Constrained variational results for the new Bethe homework problem

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Abstract
Bethe (1973) has proposed two model N-N interactions, one containing a central plus sigma 1. sigma 2 spin dependence and the other containing in addition a tensor force to study the convergence of various many-body techniques for calculating the bulk properties of many fermion fluids. Following the success of the authors' constrained variational calculations in describing the behaviour of the original Bethe homework problem involving a purely central interaction, they now present their results in neutron matter and nuclear matter for the new spin-dependent potentials.