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

**52-Te-124 Review**

Drafted by ZHUANG Youxiang, CNDC, November 5, 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

**JENDL-3:** Year of origin 1990, last revision 1993

# Thermal and resonance region

**ENDF/B-VI:** Resolved resonance parameters up to 5.6953 keV from
BNL-325 (1973), scattering

radius 6.0149 fm, no unresolved resonance region.

**JEF-2:** Resolved resonance parameters up to 5.6953 keV from BNL-325
(1973), scattering

radius 6.0149 fm, no unresolved resonance region.

.

**JENDL-3:** Resolved resonance parameters up to 7 keV, scattering
radius

5.8 fm, unresolved resonance region extended up to 100 keV (Table 1).

**Recommendation/Conclusion:** **JENDL-3** recommended in thermal and
resonance

region up to 100 keV.

# 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,

51-61, 91, 102. **JEF-2** added**:** 103\~107.

**JENDL-3:** Spherical OM and statistical model code CASTHY for MT=1, 4,
51-91, 102 by

taking into account competing reactions MT=16, 17, 103, 107 calculated
with the pre-equilibrium

and multi-step evaporation model code PEGASUS. Direct and semi-direct
capture estimated;

elastic calculated as (MT1 -- sum of partial cross sections); Legendre
coefficients from CASTHY

to get unisotropic angular distribution for MF=4, MT=2 in CM system.
MT=1, 2, 4, 16, 17, 22, 28,

51-65, 91, 102\~107.

·MT=16, 17, 22, 28

**JENDL-3:**.has a complete data set, including MT=16, 17, 22, 28.

**Recommendation/Conclusion:** **JENDL-3** recommended in fast energy
region

100 keV - 20 MeV. The shape of (n,inl) cross section is reasonable, and
the coincidences of

(n,γ) cross sections with experimental values are better.

**Table 1.** Summary for Resolved and Unresolved Resonance Region:
Te-124

+---------+-----+-------------+------+-----+-------------------------+
| Library | Y   | First       | RRR  | URR | Remarks                 |
|         | ear | Authors     |      |     |                         |
+---------+-----+-------------+------+-----+-------------------------+
| EN      | 1   | Schenter,   | 5.   | \-  | RR parameters from      |
| DF/B-VI | 974 |             | 6953 |     | BNL-325 (1973).         |
|         |     | Schmittroth | keV  |     |                         |
|         |     |             |      |     |                         |
|         |     | (NNDC)      | SLBW |     |                         |
+---------+-----+-------------+------+-----+-------------------------+
| JEF-2   | 1   | Scientific  | 5.   | \-  | RR parameters from      |
|         | 982 |             | 6953 |     | BNL-325 (1973).         |
|         |     | Co          |      |     |                         |
|         |     | -ordination | keV  |     |                         |
|         |     |             |      |     |                         |
|         |     | Group       | MLBW |     |                         |
|         |     |             |      |     |                         |
|         |     | (NEA)       |      |     |                         |
+---------+-----+-------------+------+-----+-------------------------+
| JENDL-3 | 1   | JNDC FP     | 7    | 100 | RR parameters from      |
|         | 990 |             |      | keV | BNL-325 (1981), above 7 |
|         |     | Nuclear     | keV  |     | keV were newly          |
|         |     | Data        |      |     | evaluated.              |
|         |     |             | MLBW |     |                         |
|         |     | Working     |      |     |                         |
|         |     |             |      |     |                         |
|         |     | Group       |      |     |                         |
+---------+-----+-------------+------+-----+-------------------------+

**Table 2.** Thermal Cross Sections for Te-124

+---------------------------+-------------+-------------+-------------+
| Library / Experiment      | Total       | Capture     | Elastic     |
+---------------------------+-------------+-------------+-------------+
| ENDF/B-VI                 | 10.6158 b   | 6.79999 b   | 3.81578 b   |
+---------------------------+-------------+-------------+-------------+
| JEF-2                     | 10.6598 b   | 6.79990 b   | 3.84159 b   |
+---------------------------+-------------+-------------+-------------+
| JENDL-3                   | 10.437 b    | 6.785 b     | 3.653 b     |
+---------------------------+-------------+-------------+-------------+
| BNL-325 (1981)            |             | 6.8±        |             |
|                           |             |             |             |
|                           |             | 1.3 b       |             |
+---------------------------+-------------+-------------+-------------+
| S.F.Mughabghab,           |             | 6.8±        |             |
| INDC(NDS)-424,            |             |             |             |
|                           |             | 1.3 b       |             |
| p.72 (2001)               |             |             |             |
+---------------------------+-------------+-------------+-------------+