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Subthreshold photofission of even-even nuclei

机译：偶数原子核的亚阈值光裂变

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Within quantum-mechanical fission theory, the angular distributions of fragments originating from the subthreshold photofission of the even-even nuclei Th-232, U-234, U-236, U-238, Pu-238, Pu-240, and Pu-242 are analyzed for photon energies below 7 MeV. Special features of various fission channels are assessed under the assumption that the fission barrier has a two-humped shape. It is shown that the maximum value of the relative orbital angular momentum L-m of fission fragments can be found upon taking into account deviations from the predictions of A. Bohr's formula for the angular distributions of fission fragments. The result is L-m approximate to 30. The existence of an "isomeric shelf" for the angular distributions of fragments from U-236 and U-238 photofission in the low-energy region is confirmed. (c) 2005 Pleiades Publishing, Inc.
机译：在量子力学裂变理论中，碎片的角分布源自Th-232，U-234，U-236，U-238，Pu-238，Pu-240和Pu-分析242中低于7 MeV的光子能量。在裂变屏障具有两峰形状的假设下评估各种裂变通道的特殊特征。结果表明，考虑到与A. Bohr公式有关裂变碎片角度分布的预测偏差，可以找到裂变碎片相对轨道角动量L-m的最大值。结果是L-m大约为30。在低能区域中，存在着一个U 236和U-238光裂变碎片角分布的“异构架”。 （c）2005年Pleiades Publishing，Inc.

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