Of Neutron polarizabilities and polarization observables in Compton scattering on deuteron and He-3

The HIGS upgrade program has motivated us to investigate how sensitive observables involving polarized beam and/or polarized target are to neutron polarizabilities. Thus, we calculate several polarization observables for Compton scattering on deuteron and He-3 using chiral perturbation theory ($\chi $PT) up to O(Q$^{3})$ at energies of the order of the pion mass. For deuteron we have found that the photon polarization asymmetry, $\Sigma $ is insensitive to neutron electromagnetic polarizabilities. However, one of the double polarization asymmetries, $\Sigma _{x}$ is sensitive to $\gamma _{1n}$ [1]. In the first part of the talk I will present these results. Thereafter, I will discuss the formalism for similar calculations for He-3 and report some preliminary results. \newline \newline [1] http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRVCAN000071000004044002000001\&idtype=cvips\&gifs=Yes