635 Matching Results

Search Results

Advanced search parameters have been applied.

Radioactive-nuclide decay data in science and technology

Description: The scope of ENDF/B has recently been expanded to include radioactive- nuclide decay data. In this paper, the content and organization of the decay data which are included in ENDF/B are presented and discussed. The application of decay data in a wide variety of nuclear-related activities is illustrated by a number of examples. Two items pointed up by the ENDF/B decay-data compilation effort are treated: the identification of deficiencies in the data; and the importance of a radioactive-nuclide metrology effort oriented toward supplying these needs in a systematic fashion. (3 figures, 1 table) (auth)
Date: January 1, 1975
Creator: Reich, C.W. & Helmer, R.G.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: APRIL 1, 2005 TO JUNE 30, 2005

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period April 1, 2005 to June 30, 2005. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: June 30, 2005
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: APRIL 1, 2006 TO JUNE 30, 2006

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period April 1, 2006 to June 30, 2006. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: June 30, 2006
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: JANUARY 1, 2005 TO DECEMBER 31, 2005

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period January 1, 2005 to December 31, 2005. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: December 31, 2005
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: JANUARY 1, 2005 TO MARCH 31, 2005

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period January 1, 2005 to March 31, 2005. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: March 31, 2005
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: JANUARY 1, 2005 TO MARCH 31, 2005

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period January 1, 2005 to March 31, 2005. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: March 31, 2006
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: JULY 1, 2005 TO SEPTEMBER 30, 2005

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period July 1, 2005 to September 30, 2005. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: September 30, 2005
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: JULY 1, 2006 TO SEPTEMBER 30, 2006

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period July 1, 2006 to September 30, 2006. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: September 30, 2006
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

RECENT REFERENCES: OCTOBER 1, 2005 TO DECEMBER 31, 2005

Description: This document lists experimental references added to Nuclear Science References (NSR) during the period October 1, 2005 to December 31, 2005. The first section lists keynumbers and keywords sorted by mass and nuclide. The second section lists all references, ordered by keynumber.
Date: December 31, 2005
Creator: WINCHELL, D.F.
Partner: UNT Libraries Government Documents Department

Measured data used in the Watusi cross-section sets

Description: In this document we list the experimental data that were used to make up the major cross- section sets that we use in the Watusi code to calculate the amount of detector activation in device tests. In order to use experimental data to make up a cross-section set, it is often necessary to extrapolate the cross sections down to either the threshold energy or to 0.01 keV, and to extrapolate up to 20 MeV. We then fit the data to a function so that we can get a smoothed set of interpolated values at up to 321 energy points. The combined data are then processed with the Hiroshima code into flux-weighted, group-averaged cross sections for use with the output from the different physics design codes. We typically use the standard 53 or 175 energy group structures. In a recent companion memo 1 we described the make up of all of the cross-section sets in detail, giving references to both the experimental data and the theoretical calculations that were used. The following sections have the experimental data, in the form of energy-cross section pairs, for the titanium, chromium, bromine, krypton, yttrium, zirconium, iodine, europium, lutetium, and bismuth sets. The other cross-section sets are not directly based on enough experimental data to warrant their listing here. Many of the reactions used in these sets are based on calculated cross sections. In making these calculations certain parameters are sometimes adjusted so that the calculated cross sections match experimental data. In some of these cases we have made a further normalization to give a closer agreement to selected experimental data, and such normalizations are noted in this document. In other cases no further normalization was made. In Table 1 we summarize the reactions for which we present the experimental data given in Tables 2-46. ...
Date: February 9, 1999
Creator: Mustafa, M & Nethaway, D R
Partner: UNT Libraries Government Documents Department

A temperature dependent ENDF/B-VI, release 4: Cross Section Library

Description: The ENDF/B data library has recently been updated and is now available through the National Nuclear Data Center (NNDC), Brookhaven National Laboratory. This most recent library is identified as ENDF/B- VI, Release 4. This release completely supersedes the preceding release, Release 3, distributed in January 1996. As distributed the ENDF/B-VI, Release 4 data includes cross sections represented in the form of a combination of resonance parameters and/or tabulated energy dependent cross sections, nominally at 0 Kelvin temperature. For use in applications this library has been processed into the form of temperature dependent cross sections at eight temperatures between 0 and 2100 Kelvin, in steps of 300 Kelvin. At each temperature the cross sections are tabulated and linearly interpolable in energy. The all results are in the computer independent ENDF/B-VI character format, which allows the data to be easily transported between 2 computers. It is approximately 1 gigabyte in size and is distributed on two CDs.
Date: June 1, 1997
Creator: Cullen, D. E.
Partner: UNT Libraries Government Documents Department

Activities at Los Alamos for the optical model segment of the RIPL CRP

Description: This report discusses activity at Los Alamos on the nuclear optical model. In particular, the following topics are discussed: format of the optical model parameter library; contents of the library; validation of the optical model library; and conclusions and recommendations.
Date: May 10, 1997
Creator: Young, P. G.
Partner: UNT Libraries Government Documents Department

