NJOY 99/2001: new capabilities in data processing

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The NJOY Nuclear Data Processing System is used all over the world to process evaluated nuclear data in the ENDF format into libraries for applications. Over the last few years, a number of new capabilities have been added to the system to provide advanced features for MCNP, MCNPX, and other applications codes. These include probability tables for unresolved range self shielding, capabilities optimized for high-energy libraries (typically to 150 MeV for accelerator applications), options for detailed treatments of incident and outgoing charged particles, and a capability to handle photonuclear reactions. These new features and recent experience using NJOY99 for library ... continued below

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4 p.

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MacFarlane, R. E. (Robert E.) January 1, 2002.

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Description

The NJOY Nuclear Data Processing System is used all over the world to process evaluated nuclear data in the ENDF format into libraries for applications. Over the last few years, a number of new capabilities have been added to the system to provide advanced features for MCNP, MCNPX, and other applications codes. These include probability tables for unresolved range self shielding, capabilities optimized for high-energy libraries (typically to 150 MeV for accelerator applications), options for detailed treatments of incident and outgoing charged particles, and a capability to handle photonuclear reactions. These new features and recent experience using NJOY99 for library production will be discussed, along with possible future work, such as delayed-neutron processing and capabilities to handle the new generation of photo-atomic, electro-atomic, and atomic-relaxation evaluations now becoming available in ENDF format. The latest version of the code, NJOY 2001, uses modern Fortran90 style, modularization, and memory allocation methods. The Evaluated Nuclear Data Files (ENDF) format has become the standard for representing nuclear data throughout the world, being used in the US ENDF/B libraries, the European JEF libraries, the Japanese JENDL libraries, and many others. At the same time, the NJOY Nuclear Data Processing System, which is used to convert evaluated nuclear data in the ENDF format into data libraries for nuclear applications, has become the method of choice throughout the world. The combination of these modern libraries of evaluated nuclear data and NJOY processing has proved very capable for classical applications in reactor analysis, fusion work, shielding, and criticality safety. However, over the last few years, new applications have appeared that require extended evaluated data and new processing techniques. A good example of this is the interest in accelerator-boosted applications, which has led to the need for data to higher energies, such as 150 MeV. New kinds of evaluated data are appearing, such as photonuclear cross sections and more detailed files for photo-atomic, electro-atomic, and atomic-relaxation data, and the processing methods must be upgraded appropriately. Finally, increased accuracy requirements and improvements in applications codes (such as the provision of probability tables for self shielding and delayed neutrons for time dependent calculations in MCNP) have led to other needs for improvements in processing methods.

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4 p.

Source

  • Submitted to: American Nuclear Society 12th Biennial RPSD Topical Meeting, April 14-18, 2002, Santa Fe, NM

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  • Report No.: LA-UR-02-0689
  • Report No.: LA-UR-02-689
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976073
  • Archival Resource Key: ark:/67531/metadc929667

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  • January 1, 2002

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 4:21 p.m.

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MacFarlane, R. E. (Robert E.). NJOY 99/2001: new capabilities in data processing, article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc929667/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.