NEA-0680 ZZ-UKCTRIIIA.

1. NAME OR DESIGNATION OF PROGRAM:  ZZ-UKCTRIIIA - Transmutation and Activation Data Library.

3. DESCRIPTION OF PROBLEM OR FUNCTION


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

  FORMAT: GAM-II energy structure

  NUMBER OF GROUPS: 100-group

NUCLIDES: H, He, Li, Be, B, C,N, O, F, Na, Mg, Al, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Sr, Y, Zr, Nb, Mo, Tc, Ru, Ag, Cd, In, Sn, Sb, Cs, Gd, Ho, Lu, Hf, Ta, W, Re, Ir, Pt, Au, Hg, Tl, Pb, Bi, Th, Pa, U, Pu.

  ORIGIN: ENDF/B-4, DLC-69/ACTL, UKCTRIII

WEIGHTING SPECTRUM: Prepared from point cross section data using a  1/E weighting function, except near 14.07 MeV where a thermally broadened (T = 20 keV) fusion peak is employed. Thermal cross sections are quoted for TO = 293 kelvin being computed either from point cross sections (e.g. as in ACTL) or as 0.862 x sigma(2200) (as appropriate for a 1/v absorber in a Maxwell-Boltzmann distribution of neutron energies at temperature TO).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
The nuclear cross section data library UKCTRIIIA provides multigroup neutron reaction cross section data covering the energy range from thermal to 15 MeV. It is intended, primarily, for use in studies of transmutation and activation of fusion reactor structural and coolant materials. The present document describes the content and format of the library UKCTRIIIA. The cross sections are given for the following reaction types:

(n,n') to isomer, (n,2n), (n,gamma), (n,p), (n,alpha),
(n,n'p)+(n,d), (n,n'alpha), (n,n'pn)+(n,n'd)+(n,t), (n,3n),
(n,He-3)

and for isotopes of the following nuclides:

H, He, Li, Be, B, C,N, O, F, Na, Mg, Al, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Sr, Y, Zr, Nb, Mo, Tc, Ru, Ag, Cd, In, Sn, Sb, Cs, Gd, Ho, Lu, Hf, Ta, W, Re, Ir, Pt, Au, Hg, Tl, Pb, Bi, Th, Pa, U, Pu.

4. METHOD OF SOLUTION

The THRES2 code was used extensively to pro- vide synthetic cross sections for the particle-emitting reactions.
The application of THRES2 was restricted to nuclides with A more than or equal to 34 and possessing decay half-lives in excess of 10 days. The library DLC-69/ACTL, produced by Gardener and Howerton  has been processed into multigroup form and merged with the pre- vious UKCTRIII version in such a manner that, where an overlap ex- ists, the ACTL data set is preferred to all other sources except ENDF/B-4. The cross sections are prepared in 100-group form, using the GAM-II energy structure.

The UKCTRIIIA library follows the DLC-33C prescription of being pre- pared from point cross section data using a 1/E weighting function,  except near 14.07 MeV where a thermally broadened (T = 20 keV) fusion peak is employed. Thermal cross sections are quoted for TO = 293 deg. kelvin being computed either from point cross sec- tions (e.g. as in ACTL) or as 0.862 x sigma(2200) (as appropriate for a 1/v absorber in a Maxwell-Boltzmann distribution of neutron energies at temperature TO). Group 100 cross sections (i.e. thermal  cross sections) can be obtained for other temperatures by applying the scaling factor SQRT(TO/T).

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM

The UKCTRIIIA data format dif- fers from that of its progenitor DLC-33C in that the latter always provided 100 cross section values whereas the former suppresses those zeros which refer to energies below the reaction threshold; this reduces the number of records in the library by 60%.

8. RELATED AND AUXILIARY PROGRAMS

THRES2 - a code to calculate neutron induced reaction cross sections from 0 to 20 MeV in medium mass nuclei. ORIGEN - the ORNL isotope generation and depletion code.

10. REFERENCES

- O.N. Jarvis:
  "Description of the Transmutation and Activation Data Library
   UKCTRIIIA"
  AERE-R960 (Rev.), (May 1980).
- "DLC-33C/MONTAGE 400. 100-Group Neutron Activation Cross Section
   Data for Fusion Reactor Structure and Coolant Materials"
  RSIC Data Library Collection, Oak Ridge National Laboratory,
Radiation Shielding Information Center, Oak Ridge, Tennessee, USA.  - S. Pearlstein:
  "Neutron-Induced Reactions in Medium Mass Nuclei"
  J. Nucl. Energy 27, 81 (1973).
- M.A. Gardner and R.J. Howerton:
  "ACTL - Evaluated Neutron Activation Cross Section Library -
   Evaluation Techniques and Reaction Index"
  UCRL-50400 (Vol. 18), Lawrence Livermore Laboratory (1978).
  Available from the Radiation Shielding Information Center, Oak
  Ridge under package name DLC-69/ACTL.
- M.J. Bell:
  "ORIGEN - The ORNL Isotope Generation and Depletion Code"
  ORNL-4628 (1973).  Available from the Radiation Shielding
Information Center, Oak Ridge, as Computer Code Collection CCC-217  - O.N. Jarvis:
  "Transmutation and Activation of Fusion Reactor Wall and
   Structural Materials"
  U.K.A.E.A. Report AERE-R 9298 (1979).

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

          O. N. Jarvis
          Nuclear Physics Division
          A.E.R.E., Harwell
          Harwell, Didcot
          Oxfordshire OX11 ORA
          United Kingdom

File name	File description	Records
NEA0680_01.001	UKCTRIIIA SYMBOLIC DATA LIBRARY	10248
NEA0680_01.002	UKCTRIIIA RETRIEVAL PROGRAM SOURCE	34
NEA0680_01.003	UKCTRIIIA OUTPUT	1531
NEA0680_01.004	UKCTRIIIA JCL AND INFORMATION	59