Elsevier

Physics Letters B

Volume 389, Issue 3, 19 December 1996, Pages 470-474
Physics Letters B

The mass-dependence of meson-exchange currents in the reaction (γ,p)

https://doi.org/10.1016/S0370-2693(96)01298-1Get rights and content

Abstract

A systematic study of the mass dependence of meson-exchange currents in the reaction (γ,p) has been carried out. This study became possible with the availability of new high resolution (γ,p) data from 12C to 208Pb. In order to determine the relative importance of meson-exchange currents the direct knockout part of the (γ,p) cross section has been constrained by results obtained with the (e,e′p) reaction in similar momentum ranges. It is found that the enhancement of the (γ,p) cross section due to meson-exchange currents reduces by a factor three in going from 12C to 208Pb. This effect is tentatively attributed to the increased importance of higher multipolarities in the description of the coupling to meson exchange currents in heavy nuclei.

References (24)

  • M. Gari et al.

    Phys. Rep.

    (1981)
    H. Hebach et al.

    Nucl. Phys. A

    (1976)
    H. Göringer et al.

    Phys. Lett. B

    (1980)
    H. Göringer et al.

    Nucl. Phys. A

    (1982)
  • M. Cavinato et al.

    Nucl. Phys. A

    (1982)
    M. Cavinato et al.

    Nuovo Cimento A

    (1983)
    M. Cavinato et al.

    Nucl. Phys. A

    (1984)
  • J. Ryckebusch

    Nucl. Phys. A

    (1988)
  • D.J.S. Findlay et al.

    Nucl. Phys. A

    (1977)
    D.J.S. Findlay

    Phys. Lett. B

    (1978)
    M.J. Leitch

    Phys. Rev. C

    (1985)
    J.L. MatthewsJ.P. McDermott

    Phys. Rev. Lett.

    (1988)
    B. Hoïstad

    Phys. Lett. B

    (1992)
    G.M. Lotz et al.

    Nucl. Phys. A

    (1992)
    T.B. Bright et al.

    Phys. Rev. C

    (1994)
  • S. Boffi et al.

    Nucl. Phys. A

    (1981)
  • J. Ryckebusch

    Phys. Rev. C

    (1992)
  • D.G. Ireland et al.

    Phys. Rev. C

    (1994)
  • I. Bobeldijk

    Phys. Lett. B

    (1995)
  • E.C. Aschenauer

    Nucl. Phys. A

    (1996)
  • G. van der Steenhoven

    Nucl. Phys. A

    (1988)
    G. van der Steenhoven

    Nucl. Phys. A

    (1988)
  • G.J. Kramer

    Phys. Lett. B

    (1989)
    G.J. Kramer
  • V. Van der Sluys
  • Cited by (10)

    View all citing articles on Scopus

    The financial support by the Swedish Natural Science Research Council is gratefully acknowledged by the Swedish part of the collaboration, as well as the support by the Knut and Alice Wallenberg Foundation, the Crafoord Foundation, the Swedish Institute, and the contribution from the Royal Swedish Academy of Sciences. The work is also supported by the European-Union Directorate General for Science “Human Capital & Mobility” Program under contract ERBCHRXCT930111.

    View full text