INTERNATIONAL CO-OPERATION IN NUCLEAR DATA EVALUATION

Description: The OECD Nuclear Energy Agency (NEA) is organising a co-operation between the major nuclear data evaluation projects in the world. The co-operation involves the ENDF, JEFF, and JENDL projects, and, owing to the collaboration with the International Atomic Energy Agency (IAEA), also the Russian RUSFOND and the Chinese CENDL projects. The Working Party on international nuclear data Evaluation Cooperation (WPEC), comprised of about 20 core members, manages this co-operation and meets annually to discuss progress in each evaluation project and also related experimental activities. The WPEC assesses common needs for nuclear data improvements and these needs are then addressed by initiating joint evaluation efforts. The work is performed in specially established subgroups, consisting of experts from the participating evaluation projects. The outcome of these subgroups is published in reports, issued by the NEA. Current WPEC activities comprise for example a number of studies related to nuclear data uncertainties, including a review of methods for the combined use of integral experiments and covariance data, as well as evaluations of some of the major actinides, such as {sup 235}U and {sup 239}Pu. This paper gives an overview of current and planned activities within the WPEC.
Date: April 30, 2010
Creator: Herman, M.; Katakura,J.; Koning,A. & Nordborg,C.
Partner: UNT Libraries Government Documents Department

Alternative Approach to Nuclear Data Representation: Building the infrastructure to support QMU and next-generation simulations

Description: The nuclear data infrastructure currently relies on punch-card era formats designed some five decades ago. Though this system has worked well, recent interest in non-traditional and complicated physics processes has demanded a change. Here we present an alternative approach under development at LLNL. In this approach data is described through collections of distinct and self-contained simple data structures. This structure-based format is compared with traditional ENDF and ENDL, which can roughly be characterized as dictionary-based representations.
Date: January 17, 2006
Creator: Pruet, J; Brown, D A; Beck, B & McNabb, D P
Partner: UNT Libraries Government Documents Department

Sorting out Q values, threshold energies and level excitations in ENDL and ENDF

Description: While attempting to convert data to/from ENDF and ENDL, I discovered inconsistencies in the treatment of Q values in ENDF. These are my notes documenting these inconsistencies. The most interesting section is the last section where I compare Q values in JENDL-3.3 and ENDF/B-VII{beta}1 for various Americium isotopes.
Date: November 2, 2005
Creator: Brown, D A
Partner: UNT Libraries Government Documents Department

Status of Current Plutonium Evaluations And an Update Plan for ENDL99

Description: We review the current state of ENDL99, ENDF/B-VI.r8, JENDL-3.3, JEFF-3.0 and ENDF/B-VII.{beta}0 plutonium evaluations and lay out a tentative plan for updating all of the ENDL99 plutonium evaluations. In some specific cases, an evaluation for a particular isotope is of sufficient quality for us to adopt in ENDL99. More often, the quality of all evaluations for an isotope are low enough that we will need to perform a new evaluation.
Date: April 29, 2005
Creator: Brown, D A
Partner: UNT Libraries Government Documents Department

POINT 2012: ENDF/B-VII.1 Final Temperature Dependent Cross Section Library

Description: This report is one in the series of 'POINT' reports that over the years have presented temperature dependent cross sections for the then current version of ENDF/B [R1]. In each case I have used my personal computer at home and publicly available data and codes: (1) publicly available nuclear data (the current ENDF/B data, available on-line at the National Nuclear Data Center, Brookhaven National Laboratory, http://www.nndc.bnl.gov/) and, (2) publicly available computer codes (the current PREPRO codes, available on-line at the Nuclear Data Section, IAEA, Vienna, Austria, http://www-nds.iaea.or.at/ndspub/endf/prepro/) and, (3) My own personal computer located in my home. I have used these in combination to produce the temperature dependent cross sections used in applications and described in this report. I should mention that today anyone with a personal computer can produce these results: by its very nature I consider this data to be born in the public domain.
Date: February 26, 2012
Creator: Cullen, D E
Partner: UNT Libraries Government Documents Department

Analysis of Godiva-IV delayed-critical and static super-prompt-critical conditions

Description: Super-prompt-critical burst experiments were conducted on the Godiva-IV assembly at Los Alamos National Laboratory from the 1960s through 2005. Detailed and simplified benchmark models have been constructed for four delayed-critical experiments and for the static phase of a super-prompt-critical burst experiment. In addition, a two-dimensional cylindrical model has been developed for the super-prompt-critical condition. Criticality calculations have been performed for all of those models with four modern nuclear data libraries: ENDFIB-VI, ENDF/8-VII.0, JEFF-3.1 , and JENDL-3.3. Overall, JENDL-3.3 produces the best agreement with the reference values for k{sub eff}.
Date: January 1, 2009
Creator: Mosteller, Russell D & Goda, Joetta M
Partner: UNT Libraries Government Documents Department

Integrated system for production of neutronics and photonics calculational constants. Volume 11. Experimental data, indexes, and techniques of obtaining a selected set of neutron resonance parameters

Description: A tabulation is presented of 52,000 experimental resonance parameters, together with appropriate indexes and bibliographic citations. These materials were contained in the LLL Experimental Neutron Cross Section Library as of May 1, 1972. Techniques used to obtain a selected set of resolved and unresolved resonance parameters from the compilation are described. (auth)
Date: May 1, 1972
Creator: Gyulassy, M.; Howerton, R.J. & Perkins, S.T.
Partner: UNT Libraries Government Documents Department

Evaluated decay data for {sup 246}Cm.

Description: The Nuclear Data and Measurement Series document results of studies in the field of microscopic nuclear data. The primary objective is the dissemination of information in the comprehensive form required for nuclear technology applications. This Series is devoted to: (a) measured microscopic nuclear parameters, (b) experimental techniques and facilities employed in measurements, (c) the analysis, correlation and interpretation of nuclear data, and (d) the compilation and evaluation of nuclear data. Contributions to this Series are reviewed to assure technical competence and, unless otherwise stated, the contents can be formally referenced. This Series does not supplant formal journal publication, but it does provide the more extensive information required for technological applications (e.g., tabulated numerical data) in a timely manner.
Date: February 26, 2007
Creator: Kondev, F. G.
Partner: UNT Libraries Government Documents Department