**46-Pd-107 Review**

Keiichi SHIBATA, JAERI Nuclear Data Center, December 5, 2002

1.  **Files**

BROND-2: Year of origin 1985

ENDF/B-VI: Year of origin 1989

JEF-2.2: Year of origin 1982

JENDL-3.2: Year of origin 1990.

1.  **Thermal and Resonance Region**

BROND-2: Resolved resonance region below 700 eV; unresolved resonance
region between 0.7 and 300 keV.

ENDF/B-VI: Resolved resonance region below 1 keV; no unresolved
resonance region is given.

JEF-2.2: Resolved resonance parameters were taken from BNL-325 below
659.6 eV; unresolved resonance region between 659.6 eV and 50 keV.

JENDL-3.2: Resolved resonance region below 1 keV; unresolved resonance
region between 1 and 100 keV.

Thermal cross sections and resonance integral for Pd-107 (300K)

  -------------- -------------- -------------- -------------- --------------
                 Total (b)      Elastic (b)    Capture (b)    Cap. R.I. (b)

  JENDL-3.2      5.34270E+00    3.33447E+00    2.00823E+00    1.11252E+02

  ENDF/B-VI      5.15347E+00    3.08512E+00    2.06834E+00    1.09798E+02

  JEF-2.2        6.25746E+00    4.45180E+00    1.80566E+00    1.04841E+02

  BROND-2        6.48621E+00    4.10357E+00    2.38265E+00    1.20672E+02

  BNL-325                                      1.8±0.2        86.6
  -------------- -------------- -------------- -------------- --------------

**Recommendation**

In BROND-2, there exists a discontinuity of the total cross sections at
300 keV. The thermal elastic scattering cross sections are divided into
two groups: higher values of JEF-2.2 and BROND-2, and lower values of
JENDL-3.2 and ENDF/B-VI. I cannot judge which the best evaluation is.

2.  **Fast Neutron Region**

    1.  **Methodology**

[BROND-2]{.underline}

Taken from ENDF/B-V except for the capture cross section. As for the
capture cross section, the evaluation is based on experimental data in
the energy region from 0.3 to 0.5 MeV; the cross sections were taken
from JENDL-1 between 0.5 and 7 MeV; DSD calculations were performed
above 7 MeV. The library contains the total, elastic and inelastic
scattering and capture cross sections. Optical and statistical model
calculations were performed. The elastic scattering cross section was
obtained by subtracting a sum of partial cross sections from the total
cross section.

[ENDF/B-VI]{.underline}

Optical and statistical model calculations were performed. The library
contains the total, elastic and inelastic scattering, and capture cross
sections. The elastic scattering cross section was obtained by
subtracting a sum of partial cross sections from the total cross
section.

[JEF-2.2]{.underline}

Optical and statistical model calculations were performed. The library
contains the cross sections for the (n,n'), (n,2n), (n, γ), (n,p),
(n,d), (n,t), (n,^3^He), (n,α), and (n,2p) reactions as well as the
total and elastic scattering cross sections. Charged-particle emission
cross sections were calculated with the THRES-2 code.

[JENDL-3.2]{.underline}

Optical and statistical model calculations were performed. The library
contains the cross sections for the (n,n'), (n,2n), (n,3n), (n,nα),
(n,np), (n,nd), (n, γ), (n,p), (n,d), (n,t), and (n,α) reactions
together with the total and elastic scattering cross sections.. The DSD
process was considered for the capture reaction in a phenomenological
way. The elastic scattering cross section was obtained by subtracting a
sum of reaction cross sections from the total cross section.

1.  **MT=1**

I cannot judge which the best evaluation is.

2.  **MT=2**

I cannot judge which the best evaluation is.

3.  **MT=4**

The excitation functions of BROND-2 and ENDF/B-VI are not reasonable.

**3.5 MT=16**

I cannot judge which the best evaluation is, although only JENDL-3.2 and
JEF-2.2 give cross sections.

6.  **MT=102**

All evaluations reproduce experimental data below several hundred keV. I
cannot judge which the best evaluation is.

6.  **MT=103**

I cannot judge which the best evaluation is, although only JENDL-3.2 and
JEF-2.2 give cross sections.

7.  **MT=107**

I cannot judge which the best evaluation is, although only JENDL-3.2 and
JEF-2.2 give cross sections.

**Recommendation**

I would recommend JENDL-3.2 and JEF-2.2, because they have no obvious
drawback.