Isobaric Mass Quartets
In this paper we describe the current experimental status of isobaric mass quartets. A mass quartet consists of the states which represent the four projections of isospin T=3/2 on the TZ axis. Two of the states (TZ=±3/2) are mirrors of each other, and the other two are what is called analog states, in this case they are analogs of the two TZ=±3/2 levels. In Fig. 1, we show two illustrative quartets which occur in the A=9 nuclei. From this figure we can see that it is not necessary for the TZ=±3/2 levels to be ground states, and in fact it is possible to have the interesting case of many complete quartets within a given A.
KeywordsFundamental Constant Coulomb Energy Single Particle Energy Shell Model Calculation State Quartet
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