Commissioning of a mobile neutron spectrometer for LNGS
University of L’Aquila(拉奎拉大学);INFN, Laboratori Nazionali del Gran Sasso(意大利国家核物理研究所,格兰萨索国家实验室);Karlsruhe Institute of Technology(卡尔斯鲁厄理工学院);Heidelberg University(海德堡大学)
Francesco Pompa, Klaus Eitel, Alfredo Davide Ferella, Felix Kratzmeier, Melih Solmaz, Kathrin Valerius
环境中的中子是地下实验室中稀有事件搜索的背景源。由于大部分中子背景来自 cavern 墙,这是由于混凝土和岩石的固有放射性,中子通量是时间和位置依赖的。因此,需要精确了解谱和总通量,以设计屏蔽和 veto 机制。这里介绍了 ALMOND(An LNGS Mobile Neutron Detector)。它是一种便携式中子谱仪,基于捕获门控光谱学,由塑料闪烁体条阵列包裹着 Gadolinium 薄膜组成。该探测器已使用 Americium-Beryllium 源在卡尔斯鲁厄理工学院和 Americium-Boron 源和 D-D 生成器在 ENEA Frascati 进行校准。这里展示了中子校准结果,包括时间飞行法和 D-D 生成器的结果,以及捕获时间剖面的初步结果。此外,还展示了在 LNGS Hall A 进行的中子背景运行的初步结果。
英文摘要:
Environmental neutrons are a source of background for rare event searches in underground laboratories. Since the majority of the neutron background comes from the cavern walls due to the intrinsic radioactivity of concrete and rock, the flux is known to be time and location dependent. Therefore, a precise knowledge of the spectrum and of the total flux is needed to devise shielding and veto mechanisms for rare event searches. Here ALMOND (An LNGS Mobile Neutron Detector) is presented. It is a mobile neutron spectrometer, based on capture-gated spectroscopy and comprised of an array of plastic scintillator bars wrapped with gadolinium foils. The detector has been calibrated with Americium-Beryllium source at Karlsruhe Institute of Technology and with an Americium-Boron source and a D-D generator at ENEA Frascati. The results of the neutron calibration with the time of flight method and the D-D generator are shown here, alongside the first results on capture time profile. Moreover, the first results from the neutron background run in Hall A at LNGS are presented.
An LNGS Mobile Neutron Detector (ALMOND): Mapping Ambient Neutron Background of Gran Sasso National Laboratory
Heidelberg University(海德堡大学);Karlsruhe Institute of Technology(卡尔斯鲁厄理工学院);University of L’Aquila(拉奎拉大学);INFN, Laboratori Nazionali del Gran Sasso(意大利国家核物理研究所,格兰萨索国家实验室)
A pulsed, mono-energetic and angular-selective UV photo-electron source for the commissioning of the KATRIN experiment
KATRIN实验的目标是以200 meV/c^2(90% C. L.)的灵敏度确定中微子质量尺度。通过精确测量氚$β$ -光谱在端点区域的形状。衰变电子的能量分析是通过MAC-E滤波谱仪实现的。为了确定KATRIN主谱仪的透射特性,研制了一种单能角选择电子源。在准备主光谱仪的第二次调试阶段时,在KATRIN监测光谱仪上进行了测量阶段,其中设备在MAC-E过滤器设置中运行以进行测试。这些测量的结果进行了比较,使用粒子跟踪软件“Kassiopeia”,这是在KATRIN合作开发的模拟在最近几年。
Neutron EDM Experiment with an Advanced Ultracold Neutron Source at TRIUMF
Kyoto University(京都大学);Research Center for Nuclear Physics, the University of Osaka(大阪大学核物理研究中心);The University of Manitoba(曼尼托巴大学);TRIUMF(特利昂姆夫国家粒子加速器中心);Instituto de Física, Universidad Nacional Autónoma de México(墨西哥国立自治大学物理研究所);The University of Saskatchewan(萨斯喀彻温大学);Simon Fraser University(西蒙菲莎大学);The University of Winnipeg(温尼伯大学)