Chapter

Chapter 4.4 Neutron techniques

Mathematical, physical and chemical tables

First Online Edition (2006)

Part 4. Production and properties of radiations

  1. I. S. Anderson1,
  2. P. J. Brown1,
  3. J. M. Carpenter2,
  4. G. Lander3,
  5. R. Pynn4,
  6. J. M. Rowe5,
  7. O. Schärpf6,
  8. V. F. Sears7,
  9. B. T. M. Willis8

Published Online: 1 JAN 2006

DOI: 10.1107/97809553602060000594

International Tables for Crystallography

International Tables for Crystallography

How to Cite

Anderson, I. S., Brown, P. J., Carpenter, J. M., Lander, G., Pynn, R., Rowe, J. M., Schärpf, O., Sears, V. F. and Willis, B. T. M. 2006. Neutron techniques. International Tables for Crystallography. C:4:4.4:430–487.

Author Information

  1. 1

    Institut Laue–Langevin, Avenue des Martyrs, BP 156X, F-38042 Grenoble CEDEX, France

  2. 2

    Intense Pulsed Neutron Source, Building 360, Argonne National Laboratory, Argonne, IL 60439, USA

  3. 3

    ITU, European Commission, Postfach 2340, D-76125 Karlsruhe, Germany

  4. 4

    LANSCE, MS H805, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545, USA

  5. 5

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA

  6. 6

    Physik-Department E13, TU München, James-Franck-Strasse 1, D-85748 Garching, Germany

  7. 7

    Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0

  8. 8

    Chemical Crystallography Laboratory, University of Oxford, 9 Parks Road, Oxford OX1 3PD, England

Publication History

  1. Published Online: 1 JAN 2006

Abstract

The first section of this chapter briefly describes the fission and spallation mechanisms for producing neutrons. The general properties of the slow neutron spectra that they produce are discussed and the methods of using beams from steady (fission reactor) sources and pulsed (accelerator-driven) sources are compared. The second section provides an overview of the different kinds of beam-definition devices. Resolution functions are then described in the third section. Scattering lengths for neutrons are tabulated in the fourth section, and scattering and absorption cross sections, isotope effects and correction for electromagnetic interactions are discussed. The fifth section gives tables of the coefficients in analytic approximations to the form factors used in the calculation of the cross sections for magnetic scattering of neutrons. The coefficients for atoms and ions in the 3d and 4d transition series are derived from wavefunctions obtained using Hartree–Fock theory and the coefficients for the rare-earth and actinide ions are obtained by fitting the analytic forms to published form factors calculated from Dirac–Fock wavefunctions. In the final section, the absorption cross sections and 1/e penetration depths of the elements are tabulated for neutrons of 1.8 Å wavelength.

Keywords:

  • absorption;
  • choppers;
  • collimation;
  • cross sections;
  • filters;
  • magnetic form factors;
  • mirrors;
  • monochromators;
  • neutron diffraction;
  • neutron scattering;
  • neutron-beam definition;
  • neutrons;
  • resolution functions;
  • scattering lengths;
  • spin-orientation devices;
  • Zeeman polarizers