**46-Pd-105 Review**

Keiichi SHIBATA, JAERI Nuclear Data Center, December 4, 2002

**1. Files**

BROND-2: Year of origin 1984

CENDL-3: Year of origin 1999

ENDF/B-VI: Year of origin 1999

JEF-2.2: Year of origin 1983

JENDL-3.2: Year of origin 1990.

**2. Thermal and Resonance Region**

BROND-2: Resolved resonance region below 2 keV; unresolved resonance
region between 2 and 283.2 keV.

CENDL-3: taken from JENDL-3.2

ENDF/B-VI: Resolved resonance region below 2.0535 keV; unresolved
resonance region.between 2.0535 and 283.207 keV.

JEF-2.2: Resolved resonance region below 2.06 keV; unresolved resonance
region between 2.06 and 20 keV.

JENDL-3.2: Resolved resonance region below 2.0485 keV; unresolved
resonance region between 2.0485 keV and 100 keV.

Thermal cross sections and resonance integral for Pd-105 (300K)

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

  JENDL-3.2       2.54045E+01   5.15146E+00   2.02530E+01   9.58012E+01

  ENDF/B-VI       2.82420E+01   7.36076E+00   2.08813E+01   9.52024E+01

  JEF-2.2         2.70754E+01   5.24572E+00   2.18297E+01   9.30789E+01

  CENDL-3         2.61769E+01   5.15146E+00   2.10254E+01   9.30789E+01

  BROND-2         2.62892E+01   4.35775E+00   2.19315E+01   1.08696E+02

  BNL-325                       5.00.6        20.03.0       98

  Mughabghab01                                21.01.5       
  --------------- ------------- ------------- ------------- -------------

**Recommendation**

The total cross section of ENDF/B-VI is abnormally enhanced at the upper
end of the unresolved resonance region. This problem would be solved by
inserting the 283.207 keV point with \~10^-5^ b into MF/MT=3/1. There
are discontinuities between the unresolved resonance and fast-energy
regions for the total cross sections adopted in CENDL-3 and BROND-2. The
data of JENDL-3.2 and JEF-2.2 are recommended.

**3. 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 283.2 -- 700 keV; the cross sections are smoothly
matched to JENDL-1 between 0.7 and 2 MeV; the cross sections were taken
from JENDL-1 between 2 and 8 MeV; DSD calculations were performed above
8 MeV.

[CENDL-3]{.underline}

Optical and statistical model calculations were performed. The direct
interaction was considered for the inelastic scattering using DWBA. The
library contains the cross sections for the (n,n'), (n,2n), (n,3n),
(n,n), (n,np), (n,), (n,p), (n,d), (n,t), (n,^3^He), and (n,) reactions
together with the total and elastic scattering cross sections. 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 direct
interaction was considered for the inelastic scattering to four levels
by using the coupled-channel method. The library contains the cross
sections for the (n,n'), (n,2n), (n,3n), (n,4n), (n,n), (n,2n), (n,np),
(n,nd), (n,2np), (n, ), (n,p), (n,d), (n,) reactions as well as the
total and elastic scattering cross sections.

[JEF-2.2]{.underline}

No detailed information is given on the evaluation method. The library
contains the cross sections for the (n,n'), (n,2n), (n, ), (n,p), (n,d),
(n,t), (n,^3^He), (n,), and (n,2p) reactions as well as the total and
elastic scattering cross sections.

[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,n),
(n,np), (n,nd), (n, ), (n,p), (n,d), (n,t), (n,^3^He), and (n,)
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.

2.  **MT=1**

The cross sections of BROND-2 and JEF-2,2 are too high around 20 MeV as
compared with the measured total cross section of elemental Pd.

3.  **MT=2**

I cannot judge which the best evaluation is.

4.  **MT=4**

The excitation function of BROND-2 is very different from those of the
other libraries.

5.  **MT=16**

I cannot judge which the best evaluation is.

6.  **MT=102**

All evaluations reproduce experimental data available below several
hundred keV. However, above several hundred keV, all evaluations have
different cross section shapes.

7.  **MT=103**

I cannot judge which the best evaluation is.

8.  **MT=107**

I cannot judge which the best evaluation is.

**Recommendation**

I would recommend JENDL-3.2, although direct interaction was not
considered for the inelastic scattering. If the problem of ENDF/B-VI
mentioned in Sec. 2 were solved, the ENDF/B-VI data would be better than
JENDL-3.2.