亚势垒光裂变探测~（238）U的多峰fission势垒
Exploring the multi-humped fission barrier of 238U via sub-barrier photofission
摘要：
首次使用单色、高亮度、康普顿背散射γ射线束测量了238 U在亚势垒能量下的光裂变截面随γ射线能量的变化。实验在高强度伽马射线源（HIgS）设施中进行，束流能量在E=4.7 MeV和6.0 MeV之间，能量分辨率约为3%。在E=5.1 MeV和5.6 MeV的伽马射线束能量下，已经观察到透射共振的迹象，具有中等幅度。用EMPIRE-3.1核反应程序计算的裂变势垒参数与实验测量的光裂变截面拟合，确定了~（238）U的三峰裂变势垒参数。
英文摘要：
The photofission cross-section of 238U was measured at sub-barrier energies as a function of the gamma-ray energy using, for the first time, a monochromatic, high-brilliance, Compton-backscattered gamma-ray beam. The experiment was performed at the High Intensity gamma-ray Source (HIgS) facility at beam energies between E=4.7 MeV and 6.0 MeV and with ~3% energy resolution. Indications of transmission resonances have been observed at gamma-ray beam energies of E=5.1 MeV and 5.6 MeV with moderate amplitudes. The triple-humped fission barrier parameters of 238U have been determined by fitting EMPIRE-3.1 nuclear reaction code calculations to the experimental photofission cross section.
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