**WPEC SG 21: Assessment of Neutron Cross-Section Evaluations for the
Bulk of Fission Products**

**51-Sb-126 Review**

Drafted by ZHUANG Youxiang, CNDC, October 28, 2003

# Files

**ENDF/B-VI:** Year of origin 1974, taken from ENDF/B-V, no revisions
since then

**JEF-2:** Year of origin 1982, data taken mostly from ENDF/B-V, last
revision 1989

# Thermal and resonance region

**ENDF/B-VI: No** resonance parameters given, except AP; scattering

radius 6.0473 fm.

**JEF-2: No** resonance parameters given, except AP; scattering

radius 6.0473 fm.

.

**Recommendation/Conclusion:** **ENDF/B6** recommended in thermal and
resonance

region.

# Fast neutron region

·Methodology

**ENDF/B-VI, JEF-2:** Spherical OM for MT=1; capture from NCAP code;
inelastic cross sections

(MF=3, MT=4, 51-91) from COMNUC-3 code, no pre-equilibrium corrections.
MT=1, 2, 4,

51-58, 91, 102. **JEF-2** added**:**103\~107.

**Recommendation/Conclusion:** **ENDF/B6,** or **JEF-2** recommended in
fast energy region .

**Table 1.** Summary for Resolved and Unresolved Resonance Region:
Sb-126

+---------+-----+-------------+------+-----+-------------------------+
| Library | Y   | First       | RRR  | URR | Remarks                 |
|         | ear | Authors     |      |     |                         |
+---------+-----+-------------+------+-----+-------------------------+
| EN      | 1   | Schenter,   |      |     |                         |
| DF/B-VI | 974 |             |      |     |                         |
|         |     | Schmittroth |      |     |                         |
|         |     |             |      |     |                         |
|         |     | (NNDC)      |      |     |                         |
+---------+-----+-------------+------+-----+-------------------------+
| JEF-2   | 1   | Scientific  |      |     |                         |
|         | 982 |             |      |     |                         |
|         |     | Co          |      |     |                         |
|         |     | -ordination |      |     |                         |
|         |     |             |      |     |                         |
|         |     | Group       |      |     |                         |
|         |     |             |      |     |                         |
|         |     | (NEA)       |      |     |                         |
+---------+-----+-------------+------+-----+-------------------------+

**Table 2.** Thermal Cross Sections for Sb-126

+---------------------------+-------------+-------------+-------------+
| Library / Experiment      | Total       | Capture     | Elastic     |
+---------------------------+-------------+-------------+-------------+
| ENDF/B-VI                 | 10.395 b    | 5.8 b       | 4.595 b     |
+---------------------------+-------------+-------------+-------------+
| JEF-2                     | 10.395 b    | 5.8 b       | 4.595 b     |
+---------------------------+-------------+-------------+-------------+
| BNL-325 (1981)            |             |             |             |
+---------------------------+-------------+-------------+-------------+
| S.F.Mughabghab,           |             |             |             |
| INDC(NDS)-424,            |             |             |             |
|                           |             |             |             |
| p.72 (2001)               |             |             |             |
+---------------------------+-------------+-------------+-------------+