We calculate the electromagnetic properties of the deformed one-neutron halo candidate $^{ 31}$Ne using Halo Effective Field Theory (Halo EFT). In this framework, $^{ 31}$Ne is bound via a resonant $P$-wave interaction between the $^{ 30}$Ne core and the valence neutron. We set up a spherical formalism for $^{ 31}$Ne in order to calculate the electromagnetic form factors and the E1-breakup strength distribution into the $^{ 30}$Ne-neutron continuum at leading order in Halo EFT. The associated uncertainties are estimated according to our power counting. In particular, we assume that the deformation of the $^{ 30}$Ne core enters at next-to-leading order. It can be accounted for by including the $J^P=2^+$ excited state of $^{ 30}$Ne as an explicit field in the effective Lagrangian.
Categories: nucl-th