97-Bk- 0
97-Bk- 0 LLNL EVAL-Jul97 D.E.Cullen, et al.
UCRL50400,Vol.6,Rev.5 DIST-MAY10 20100228
----JENDL-4.0 MATERIAL 9700
-----PHOTO-ATOMIC INTERACTION DATA
------ENDF-6 FORMAT
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The data were taken from EPDL97.
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The Livermore Evaluated Photon Data Library (EPDL97) in the
ENDF/B-VI format
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Contents
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MF/MT Description
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23/501 Total cross sections
23/502 Coherent scattering cross sections
23/504 Incoherent scattering cross sections
23/515 Pair production cross sections, Electron field
23/516 Pair production cross sections, Total
23/517 Pair production cross sections, Nuclear field
23/522 Total photoionization cross section
23/534 K (1S1/2) Photoionization subshell cross section
23/535 L1 (2S1/2) Photoionization subshell cross section
23/536 L2 (2P1/2) Photoionization subshell cross section
23/537 L3 (2P3/2) Photoionization subshell cross section
23/538 M1 (3S1/2) Photoionization subshell cross section
23/539 M2 (3P1/2) Photoionization subshell cross section
23/540 M3 (3P3/2) Photoionization subshell cross section
23/541 M4 (3D3/2) Photoionization subshell cross section
23/542 M5 (3D5/2) Photoionization subshell cross section
23/543 N1 (4S1/2) Photoionization subshell cross section
23/544 N2 (4P1/2) Photoionization subshell cross section
23/545 N3 (4P3/2) Photoionization subshell cross section
23/546 N4 (4D3/2) Photoionization subshell cross section
23/547 N5 (4D5/2) Photoionization subshell cross section
23/548 N6 (4F5/2) Photoionization subshell cross section
23/549 N7 (4F7/2) Photoionization subshell cross section
23/550 O1 (5S1/2) Photoionization subshell cross section
23/551 O2 (5P1/2) Photoionization subshell cross section
23/552 O3 (5P3/2) Photoionization subshell cross section
23/553 O4 (5D3/2) Photoionization subshell cross section
23/554 O5 (5D5/2) Photoionization subshell cross section
23/555 O6 (5F5/2) Photoionization subshell cross section
23/556 O7 (5F7/2) Photoionization subshell cross section
23/559 P1 (6S1/2) Photoionization subshell cross section
23/560 P2 (6P1/2) Photoionization subshell cross section
23/561 P3 (6P3/2) Photoionization subshell cross section
23/562 P4 (6D3/2) Photoionization subshell cross section
23/563 P5 (6D5/2) Photoionization subshell cross section
23/570 Q1 (7S1/2) Photoionization subshell cross section
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27/502 Coherent scattering form factors
27/504 Incoherent scattering functions
27/505 Imaginary anomalous scattering factor
27/506 Real anomalous scattering factor
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Warning
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MF/MT combinations used to define photoionization subshell cross
sections (MF=23, MT=534-572) and coherent anomalous scattering
factors (MF=27, MT=505 AND 506) are newly defined MF/MT numbers
for ENDF/B-VI that did not exist in earlier versions of ENDF/B.
If you are not prepared to use this data you need merely delete
it and all of the remaining data will still be consistent and
equivalent to the types of data in earlier versions of ENDF/B.
However, this will limit the range of problems to which this
data can be applied (see: ref. 1 for details).
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Definition of new types of data
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1) The total photoionization cross section is equal to the sum
of the photoionization subshell cross sections.
For each subshell on the second line of a section the C1 and
C2 fields are defined as,
EPE = The photoionization edge energy (similar to Q-value)
EFL = The fluorescence yield (eV/photoionization)
2) The angular distribution of coherently scattered photons is,
S(E,MU) = 3*T/8*(1 + MU**2)*((FF(M)+F1(E))**2+(F2(E))**2)
S(E,MU) = Angular distributions (barns per unit cosine)
T = The Thomson cross section
MU = The cosine of the scattering angle
FF(M) = The atomic form factor
M = Momentum transfer = SIN(THETA/2)/LAMBDA/4*PI
F1(E) = The real anomalous scattering factor
F2(E) = The imaginary anomalous scattering factor
F1(E) and F2(E) are isotropic.
When F1(E) = F2(E) = 0 this reduces to the result obtained
using only form factors (the older ENDF/B convention).
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Differences between EPDL97 and the data base presented here
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1) Energy range - EPDL97 - 1 eV to 100 GeV
Here - 1 eV TO 100 GeV (previously 100 MeV)
2) Type of Data - EPDL97 - Photon interaction including
photoexcitation
Here - Photon interaction - ENDF/B-VI has
no provision for photoexcitation
3) Secondary E - EPDL97 - Average energy of each secondary
(photons, electrons, positrons)
HERE - No secondary energy data
4) Interpolation- EPDL97 - Cross sections are Log X vs. Log Y
interpolable - the total cross
section is not included
- Form factors and scattering functions
are Log X vs. Log y, except first
interval.
- Anomalous scattering factors linearly
interpolable (they can be negative)
Here - Up through ENDF/B-V photon interaction
cross sections were Log X vs. Log Y.
- For the first two Mods. of ENDF/B-VI
in order to consistently define the
total cross sections at ALL energies
all cross sections were linearized.
This was NOT a good idea.
- Starting with Mod. 3, cross sections
are left in Log X vs. Log. Y form so
that they are IDENTICAL to what's in
EPDL97.
The total is defined ONLY at the
energies tabulated in any other cross
section.
WARNING - As a result the total cross section
MUST NOT be interpolated to define the
total between tabulated energies. The
ONLY consist way to define the total
between tabulated energies is to
interpolate all of the partials and
add them up.
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References
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1) D.E. Cullen, M.H. Chen, J.H. Hubbell, S.T. Perkins,
E.F. Plechaty, J.A. Rathkopf and J.H. Scofield, Tables and
graphs of photon interaction cross sections from 10 eV to 100
GeV derived from the LLNL Evaluated Photon data library (EPDL),
UCRL-50400, Vol. 6, Rev. 4, Part A: Z = 1 to 50 and Part B:
Z = 51 to 100, Lawrence Livermore National Laboratory (1989)
2) D.E. Cullen, J.H. Hubbell and L.D. Kissel, EPDL97: the
Evaluated Photon Data Library, '97 Version, UCRL-50400, Vol. 6,
Rev. 5, Lawrence Livermore National Laboratory (1997)
These are the primary references to the contents of this library
and they contain a complete list of references to the sources
of data used in this library, methods of evaluation, accuracy
of the data, etc.
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History
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Mod. 1 - October, 1989 - Initial release.
Mod. 2 - August, 1990 - Updated photoionization total and
subshell cross sections.
Mod. 3 - July, 1997 - Complete re-evaluation.
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