本题目来源于试卷: Nuclear Energy; Effects and Uses of Radiation，类别为 IB物理学
[问答题]
How can a neutron, with practically no kinetic energy, exc z5f58 dejrod :nb:va jpack+sy..lw 5s 8t+ w*ite vyg/. ,*1x syyxup7 xrozl h5:a nucleus to the extent ,xurhog:xly v15ys 7/ y zpx*.shown in (Fig. Below)?
参考答案:
First of all, the neutron can get close to the nucleus at such slow speeds due to the fact that it is neutral and will not be electrically repelled by either the electron cloud or the protons in the nucleus. Then, once it hits a nucleus, it is held due to the strong nuclear force. It adds more energy than just kinetic energy to the nucleus due to E = m$c^2$. This extra amount of mass-energy leaves the nucleus in an excited state. To decay back to a lower energy state, the nucleus will fission.
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