4π△E_β探测器的建立及其在丰中子核素研究中的应用

4π△E_β Detector and Its Application to Researching Neutron-Rich Nuclides

建立了一台４π△Ｅβ探测器，它具有很好的时间响应性能，它的上升时间为８ｎｓ．利用４π△Ｅβ－γ符合的技术使缺中子核素中来自电子俘获的γ线强度受到了很大的抑制，而对以１００％β－方式衰变的丰中子Ｈｇ同位素的γ线具有６０％的符合探测效率．将该探测器用于１８Ｏ十２０８Ｐｂ的实验中，使康普顿本底水平大大降低．

A 4π△Eβ detector has been set up. Its time response is very good and the rising time is 8ns. By using 4π△Eβ-γ coincidence technique, the γ intensity of neutron-deficient nuclides followed by electron capture is strongly suppressed, but the coincidence efficiency about γ line followed by 100% β- decay in neutron-rich Hgnuclides reaches highly 60%. The application of this detector to 18O+208Pb experiment made the Compton background descend sharply.