Skip to main content
Log in

New determination of the neutron-proton scattering amplitude and precise measurements of the scattering amplitudes on carbon, chlorine, fluorine and bromine

  • Published:
Zeitschrift für Physik A Atoms and Nuclei

Abstract

After an improvement on the theory of the neutron-gravity-refractometer and after refinements of the experimental procedure we have performed new measurements of the absolute value of the neutron-proton scattering amplitude at low neutron energies. In order to obtain and to confirm a very high accuracy we carried out neutron-reflection experiments on 18 various liquids of 11 different organic substances containing the elements carbon, hydrogen and/or chlorine. Compounds with fluorine and bromine were used to measure the scattering amplitudes of these elements.

We found the coherent scattering amplitudes of the bound atoms to be:a H=−3.7409(1l)fm,a c=6.6484(13)fm,a c1=9.5792(8)fm,a F=5.66(2)fm anda Br=6.79(2)fm.

The low energy (n, p)-parametersa t anda s were calculated with the presenta H and a new value of the (n, p) scattering cross-sectionσ 0.

By comparing the measureda C with values obtained from precise transmission experiments we could determine the gravitational accelerationg f of the free neutron in terms of the local value g. We found the two values to be equal:g f =0.9996(7)g.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Maier-Leibnitz, H.: Z. angew. Physik14, 738 (1962)

    Google Scholar 

  2. Koester, L.: Z. Physik182, 328 (1965)

    Google Scholar 

  3. Koester, L.: Z. Physik198, 187 (1967)

    Google Scholar 

  4. A preliminary report on this experiment was presented by L. Koester and W. Nistler. Phys. Rev. Letters27, 956 (1971)

    Google Scholar 

  5. Nücker, N.: Z. Physik227, 152 (1969)

    Google Scholar 

  6. D'Ans, Lax: Taschenbuch für Chemiker und Physiker, Bd. II. Berlin-Göttingen-Heidelberg: Springer 1964 Handbook of Chemistry and Physics, 51st Ed. 1971. The Chem. Rubber Co.

    Google Scholar 

  7. Cohen, E.R., Taylor, B.N.: Journal of Physical and Chemical Reference Data2, 663 (1973)

    Google Scholar 

  8. Houk, T.L.: Phys. Rev. C3, 1886 (1971)

    Google Scholar 

  9. Dilg, W., Vonach, H.: Z. Naturforschung26a, 442 (1971)

    Google Scholar 

  10. Wilson, R.: The Nucleon-Nucleon Interaction, Experimental and Phenomenological Aspects. New York: Interscience 1963

    Google Scholar 

  11. Dickinson, W.C., Passel, L., Halpern, O.: Phys. Rev.126, 632 (1962)

    Google Scholar 

  12. Bartolini, W., Donaldson, R.E., Passel, L.: Phys. Rev.174, 313 (1968)

    Google Scholar 

  13. Shull, C.G., Layter, J.: (1967) l.c. Acta Cryst. A25, 391 (1969)

    Google Scholar 

  14. Koester, L., Knopf, K.: Z. Naturforschung27a, 901 (1972)

    Google Scholar 

  15. Dilg, W.: to be published

  16. Lomon, E., Wilson, R.: Phys. Rev. C9, 1329 (1974)

    Google Scholar 

  17. Dabbs, J.W.T., Harvey, J.A., Paya, D., Horstmann, H.: Phys. Rev.139, B 756 (1965)

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

We wish to acknowledge helpful discussions with N. Nücker and W. D. Trüstedt. They made essential contributions to the theory and to the evaluation of the measurements. We are very thankful to Prof. H.J. Born, who gave us the opportunity to perform the important gas-chromatography in his radiochemical institute. We thank for the helpful assistance of J. Bruckmoser and the reactor staff.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Koester, L., Nistler, W. New determination of the neutron-proton scattering amplitude and precise measurements of the scattering amplitudes on carbon, chlorine, fluorine and bromine. Z Physik A 272, 189–196 (1975). https://doi.org/10.1007/BF01408146

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01408146

Keywords

Navigation