sd-IBA跟sdg-IBA以及IBA-Ⅰ跟IBA-Ⅱ的关系

THE RELATION BETWEEN sd-IBA AND sdg-IBA AND THE RELATION BETWEEN IBA-Ⅰ AND IBA-Ⅱ

通常容易将sd-IBA 和sdg-IBA 的关系理解成只须将后者有关g 的项弃去就得到前者.和此类似容易认为在IBA--Ⅱ中的质子和中子的区别被忽视以后就会简化成IBA-Ⅰ.实际上这类想法是没有根据的,至多也不过是一种粗略的近似.上述各种关系应该从群表示的特点米看,sd 和sdg 理论属于不同的群链,IBA-Ⅰ和IBA-Ⅱ的关系也是如此.

It is not correct to think that sd-IBA is just the simplificationthat g-component is dropped and IBA-I is result that the difference of pand n is neglected.The correct relations should be inferred from group theory.