EXILL-a high-efficiency, high-resolution setup for ?-spectroscopy at an intense cold neutron beam facility
EXILL-a high-efficiency, high-resolution setup for ?-spectroscopy at an intense cold neutron beam facility
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EXILL - 强冷中子束设施中用于 β 能谱分析的高效、高分辨率装置
DOI：
10.1088/1748-0221/12/11/p11003
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发表时间：
2017
影响因子：
1.3
通讯作者：
Jentschel M
中科院分区：
文献类型：
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作者：
Jentschel M
在EXILL活动中，在劳厄-朗之万研究所的冷中子束设施PF 1B上运行了一个高效的高纯锗探测器阵列，通过测量中子诱导俘获和裂变反应后的γ射线来进行核结构研究。该装置由一个准直系统组成，该系统产生的笔形束在靶位置的热俘获等效通量约为10 8 ns− 1 cm− 2，中子晕可忽略不计。目标周围有8到10个反康普顿屏蔽EXOGAM三叶草探测器、4到6个反康普顿屏蔽大型同轴GASP探测器和2个标准三叶草探测器。在活动的一部分，该阵列与来自法蒂玛合作的16个LaBr 3：（Ce）探测器相结合。探测器排列成菱形立方八面体阵列，提供了进行非常精确的角度相关和方向偏振相关测量的可能性。该系统的信号采集速率可达6× 105 Hz。这些数据允许设置多重巧合，以获得衰减方案，并与LaBr 3：（Ce）探测器的法蒂玛阵列相结合，以分析在皮秒至微秒范围内的激发能级的半衰期。使用133 Ba、60 Co和152 Eu的标准校准源以及来自能量范围从30 keV到10 MeV的27 Al（n，γ）28 Al和35 Cl（n，γ）36 Cl反应的数据，对EXILL进行了精确的能量和效率校准。
In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of γ-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10 8 ns− 1 cm− 2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr 3:(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6× 10 5 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr 3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133 Ba, 60 Co and 152 Eu as well as data from the reactions 27 Al (n, γ) 28 Al and 35 Cl (n, γ) 36 Cl in the energy range from 30 keV up to 10 MeV.