Investigation of Nuclear Reactions Induced by High Energy Bremsstrahlung
Investigation of Nuclear Reactions Induced by High Energy Bremsstrahlung
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高能轫致辐射引起的核反应的研究
DOI：
10.1143/jpsj.19.427
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发表时间：
1964
期刊：
影响因子：
--
通讯作者：
A. Masaike
中科院分区：
文献类型：
--
作者：
A. Masaike
用活化法测量了Al 27、C12和Cu在150 ~ 720 MeV γ射线能量范围内的光反应截面。在200 ~ 400 MeV能区，Al 27（γ，π +）Mg 27，Al 27 →Na 24，Al 27 → F18和C12 → C11反应的积分截面分别为2.2×10 - 26 cm 2 ·MeV，6.2×10 - 26 cm 2 ·MeV，2.4×10 - 26 cm 2 ·MeV，和2.0×10 - 25 cm 2 ·MeV。从π介子光生、光子的非介子偶极吸收和π介子在核中的重吸收的观点来看，这些值似乎是可信的。对Al 27（γ，π +）Mg 27和Al 27 →Na 24反应的激发曲线表明，核子的（3/2，3/2）共振态对这些反应有明显的影响，但共振态的展宽可能与核子在核中的动量分布有关.
Cross sections for photo-reactions of Al 27 , C 12 and Cu were measured by the activation method in the γ-ray energy range from 150 MeV to 720 MeV. The integrated cross sections for the reactions Al 27 (γ, π + ) Mg 27 , Al 27 →Na 24 , Al 27 →F 18 , and C 12 →C 11 in the energy region between 200 MeV and 400 MeV were 2.2×10 -26 cm 2 ·MeV, 6.2×10 -26 cm 2 ·MeV, 2.4×10 -26 cm 2 ·MeV, and 2.0×10 -25 cm 2 ·MeV, respectively. These values seem to be plausible ones from the point of view of the pion photo-production, the non-mesonic dipole absorption of photons, and the reabsorption of the pion in the nucleus. The excitation curves for the reactions Al 27 (γ, π + ) Mg 27 and Al 27 →Na 24 show that the (3/2, 3/2) resonance state of a nucleon has an appreciable effect on these reactions, however, the resonances appear to be broadened probably due to the momentum distributions of nucleons in the nucleus.