Speaker: Saori Pastore (Old Dominion University)
Title: Nuclear electromagnetic two-body currents
Abstract:
The nuclear electromagnetic current operator is derived in
time-ordered perturbation theory in an effective-field-theory
framework with pions, nucleons, and Delta-isobars up to one
loop corrections, {\it i.e.} up to next-to-next-to-next-to-leading
order (N$^3$LO) in the chiral expansion. The N$^2$LO current
operator is used to evaluate transition matrix elements between
wave functions derived from realistic Hamiltonians with two-
and three-body potentials. A number of electromagnetic observables
including A$=2,3$ nuclei magnetic moments and cross sections for
radiative captures of thermal neutron on deuteron and triton are
discussed.