**1. NAME AND TITLE OF DATA LIBRARY**

L26P3S34: END**L** **26**-Group up to **P**_{3} Library Prepared by **S**UPERTOG for **34** Materials.

**2. NAME AND TITLE OF DATA RETRIEVAL PROGRAM**

BCBN: Code to Convert Library from Card Image to Binary Form.

**3. CONTRIBUTOR**

Bulgarian Academy of Sciences, Sofia, Bulgaria.

**4. HISTORICAL BACKGROUND AND INFORMATION**

The L26P3S34 library is produced from the Evaluated Nuclear Data File ENDL-2 by means of a
modified version of the SUPERTOG-3 code. SUPERTOG computes the average scattering cross
sections for given energy groups as well as the P_{n}-matrices of elastic, inelastic and (n,2n) scattering.

**5. APPLICATION OF THE DATA**

The use of SUPERTOG for converting the evaluated data of ENDL into multigroup constants
displays at least two peculiarities: a) The cross-section smooth and resonance parts are combined in
ENDL-2; therefore, the SUPERTOG routines for resonance processing are skipped; b) The elastic-scattering anisotropy data in ENDL-2 have the form of tabulated values of the probability-density
function which depends on the scattering angle and on the incident energy.

**6. SOURCE AND SCOPE OF DATA**

A 26-group 34-material library prepared by a modified version of SUPERTOG from the ENDL-2 evaluated data file is presented. A brief description of the algorithm of Legendre's polynomial expansion is given. This algorithm constitutes the basis of converting the tabulated anisotropy data of ENDL-2 into a form suitable for SUPERTOG processing.

The materials included in the library are:

Ti, ^{1}H, ^{12}C, ^{14}Ni, ^{16}O, ^{19}Fl, Mg, ^{27}Al, Si, Ar, ^{31}P, ^{32}S, Cr, ^{55}Mg, ^{59}Co, Ni, Mo, ^{93}Ni, Sn, ^{6}Li, ^{7}Li, ^{10}B,
^{11}B, ^{4}He, Zr, ^{138}Ba, Cl, ^{181}Ta, ^{239}Pu, ^{240}Pu, ^{235}U, Pb, Fe, Cu.

**7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM**

BCBN does a simple conversion from card image to binary form. No input required.

**8. DATA FORMAT AND COMPUTER**

Card image, ANISN format; IBM 370/3033.

**9. TYPICAL RUNNING TIME**

Conversion from card image to binary form required 20 sec. on the IBM 3033.

**10. REFERENCE**

G. Voykov, V. Gadjokov, and S. Minchev, "L26P3S34 - A 26-Group Library for the Computation
of Neutron Transfer in Shielding Media" Informal Notes.

**11. CONTENTS OF LIBRARY**

Included are the referenced document and one (1.2MB) DOS diskette which contains the cross
section library materials, the retrieval program, plus output from the sample problem.

**12. DATE OF ABSTRACT**

April 1985.

**KEYWORDS:** NEUTRON CROSS SECTION