NEA-1787: ZZ-CRYO-S(A,B)-ACE1, Scattering law and continuous energy cross section library of materials at cryogenic temperatures

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NEA-1787 ZZ-CRYO-S(A,B)-ACE1. (Abstract last modified 28-MAY-2007)

ZZ-CRYO-S(A,B)-ACE1, Scattering law and continuous energy cross section library of materials at cryogenic temperatures

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OR DESIGNATION - ZZ-CRYO-S(A,B)-ACE1

2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name Package-ID Status ZZ-CRYO-S(A,B)-ACE1 NEA-1787/01 Tested

Machines used: Package-ID Orig.Computer Test Computer NEA-1787/01 Many Computers PC Windows

3. DESCRIPTION -
Efforts devoted to developing or improving thermal scattering data (S(alpha,beta)) for very cold and cryogenic temperatures have recently been carried out. Here several evaluations carried out at the Institut für Kernenergetik und und Energiesysteme (IKE), University of Stuttgart are made available. They are listed in the following Table.

Liquid hydrogen and deuterium for the two modifications: ortho and para
Material        MAT*    Temperatures (K)   ID ACE* files
para Hydrogen    2      14, 16 and 20.38   pH.00t, pH.01t, pH.03t
ortho Hydrogen   3      14, 16 and 20.38   oH.00t, oH.01t, oH.03t
para Deuterium  12      19 and 23.65       pD.00t, pD.01t
ortho Deuterium 13      19 and 23.65       oD.00t, oD.01t

H in polyethylene (CH2)
Material        MAT     Temperatures (K)    ID  ACE files
H in CH2        37      87, 293.6 and 350   poly.01t, poly.03t, poly.04t
                                            poly.11t, poly.13t, poly.14t

Liquid argon
Material        MAT     Temperature (K)     ID  ACE file
18-Ar           18      87                  argon.01t, argon.11t

Aluminium face centred cubic lattice
Material    MAT   Temperatures (K)             ID  ACE files
13-Al-27    61    20, 77, 87, 100, 293.6, 400  al.00t,al.01t,al.02t,al.03t,
                                               al.04t,al.05t,
                                               al.10t,al.11t,al.12t,al.13t,
                                               al.14t,al.15t

* MAT numbers for the ENDF files and ID's for ACE (MCNP continuous energy data libraries)

The datasets are provided in the standard ENDF-6 format and in the ACE format, used for continuous energy Monte Carlo applications. Cross section libraries can be produced also for deterministic approaches through the use of the NJOY computer code. It should be noted that for very cold temperatures special care must be taken in processing the data and occasionally patches need to be applied to the processing code.

4. - Processing of the S(alpha,beta) data to energy dependent differential and integral cross sections as well as data sets for neutron transport calculations has been carried out e.g. MCNP(X). This was done with the following sequence of modules from NJOY-99.161: RECONR - BROADR - THERMR - ACER. ACE format files were generated for use with the Monte Carlo codes MCNP-4, MCNP-5 and MCNPX-2.6. These processed data were used for validation of calculated neutron cross sections with experimental data of which part is presented in the report.

8. RELATED OR AUXILIARY PROGRAMS - NJOY99.161

9. STATUS
NEA-1787/01: 28-MAY-2007 Screened

10. REFERENCES -
NEA-1787/01:
- M. Mattes and J. Keinert:
Present Status of Evaluated Thermal Neutron Scattering Data in the temperature
range 20 K < T < 300 K for solid and liquid moderator materials important for
design of cold neutron sources. IKE - University of Stuttgart, JEFF Meeting
November 2005.
- M. Mattes:
MAT numbers for the ENDF files and ID's for the ACE thermal files, IKE,
Universitaet Stuttgart, Germany
- M. Mattes:
Validation of the thermal neutron scattering data for polycrystalline
Aluminium, May 2006
- M. Mattes, J. Keinert:
Evaluation and Validation of Thermal Neutron Scattering Data for Liquid Natural
Argon at 87 K, IKE, Universitaet Stuttgart, November 2006
- M. Mattes:
ACE file Plots for Hydrogen in Polyethylene, IKE, Univeristaet Stuttgart,
Germany

12. PROGRAMMING LANGUAGE -NEA-1787/01:

15. NAME AND ESTABLISHMENT OF AUTHORS -
Margarete MATTES
Universitaet Stuttgart
Institut fuer Kernenergetik
und Energiesysteme
Pfaffenwaldring 31
D-70550 STUTTGART
Germany

16. MATERIAL AVAILABLE -NEA-1787/01:
Evaluations for Liquid hydrogen and deuterium for the two modifications: ortho
and para
Evaluations for H in polyethylene (CH2)
Evaluations for Liquid argon
Evaluations for Aluminium face centred cubic lattice
Documentation in PDF

17. CATEGORIES -

- Z. Data.

Keywords: COLD NEUTRON, CROSS SECTIONS, CRYOGENIC TEMPERATURES, MONTE CARLO METHOD, ULTRACOLD

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