SCREENING EFFECTS IN PAIR PRODUCTION BY 10-MEV PHOTONS ON URANIUM ATOMS

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/39299

Title:	SCREENING EFFECTS IN PAIR PRODUCTION BY 10-MEV PHOTONS ON URANIUM ATOMS
Authors:	TSENG,HK
Contributors:	物理研究所
Keywords:	ELECTRON
Date:	1994
Issue Date:	2010-07-08 14:11:19 (UTC+8)
Publisher:	中央大學
Abstract:	With a partial-wave interpolation method we calculated the positron energy spectra of pair production in the field of uranium atoms for photons of energy k = 10 MeV, permitting a comparison of theory with the recent experiment. Our results show that the atomic-electron screening effect decreases the cross section for the main region of the positron energy spectra which contributes to the total pair-production cross section, and the effect can be as large as about 9% for the region of low positron energies which contributes little to the total pair-production cross section. The screening effect to the total pair-production cross section is about 3.5%. Our results also indicate that the approximate treatment of screening through energy-shift screening theory becomes inadequate at this intermediate photon energy, while the approximate treatment of screening through form-factor screening theory is quite good. Our result for the total pair-production cross section is compared with the experimental result.
Relation:	PHYSICAL REVIEW A
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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