  We show that the ground state of an attractive Bose gas in a double well
evolves from a coherent state to a Schrodinger Cat like state as the tunneling
barrier is decreased. The latter exhibits super- fragmentation as spin-1 Bose
gas with antiferromagnetic interaction, which is caused by the same physics. We
also show that the fragmented condensates of attractive and repulsive Bose
gases in double wells lead to very different interference patterns.
