在活化法测量中子能谱、中子温度等工作中,经常要用~(55)Mn。这是因为锰的热截面较大又具有1/V性质,共振能量为几百eV,丰度为100％。但~(55)Mn共振自屏因子到目前为止,说法不一,有的认为接近于1,有的认为比1小。认为比1小的作者居多,但他们彼此计算的结果也很不一致,为此我们较系统地做了测 In the activation method to measure neutron energy spectrum, neutron temperature and other work, often use ~ (55) Mn. This is because manganese has a large thermal cross-section with 1 / V properties, a resonant energy of several hundred eV and an abundance of 100%. However, ~ (55) Mn resonant self-screen factor so far, different opinions, and some think close to 1, while others think that a smaller than 1. Most authors consider it to be smaller than 1, but their results calculated by each other are also very different. Therefore, we systematically measured