LUNA核天体物理学中被积极否决的三叶草γ探测器
An actively vetoed Clover gamma-detector for nuclear astrophysics at LUNA
摘要：
在意大利Gran Sasso实验室地下深处的地下核天体物理实验室设施安装了一个Clover型抑制逃逸的复合高纯锗探测器。在LUNA的地下研究了Clover探测器的实验室伽马射线背景，为了比较，还在地上实验室进行了研究。光谱已被记录的单个段和虚拟检测器形成的在线添加的所有四个部分。还研究了逃逸抑制屏蔽的效果。尽管它们通常具有较高的本征背景，但逃逸抑制探测器被发现非常适合地下核天体物理研究。作为使用地下深处的复合探测器的优点的示例，以改进的精度确定了24 Mg（p，γ）25 Al反应中Ep = 223 keV共振的弱基态分支。
英文摘要：
An escape-suppressed, composite high-purity germanium detector of the Clover type has been installed at the Laboratory for Underground Nuclear Astrophysics (LUNA) facility, deep underground in the Gran Sasso Laboratory, Italy. The laboratory gamma-ray background of the Clover detector has been studied underground at LUNA and, for comparison, also in an overground laboratory. Spectra have been recorded both for the single segments and for the virtual detector formed by online addition of all four segments. The effect of the escape-suppression shield has been studied as well. Despite their generally higher intrinsic background, escape-suppressed detectors are found to be well suited for underground nuclear astrophysics studies. As an example for the advantage of using a composite detector deep underground, the weak ground state branching of the Ep = 223 keV resonance in the 24Mg(p,gamma)25Al reaction is determined with improved precision.
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