连续束模式下β衰变研究的实验装置

A new implantation and beta detection system used in the beta-decay studies

为开展远离稳定线原子核的β衰变实验研究,我们研制了一套新的粒子注入和β探测装置.这套探测装置具有能量覆盖范围大、能量分辨好和工作稳定等特点.在束实验结果显示这套探测装置可以精确给出衰变母核和β电子之间的时间关系和位置关联信息,使我们可以在连续束工作模式下对衰变出射β电子进行准确的归属判定,大大减少了衰变谱的本底,确保了实验数据的精度,为我们在极低流强下开展衰变谱学的研究提供了一种可靠的方法.

To study the beta decay of nuclei far from the beta-stable valley, a new implantation and beta detection system has been developed at the Peking University. Working with the logarithmic MPR-16 preamplifier, this detection system covers a large energy range from keV to GeV with good energy resolution and stability. By correlating the implantation nuclei with their subsequent beta decays within the same pixel of a double-sided silicon detector （DSSD）, we can measure the decay time of the implantation nuclei with much less disturbance from the neighboring unstable nuclei and background.