| 用低能弱γ源测量电子对的近阈产生截面 |
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| 引用本文： | 林翔鸿,卞祖和,唐孝威.用低能弱γ源测量电子对的近阈产生截面[J].物理学报,1989,38(7):1369-1374. |
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| 作者姓名： | 林翔鸿 卞祖和 唐孝威 |
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| 作者单位： | 中国科学技术大学近代物理系 |
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| 摘 要： | 用2.7μCi的60Co弱γ源和NaI(Tl)与Ge(Li)双探测器符合测量方法,测量了Al,Zn,Sn,Pb四种样品的电子对产生绝对截面。测量结果与前人用很强γ源得到的结果相符合,并验证了在近阈条件下,对产生截面满足Jaeger关系式:σpair=(Z2+aZ4)σ0,求得对60Co源γ光子,α=(1.51±0.23)×10-4,σ0关键词：
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| 收稿时间： | 1988-11-07 |
MEASUREMENTS OF THE CROSS SECTION OF ELECTRON PAIR PRODUCTION NEAR THRESHOLD USING A LOW INTENSITY 60Co γ RAY SOURCE |
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| LIN XIANG-HONG,BIAN ZU-HE and TANG XIAO-WEI.MEASUREMENTS OF THE CROSS SECTION OF ELECTRON PAIR PRODUCTION NEAR THRESHOLD USING A LOW INTENSITY 60Co γ RAY SOURCE[J].Acta Physica Sinica,1989,38(7):1369-1374. |
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| Authors: | LIN XIANG-HONG BIAN ZU-HE and TANG XIAO-WEI |
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| Abstract: | The absolute cross sections of electron pair production in Al, Zn, Sn and Pb have been measured using a 2.7 μCi 60Co γ-ray source and two detectors (Ge(Li) and Nal(Tl)) in coincidence. The results are in good agreement with published works using high intensity γ-ray source. The measurements prove that the Z-dependence of the cross section near threshold satisfies the equation σpair= (Z2 +αZ4)σ0 of Jaeger. We also obtained α=(1.51±0.23)×10-4,σ0=(1.95±0.11)×10-2mb for 60Co γ-rays. |
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