[领域] 近代物理 (题目相关领域) [来源] 参考书编辑为考古题 (课本习题、考古题、参考书...) [题目] Isospin is a symmetry introduced by Heisnberg to explain some properties of nuclear interactions involving proton(p), neutron(n), and pion(π). Proton is assigned to have isospin l=1/2 with the z-component l_z=1/2(i.e |1/2,1/2> or isospin up state)；neutron is assigned to the |1/2,-1/2> state. What will be the possible isospin state for deuteron? You can copy the idea for the addition of the angular momentum here to the case of isospin since they behave the same mathematically. If you know that Δ^+ is assigned to the isospin |3/2,1/2> state and Δ^+ can decay either to pπ^0 or to nπ^+ ,what will be the decay percentage for each mode assuming isospin is a good symmetry? Note that π^+ is an isospin |1,1> state , and π^0 is |1,0> state; the ladder operator for spin has the following relationship in Natural unit: S |sm>=√([s(s+1)-m(m+1) ] )|s(m-1)> [瓶颈] 对态的运算有困难 请各位帮忙 (写写自己的想法，方便大家为你解答) -- 当我说我希望保存美丽而以死亡暂停住时间，你却跟我说那是扼杀 不过看见时光的逝去比死亡更痛苦啊 这是部落格 http://0rz.tw/763xV --

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