  We exploit the separation of scales in weakly-bound nuclei to compute E2
transitions and electric form factors in a Halo EFT framework. The relevant
degrees of freedom are the core and the halo neutron. The EFT expansion is
carried out in powers of $R_{core}/R_{halo}$, where $R_{core}$ and $R_{halo}$
denote the length scales of the core and halo, respectively. We include the
strong $s$-wave and $d$-wave interactions by introducing dimer fields. The
dimer propagators are regulated by employing the power divergence subtraction
scheme and matched to the effective range expansion in the respective
channel.Electromagnetic interactions are included via minimal substitution in
the Lagrangian. We demonstrate that, depending on the observable and respective
partial wave, additional local gauge-invariant operators contribute in LO, NLO
and higher orders.
