  For a diblock copolymer with total chain length $\gamma>0$ and mass ratio
$m\in(-1,1)$, we consider the problem of minimizing the doubly nonlocal free
energy $$ \mathcal{E}_{\varepsilon}(u) =\mathcal{H}(u)
+\frac{1}{\varepsilon^{2s}}
  \int_{\Omega}W(u)\,dx +\frac{1}{2}\int_{\Omega}
  \left|(-\gamma^{2}\Delta)^{-\frac{1}{2}}(u-m)\right|^2\,dx $$ in a domain
$\Omega$, where $\mathcal{H}(u)$ is a fractional $H^s$-norm with
$s\in(0,\frac12)$, and $W$ is a double-well potential. This arises in the study
of micro-phase separation phenomena for diblock copolymers with nonlocal
diffusions.
  On the unit interval, we identify the $\Gamma$-limit as $\varepsilon\to0^+$,
and also find explicit isolated local minimizers associated the lamellar
morphology phase in the case $m=0$, provided that the chain is sufficiently
short or the nonlocal interaction is sufficiently strong (i.e. as $s\to0^+$).
We stress that such extra condition is new for the nonlocal case and is not
present in the classical model. The proof, while elementary, requires a careful
analysis of the nonlocal integrals.
