Weeks-Chandler-Andersen chains

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The Weeks-Chandler-Andersen chain model consists of units composed of the Weeks-Chandler-Andersen reference system model, i.e. [1]:

\Phi_{\rm repulsive} (r) = \left\{ 
\Phi_{\rm LJ}(r) + \epsilon & {\rm if} \; r < 2^{1/6}\sigma \\
0 &  {\rm if} \; r \ge 2^{1/6}\sigma 
\end{array} \right.

where \Phi_{\rm LJ}(r) represents the Lennard-Jones model.