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简要介绍了一种新的灵敏核探针———低能单色正电子（慢正电子）束流装置的原理及应用，同时介绍了北京慢正电子束流装置的建设进展情况
The principle and application of a new sensitive nuclear probe, a low-energy monochromatic positron (slow positron) beam-flow device, is briefly introduced. Meanwhile, the progress of the construction of the slow-positron beam-beam device in Beijing