Neutron-capture cross-section measurements with high intensity pencil neutron beam

在本研究中，设计并安装了新的准直器。利用准直器，将中子束准直成直径为15mm的铅笔束。虽然光束强度下降到1/25，但信噪比提高了3倍。在^<244>Cm的第一共振峰处，得到的截面不确定度为5.8%，在^<244>Cm的第一共振峰处，得到的截面不确定度为6.6%。

In this study, new collimators were designed and installed in the ANNRI. Using the collimators, the neutron beams are collimated to pencil beam with a diameter of 15 mm. Although beam intensity dropped to 1/25, the signal-to-noise ratio increased 3 times. The uncertainties of the obtained cross sections or curium isotopes are 5.8% at the top of the first resonance of ^<244>Cm and 6.6% at that of ^<246>Cm.