutronics. Neutron capture and transmission measurements were performed by the time-of-flight technique at the Rensselaer Polytechnic institute (RPI) LINAC facility using metallic and liquid Sm samples. The capture measurements were made at the 25 meter flight station with a multiplicity-type capture detector, and the transmission total cross-section measurements were performed at 15- and 25-meter flight stations with {sup 6}Li glass scintillation detectors. Resonance parameters were determined by a combined analysis of six experiments (three capture and three transmission) using the multi-level R-matrix Bayesian code SAMMY version M2. The significant features of this work are as follows. Dilute samples of samarium nitrate in deuterated water (D{sub 2}O) were prepared to measure the strong resonances at 0.1 and 8 eV without saturation. Disk-shaped spectroscopic quartz cells were obtained with parallel inner surfaces to provide a uniform thickness of solution. The diluent feature of the SAMMY program was usedmore » to analyze these data. The SAMMY program also includes multiple scattering corrections to capture yield data and resolution functions specific to the RPI facility. Resonance parameters for all stable isotopes of samarium were deduced for all resonances up to 30 eV. Thermal capture cross-section and capture resonance integral calculations were made using the resultant resonance parameters and were compared to results obtained using resonance parameters from ENDF/B-VI updated through release 3. Extending the definition of the capture resonance integral to include the strong 0.1 eV resonance in {sup 149}Sm, present measurements agree within estimated uncertainties with EnDF/B-VI release 3. The thermal capture cross-section was calculated from the present measurements of the resonance parameters and also agrees with ENDF within estimated uncertainties. The present measurements reduce the statistical uncertainties in resonance parameters compared to prior measurements.« less

/pdf/neutron-capture-and-transmission-measurements-and-resonance-3mtaunruqy.pdf

Neutron capture and transmission measurements and resonance parameter analysis of niobium

Two new photoneutron targets have been developed for neutron time-of-flight experiments, the axial water-moderated target (AWMT) and the bare bounce target (BBT). These targets operate without any lead shielding nearby and both have superior neutron resolution compared to the older bounce target. The BBT has been selected over the AWMT for general time-of-flight measurements because it exhibited lower neutron background in the keV energy region.

Photoneutron target development for the RPI linear accelerator

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Neutron capture and transmission measurements and resonance parameter analysis of niobium

Photoneutron target development for the RPI linear accelerator