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Consistency of Existing Decay Data Bases
V. Chechev,S. Badikov,T. Golashvili,Huang Xiaolong,Ge Zhigang,Wu Zhendong 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Consistency of the widely used decay data bases (ENSDF, NUBASE, NWC (Nuclear Wallet Cards), DDEP (Decay Data Evaluation Project) ) were analyzed within the framework of joint Chinese-Russian research project. Two decay characteristics (the half-life and the average energies of radiation) - were considered.The evaluated half-life data for nuclides important for applications is consistent within declared uncertainties. The only deficiency is an absence of generally accepted procedure for evaluation of the half-life values and their uncertainties on the basis of the discrepant experimental data. As a result some agreements (like the 0.1% rule) are used for correction of calculated uncertainties of the half-life evaluations. To justify and check the half-life evaluated data a new statistical procedure taking unrecognized experimental errors into account was developed. The procedure was applied for processing discrepant experimental data. The results of the calculations are compared to the ENSDF and DDEP evaluations. Applying new procedure results in more realistic uncertainties of the half-life evaluations. There are essential inconsistencies between the ENSDF, NUBASE and NWC evaluations for short-lived nuclides. A list of nuclides with the largest discrepancies was compiled and presented. For resolving the inconsistencies new measurements must be carried out.The average energies of radiation for nuclides important for applications were calculated. There exists a good agreement between the calculated values and the ENDF/B-VII (converted from the ENSDF) and JEFF-3.1 evaluations. In both the libraries the discrete gamma-ray spectra are presented as a set of the gamma-ray energies and absolute intensities. It was emphasized that the calculation of the average gamma-ray energy on the basis of this information results in systematical underestimating the uncertainty of the energy compared to a value calculated with using relative intensities. This effect is similar to so called Peelle's Pertinent Puzzle.
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New IAEA Actinide Decay Data Library
M. A. Kellett,M-M. Be,V. Chechev,Xiaolong Huang,F. G. Kondev,A. Luca,G. Mukherjee,A. L. Nichols,A. Pearce 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A recently completed IAEA Coordinated Research Project (CRP) entitled ``Updated Decay Data Library for Actinides'' has resulted in new and comprehensive evaluations of the decay scheme data for over forty nuclear-power related actinides, along with a further forty radionuclides that arise from their natural decay. A number of data inadequacies remain despite a series of well-defined measurements being undertaken under the auspices of this CRP, which were subsequently incorporated into the relevant evaluations. A list is given of these outstanding measurement requirements as identified from observed shortcomings in the available data. The final data library is available in two standard formats: ENSDF for use in nuclear structure studies, and ENDF for nuclear plant applications including design and operation. Evaluations were undertaken by following the precise methodology of the Decay Data Evaluation Project (DDEP) to ensure that a uniform approach was applied by all participants. The library and associated documentation are available from a dedicated IAEA webpage (http://www-nds.iaea.org/act\textunderscore ddl/).
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Nuclide Guide and International Chart of the Nuclides - 2009
Tengiz Golashvili,Sergey Badikov,Zhao Zhixiang,Huang Xiaolong,Ge Zhigang,Wu Zhendong,Valery Chechev 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
New versions of Nuclide Guide (NG) and Chart of the Nuclides (CN) were developed as a result of Russian-Chinese collaboration. Compared to the previous versions of the NG and CN - 2006 new evaluated information has been included to the NG and CN - 2009 from the following publications: 1) Nuclear Data Sheets, volumes 107 - 110, 2) Monographie BIPM-5, Table of Radionuclides, 2006, 3) Monographie BIPM-5, Table of Radionuclides, 2008. In addition, for the Nuclide Guide-2009 the authors re-calculated the average energies of radiations of the 500 radionuclides with half-lives about and more than 1 hour. The International Chart of Nuclides was developed taking into account information added and revised in Nuclide Guide-2009. The presented decay data can be used not only in nuclear physics and associated fields but also in medicine, agriculture and space studies.
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