**1. NAME AND TITLE**

RESENDD: A Code System for Reconstruction of Resonance Cross Sections from Evaluated
Nuclear Data in ENDF/B Format.

**2. CONTRIBUTOR**

Japan Atomic Energy Research Institute, Tokyo, Japan, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; CDC CYBER 740 (A) and VAX-11/70 (B).

**4. NATURE OF PROBLEM SOLVED**

RESENDD is a computer code system for calculating resonance cross sections from evaluated
resonance parameters in the ENDF/B format.

**5. METHOD OF SOLUTION**

RESENDD is an improvement of RESEND done by modifying the multi-level Breit-Wigner formula, adding a function of Doppler broadening cross sections and of calculating zero-Kelvin cross sections.

RESENDD has the following new functions not available in RESEND: 1) both ENDF/B-IV and ENDF/B-V formats are available for an input file; 2) calculations method of the multi-level Breit-Wigner formula was improved not to take a long CPU time and to permit J-unknown resonances; 3) an energy dependent scattering radius can be treated; 4) resonance parameters for the Reich-Moore formula can be processed; 5) modification of energy selection method was made; 6) option for interpolation in the unresolved resonance region was introduced; 7) distant resonances can be treated approximately.

RESENDD can treat the multilevel Breit-Wigner formula even in the case where J values of
resonances are unknown. The Reich-Moore formula also can be treated. In the case of unresolved
resonance cross section calculation, parameter of cross-section interpolation may be chosen.

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

No study has been made by RSIC of typical running times for RESENDD.

**8. COMPUTER HARDWARE REQUIREMENTS**

RESENDD is operable on the CDC CYBER 740 (A) or the VAX-11/780 (B) computers. For
compilation of RESENDD, the AUTODBL (DBLPAD) option is recommended.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A Fortran IV compiler is required.

**10. REFERENCE**

T. Nakagawa, "Program RESENDD (Version 84-07): A Program for Reconstruction of Resonance
Cross Sections from Evaluated Nuclear Data in the ENDF/B Format (Modified Version of RESEND),"
AERI-M 84-192 (September 1984).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and two (1.2MB) DOS diskettes which contain the source
code, cross section library data, and sample problem input.

**12. DATE OF ABSTRACT**

June 1986.

**KEYWORDS: ** NEUTRON CROSS SECTION PROCESSING; ENDF FORMAT