[en] A coupled-channel formalism based on the soft-rotator model is proposed which allows conservation of the nuclear volume for dynamically deformable nuclei. The extra coupling term due to the volume conservation contributes to a stronger coupling between levels of same spin and parity. The effect is demonstrated for the case of n + ¹²C interaction leading to the 0⁺₂ state located at 7.65 MeV for incident neutron energies of 20 to 40 MeV

[en] Full text: The JENDL-4.0 was released in March 2010. It provides neutron nuclear data for 79 actinides from Ac to Fm. All of the actinides include covariance data. The covariance data were evaluated for reaction cross sections, resonance parameters, angular distributions of elastic scattering, average number of neutrons per fission, and prompt fission neutron spectra. They were deduced basically based on the consistent methodologies with the nuclear data evaluations. Statistical processing of experimental data sometimes gives unacceptably small uncertainty compared with experimental data. They may arise from ignoring unknown errors and correlation of experimental data and also from the modeling errors. The covariance data obtained from statistical estimation using the least-squares method were sometimes modified to be reasonable taking account of consistency with dispersion of experimental data, which may reflect the uncertainties of the data. For the fast neutron fission cross sections of 6 major actinides of ^233,235,238U and ^239,240,241Pu were evaluated simultaneously using both cross section and their ratio data with the least- squares fitting code SOK. It gave the covariance matrices that have cross correlations between different nuclei included in the analyses. For the minor actinide, the least-squares fitting code GMA was used for fission cross section evaluation for fast neutrons. The covariance data were obtained from the calculations at the same time. For other reaction cross sections, covariance matrices were evaluated using CCONE-KALMAN code system. Sensitivities to model parameters were calculated by CCONE code and used to estimate covariance matrices of the parameters with KALMAN code. Covariance matrices for other data such as resonance parameters and average numbers of fission neutrons were also evaluated based on experimental data. The evaluated covariance data were compiled to the ENDF-6 format files and included in JENDL-4.

[en] A new program of coupled-channels optical model calculation has been developed for the evaluation of actinide nuclei. The code is composed of by the modules having high independency and large flexibility. The code is written by C++ language using object oriented techniques. The program has capability of fitting of the parameters even for the several nuclei at the same time. The formulae required in the calculation, details of the numerical treatments and the input parameters are described. The examples of the input file and the output are also shown. (author)

No abstract available

[en] Cross sections and energy-angular distributions of emitted neutrons were evaluated for the neuron-incident reactions on ²³⁶Pu in the incident energy range of 10 eV to 20 MeV by using a statistical model combined with a coupled channel optical model. The calculated results were compiled to the latest evaluated nuclear data library JENDL-3.3 in the ENDF-6 format. The unresolved resonance region is assumed to be from 10 eV to 30 keV, and the averaged resonance parameters were obtained to reproduce the calculated cross sections. Maxwell temperature for fission neutron spectra were estimated from a systematics with a correction for prefission neutrons. (author)

[en] The purpose of the event is to assess the actual capabilities, successfully deployed methods, tools and protocols, future needs in terms of model code output and application nuclear data form structure with the aim of testing/prototyping/developing and deploying cutting-edge nuclear data form structure to support high-fidelity Multiphysics simulation efforts. A partnership between fundamental sciences and applications, along the lines of PREPRO, CRECTJ6, FUDGE, TAGNDS, TARES, DeCE, TEFAL, GIDI, MCGIDI. (author)

[en] The formation of fine vanadium nitride powders by a vapor phase reaction of VCl₄-NH₃-H₂-N₂ system was investigated between 700⁰C and 1200⁰C with emphasis on the effects of reaction conditions on the particle size and chemical composition. Oxidation resistance and thermal stability of vanadium nitride powders were also examined. The reaction was performed by two methods concerning the mixing of reactant gases; (A) low temperature mixing (400--640⁰C) and (B) high temperature mixing (700--1100⁰C). The mean particle size and surface area of vanadium nitride powder prepared by method (A) were around 500 A and about 10 m²/g, respectively. Those values of vanadium nitride powder prepared by method (B) were around 100 A and about 70 m²/g, respectively. These vanadium nitrides showed a wide range of nonstoichiometry; atomic ratio N/V=0.96--1.64 (A) and N/V=1.55--1.87 (B). X-ray diffraction patterns showed that all nitride samples had NaCl-structure. The atomic ratio N/V decreased with the increase of reaction temperature or VCl₄ or H₂ concentration, and increased with the elevation of NH₃ concentration. The lattice parameter decreased with the increase of N/V ratio. Density measurements showed that vanadium nitrides obtained had V vacancies. The oxidation of vanadium nitride powders began at about 200⁰C in air. The nitride powders with atomic ratio N/V>1 began to decompose at about 600⁰C under vacuum. On the basis of these results, the formation process of vanadium nitride particles was discussed. (auth.)

No abstract available

[en] The fission and capture cross sections of minor actinides given in JENDL-3.3 are compared with other evaluated data and experimental data. The comparison was made for 32 nuclides of Th-227, 228, 229, 230, 233, 234, Pa-231, 232, 233, U-232, 234, 236, 237, Np-236, 237, 238, Pu-236, 237, 238, 242, 244, Am-241, 242, 242m, 243, Cm-242, 243, 244, 245, 246, 247 and 248. Given in the present report are figures of these cross sections and tables of cross sections at 0.0253 eV and resonance integrals. (author)

[en] This report is a supplement to JAERI-Data/Code 98-019, describing new options of soft-rotator CC code OPTMAN installed on computers at JAERI Nuclear Data Center. Due to the new options, the code is now applicable for analysis of neutron and proton induced reactions simultaneously up to projectile energy of around 200 MeV. (author)