ETOP 14, a FORTRAN code to process ENDF/B data into the 68-group PHROG library format

ETOP 14 processes neutron cross section data from the ENDF/B format to the 68-group PHROG fast spectrum code. Major changes have accompanied modifications in the ENDF/B format and modifications to the PHROG code necessitated by changes in the ENDF/B format. A large number of program changes have been made to increase the program's efficiency and accuracy in treating specific cross sections. The present version of the program will process all Version 4 ENDF/B formats except the Adler-Adler multilevel resonance formula. ETOP 14 calculates infinitely dilute capture and fission cross sections and an infinitely dilute elastic scattering matrix for these materials over the resonance range. This limitation will be corrected in the near future. Some reaction cross sections which are only prominent above 10 MeV are ignored by ETOP 14. The code in its present form can be easily extended above 10 MeV. The maximum number of multigroups permitted is 99 even though the PHROG library is presently limited to 68 quarter lethargy groups. The present report assumes a complete familiarity with the ENDF/B format.