Answer: Dead branches are never a good sign! However, since your tree is sending out new sprouts at the base, it means the roots are still alive. I don't know what might have killed your tree - drought, soggy soil, freezing weather? - but if the branches are dead, prune them off and cut the trunk down to ground level if it is dead, too. Then allow the sprouts to grow. One of them can become a brand new trunk. After they have grown for a season, choose the healthiest, tallest one and cut the others away. Eventually you'll have a new mimosa tree.
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