Figure 2. False color image of SPINS neutron scattering data [ 2 ] from Cu ( C sub 4 H sub 4 N sub 2 ) ( N O sub 3 ) 2 ( CuPzN ) in zero and high field. Spin-1/2 copper atoms shown in red form uniform chains. The experiment provides evidence for a two-particle continuum from spin-1/2 particles with a field dependent chemical potential. The solid lines show boundaries for various types of continua determined through Bethe Ansatz and exact diagonalization.

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