39-Y - 0 LLNL EVAL-Dec89 D.E.Cullen UCRL-50400,Vol.31 DIST-MAY10 20100228 ----JENDL-4.0 MATERIAL 3900 -----ELECTRO-ATOMIC INTERACTION DATA ------ENDF-6 FORMAT ================================================================== The data were taken from EEDL. ================================================================== The Livermore Evaluated Electron Data Library (EEDL) in the ENDF-6 Format. Translated from the Livermore ENDL format to the ENDF-6 Format by Bob MacFarlane (Los Alamos). ================================================================== Contents ================================================================== MF/MT Description ================================================================== 23/526 Elastic Scattering Cross Sections 23/527 Bremsstrahlung Cross Sections 23/528 Excitation Cross Sections 23/534 K (1S1/2) Electroionization Subshell Cross Sections 23/535 L1 (2s1/2) Electroionization Subshell Cross Sections 23/536 L2 (2p1/2) Electroionization Subshell Cross Sections 23/537 L3 (2p3/2) Electroionization Subshell Cross Sections 23/538 M1 (3s1/2) Electroionization Subshell Cross Sections 23/539 M2 (3p1/2) Electroionization Subshell Cross Sections 23/540 M3 (3p3/2) Electroionization Subshell Cross Sections 23/541 M4 (3d3/2) Electroionization Subshell Cross Sections 23/542 M5 (3d5/2) Electroionization Subshell Cross Sections 23/543 N1 (4s1/2) Electroionization Subshell Cross Sections 23/544 N2 (4p1/2) Electroionization Subshell Cross Sections 23/545 N3 (4p3/2) Electroionization Subshell Cross Sections 23/546 N4 (4d3/2) Electroionization Subshell Cross Sections 23/547 N5 (4d5/2) Electroionization Subshell Cross Sections 23/550 O1 (5s1/2) Electroionization Subshell Cross Sections ================================================================== 26/526 Elastic Scattering Angular Distributions 26/527 Bremsstrahlung Photon Energy Spectra and Electron Average Energy Loss 26/528 Excitation Electron Average Energy Loss 26/534 K (1S1/2) Electroionization Subshell Energy Spectra 26/535 L1 (2s1/2) Electroionization Subshell Energy Spectra 26/536 L2 (2p1/2) Electroionization Subshell Energy Spectra 26/537 L3 (2p3/2) Electroionization Subshell Energy Spectra 26/538 M1 (3s1/2) Electroionization Subshell Energy Spectra 26/539 M2 (3p1/2) Electroionization Subshell Energy Spectra 26/540 M3 (3p3/2) Electroionization Subshell Energy Spectra 26/541 M4 (3d3/2) Electroionization Subshell Energy Spectra 26/542 M5 (3d5/2) Electroionization Subshell Energy Spectra 26/543 N1 (4s1/2) Electroionization Subshell Energy Spectra 26/544 N2 (4p1/2) Electroionization Subshell Energy Spectra 26/545 N3 (4p3/2) Electroionization Subshell Energy Spectra 26/546 N4 (4d3/2) Electroionization Subshell Energy Spectra 26/547 N5 (4d5/2) Electroionization Subshell Energy Spectra 26/550 O1 (5s1/2) Electroionization Subshell Energy Spectra ================================================================== Warning ================================================================== MF/MT combinations used to define ALL electron interaction data are newly defined MF/MT numbers for ENDF/B-VI that did not exist in earlier versions of ENDF/B. ================================================================== Definition of Data ================================================================== Cross Sections (MF=23) ================================================================== 1) The total electron interaction cross section is not given explicitly; it is equal to the sum of the elastic scatter, bremsstrahlung, excitation, and ionization cross sections, i.e., MT = 526, 527, 528, and 534 through 572. 2) The total electroionization cross section is not given explicitly; it is equal to the sum of the electroionization subshell cross sections, i.e., all MT = 534 through 572. ================================================================== Angular and Energy Distributions (MF=26) ================================================================== 3) For Elastic Scattering, the angular distribution of scattered electrons is tabulated between cosine = -1.0 and +0.999999. Between +0.999999 and +1.0 it is analytically defined as Coulomb scattering, d[Sig]/d(Cos) = A/[eta+(1.0 - Cos)]^2 where the shielding parameter (eta) is defined by Steve Seltzer's expression (see, ref. 1), and the normalization (A) is defined for continuity with the tabulated data at Cos = +0.999999. Electron "elastic" scattering means no energy loss, so only angular distributions are given. 4) For bremsstrahlung, both the outgoing electron and photon are described. The photon energy spectra are given, but angular distributions are not; these can be analytically defined by a number of different methods. For the electron, average energy loss is given. The electron is assumed to continue along its original direction of travel, so angular distributions are not given. WARNING - bremsstrahlung is a three body process, involving an electron, a photon, and an atom - so that you cannot use energy or momentum correlation to simply relate the secondary electron and the emitted photon. 5) For excitation, the average energy loss of the electron is given. The electron is assumed to continue along its original direction of travel, so angular distributions are not given. 6) For Ionization, the spectra of electrons is given. The electron is assumed to continue along its original direction of travel, so angular distributions are not given. In ionization two identical electrons emerge; the incident electron, and an electron ejected by the atom [thereby ionizing the atom]. Since the two particles are indistinquishable, we define the electron with the lower energy to be that ejected by the atom, and the electron with the higher energy to be the incident electron. The energy of the two electrons is exactly correlated by energy conservation: initial incident electron energy = binding energy of the ejected electron, plus the kinetic energy of the ejected and the secondary incident electron. Therefore only the spectra of the lower energy, ejected electron is given. The energy of the secondary incident electron should be defined to conserve energy, as described above. The energy lost by the incident electron is the sum of the binding and kinetic energy of the ejected electron. 7) Relaxation of ionized atoms back to neutrality is not described here; it is described in the companion Evaluated Atomic Data Library (EADL). ================================================================== References ================================================================== 1) S.T. Perkins, D.E. Cullen, and S.M. Seltzer, "Tables and Graphs of Electron-Interaction Cross Sections from 10 eV to 100 GeV Derived from the LLNL Evaluated Electron Data Library (EEDL), Z = 1-100, UCRL-50400, Vol. 31, Lawrence Livermore National Laboratory (1991). 2) D.E. Cullen "PROGRAM EPICSHOW: A Computer Code to Allow Interactive Viewing of the EPIC Data Libraries" (Version 2000-1), UCRL-ID-1264455, Rev. 3, Part 4, Lawrence Livermore National Laboratory (2000). These are the primary references to the contents of this library and they contains a complete list of references to the sources of data used in this library, methods of evaluation, accuracy of the data, etc. ================================================================== History ================================================================== (1) November, 1991 - Initial release in the ENDL format. (2) October, 2001 - Initial release in the ENDF-6 format. ==================================================================