PAIR-PRODUCTION POSITRON ENERGY-ANGLE DISTRIBUTIONS OF 5M(E)C(2) AND 10M(E)C(2) PHOTONS ON ATOMS

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39243

Title:	PAIR-PRODUCTION POSITRON ENERGY-ANGLE DISTRIBUTIONS OF 5M(E)C(2) AND 10M(E)C(2) PHOTONS ON ATOMS
Authors:	TSENG,HK
Contributors:	物理研究所
Date:	1995
Issue Date:	2010-07-08 14:09:27 (UTC+8)
Publisher:	中央大學
Abstract:	With a relativistic partial-wave method we calculated numerically the positron energy-angle distributions of pair production in the field of atoms with atomic numbers Z = 1 and 92 for photons of energies k = 5m(e)c(2) and 10m(e)c(2). We have found that in this intermediate-photon-energy region, the Born approximation works fine for low-Z elements, as expected. Our partial-wave results indicate that the Born approximation prediction for the shape of positron energy-angle distributions (especially at small positron angles) is better than its prediction for positron energy spectra of pair production in this intermediate-photon-energy region. Our results also show that the shape of positron energy-angle distributions is almost independent of atomic electron screening.
Relation:	PHYSICAL REVIEW A
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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