Photoproduction of a Λ on 12C

Phys. Rev. C 58, 1551 – Published 1 September 1998
T.-S. H. Lee, Z.-Y. Ma, B. Saghai, and H. Toki


The photoproduction of a Λ on 12C is investigated by using the recently developed Saclay-Lyon amplitudes for the γpK+Λ reaction and the single-particle wave functions from a relativistic mean-field model of nuclei and Λ hypernuclei. With the nuclear transition matrix elements taken from a shell-model calculation, the predicted bound-Λ production cross sections are close to the 12C(γ,K+)Λ12B reaction data. The dependence of the predictions on the model of γpK+Λ amplitudes has been investigated. The cross sections of quasifree processes leading to an unbound Λ are also calculated in a simple three-body model. The predicted cross sections of the inclusive 12C(γ,K+) reaction reproduce the energy dependence of the data up to 1.1 GeV, but overestimate the magnitude by a factor of about 2.2. We discuss the extent to which this overestimation can be understood in terms of medium effects on the propagation of the outgoing K+ and Λ.


  • Received 3 September 1997
  • Published in the issue dated September 1998

© 1998 The American Physical Society

Authors & Affiliations

T.-S. H. Lee1,2, Z.-Y. Ma1,3, B. Saghai4, and H. Toki1

  • 1Research Center for Nuclear Physics, Osaka University, Osaka, Japan
  • 2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
  • 3China Institute of Atomic Energy, Beijing 102413, People’s Republic of China
  • 4Service de Physique Nucléaire, CEA/Saclay, F-91191 Gif-sur-Yvette, France

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