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Volumn 59, Issue 5, 1999, Pages 3527-3537

Inner-shell photoionization at relativistic energies

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Indexed keywords


EID: 0008463786     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.59.3527     Document Type: Article
Times cited : (12)

References (37)
  • 3
    • 85037249769 scopus 로고    scopus 로고
    • X-ray and Inner-shell Processes, edited by P. Lagarde, F. J. Wuilleumier, and J. P. Briand, special issue of J. Phys. (Paris) Colloq. 48, C9-48 (1987)
    • X-ray and Inner-shell Processes, edited by P. Lagarde, F. J. Wuilleumier, and J. P. Briand, special issue of J. Phys. (Paris) Colloq. 48, C9-48 (1987).
  • 4
    • 0003581579 scopus 로고    scopus 로고
    • AIP, Woodbury, NY see section written by Bernd Crasemann, p. 701
    • Atomic, Molecular and Optical Physics Handbook, edited by G. W Drake (AIP, Woodbury, NY, 1996);see section written by Bernd Crasemann, p. 701.
    • (1996) Atomic, Molecular and Optical Physics Handbook
  • 21
    • 85037183130 scopus 로고    scopus 로고
    • This assumption may seem somewhat questionable, in particular, since, as is well known, screening plays an important role in moderating pair production at high energies, that is, in preventing an unlimited logarithmic growth of the cross section with increasing photon energy, cf. Eq. (11). The fact that screening is important at high photon energies means that distances of the order of the Thomas-Fermi screening length (Formula presented) are of importance at such energies. In an attempt to improve on the distribution in direct space, the distribution in recoil momentum could be inverted. We shall not embark on such a procedure. Instead we note that if we integrate the pair creation cross section (for screened nuclei) as given by Ter-Mikaelian
    • This assumption may seem somewhat questionable, in particular, since, as is well known, screening plays an important role in moderating pair production at high energies, that is, in preventing an unlimited logarithmic growth of the cross section with increasing photon energy, cf. Eq. (11). The fact that screening is important at high photon energies means that distances of the order of the Thomas-Fermi screening length (Formula presented) are of importance at such energies. In an attempt to improve on the distribution in direct space, the distribution in recoil momentum could be inverted. We shall not embark on such a procedure. Instead we note that if we integrate the pair creation cross section (for screened nuclei) as given by Ter-Mikaelian 23 only over recoil momenta larger than (Formula presented) where (Formula presented) is the K-shell radius, then we obtain (Formula presented) and (Formula presented) at energies of (Formula presented) and (Formula presented) for impact on a lead target. So even at such high energies and for such a heavy target we expect our estimate (19) for the density factor to be good within a factor of, roughly, 2.
  • 22
    • 85037236488 scopus 로고    scopus 로고
    • H. A. Bethe and J. Ashkin, in Experimental Nuclear Physics, edited by E. Segrè (Wiley, New York, 1953), Vol. I, p. 166
    • H. A. Bethe and J. Ashkin, in Experimental Nuclear Physics, edited by E. Segrè (Wiley, New York, 1953), Vol. I, p. 166.
  • 33


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