- Access by Xinjiang University
Transmission of Slow Neutrons by Liquid Helium
Phys. Rev. 97, 855 – Published 15 February, 1955
DOI: https://doi.org/10.1103/PhysRev.97.855
Abstract
We have determined the total scattering cross section of liquid helium for neutrons of wavelengths between 3 and 16 angstroms and at six helium temperatures between 1.25 and 4.6°K. The neutrons were obtained from the thermal beam of a reactor and were monochromatized by a low resolution velocity selector. The total scattering cross section decreases with temperature at all wavelengths studied. At the shortest wavelengths the cross section approximates the free atom value; it exhibits a rapid drop with increasing wavelength. For the 4.6° liquid it passes through a shallow minimum at about 10 A. At lower helium temperatures, the fall from the free atom cross section is steeper; the existence of a minimum has not been established. The results are discussed qualitatively on the basis of several models of liquid helium. The only one predicting the overall features of the change of cross section with wavelength and temperature is the solid model.
References (26)
- W. H. Keesom, Helium (Elsevier, Amsterdam, 1942)
- E. A. Long and L. Meyer, Phil. Mag. Supplement 2, 1 (1953)
- K. R. Atkins, Phil. Mag. Supplement 1, 169 (1952)
- F. Zernike and J. A. Prins, Z. Physik. 41, 184 (1927)
- N. S. Gingrich, Revs. Modern Phys. 15, 90 (1943)
- L. Goldstein, Phys. Rev. 83, 289 and 84, 466 (1951)
- G. Placzek, Phys. Rev. 86, 377 (1952)
- W. H. Keesom and K. W. Taconis, Physica 5, 270 (1938) J. Reekie, Proc. Cambridge Phil. Soc. 36, 236 (1940)
- J. Reekie and T. S. Hutchison, Phys. Rev. 92, 827 (1953) Hutchison, Beaumont, and Reekie, Proc. Phys. Soc. (London) A66, 409 (1953)
- Goldstein, Sommers, King, and Hoffman, in Proceedings of the International Conference of Low Temperature Physics, edited by R. Bowers (Oxford, 1951), pp. 88-89
- D. G. Henshaw and D. G. Hurst, Phys. Rev. 91, 1222 (1953)
- H. London and P. A. Egelstaff, Communication at the Third International Conference of Low Temperature Physics and Chemistry, Houston, December 1953 (unpublished)
- L. Goldstein and H. S. Sommers, Jr. (to be published)
- L. D. P. King, Los Alamos Report LA-1301 (1952) (unpublished)
- J. G. Dash and H. S. Sommers, Jr., Rev. Sci. Instr. 24, 91 (1953)
- Hamermesh, Ringo, and Wexler, Phys. Rev. 90, 603 (1953) Carter, Palevsky, Myers, and Hughes, 92, 716 (1953)
Omitted endnote
- H. van Dijk and D. Shoenberg, Nature 164, 151 (1949)
- J. G. Daunt, Advances in Phys. 1, 209 (1952)
- Soller, Fairbank, and Crowell, Phys. Rev. 91, 1058 (1953)
- L. D. P. King and L. Goldstein, Phys. Rev. 75, 1366 (1949)
- Bashkin, Petree, Mooring, and Peterson, Phys. Rev. 77, 748 (1950)
- A. W. McReynolds, Phys. Rev. 84, 969 (1951)
- L. Goldstein and D. Sweeney, Phys. Rev. 80, 141 (1950)
- Goldstein, Sweeney, and Goldstein, Phys. Rev. 77, 319 (1950)
- A. Akhieser and I. Pomeranchuk, J. Phys. (U.S.S.R.) 9, 461 (1945)