Recent Deuteron Compton Scattering Results and Extracted Neutron Polarizabilities

Abstract

Abstract. The COMPTON@MAX-lab collaboration has recently published a new measurement of elastic photon scattering from deuterium using tagged photons at the MAX IV Laboratory [1]. The experiment utilized the Tagged Photon Facility at MAX IV and three of the largest NaI(Tl) detectors in the world. Correction terms to the cross section were determined via Monte Carlo simulations [2,3] and were confirmed by comparisons to the well-known 12 C(γ,γ) 12 C reaction [4]. These results represent the most extensive data on deuteron Compton scattering ever measured and effectively double the world data set. In addition, the energy range overlaps previous experiments and extends nearly 20 MeV higher where the sensitivity to the polarizabilities is enhanced. As a result, we have obtained the neutron polarizabilities as α n =[11.55 ± 1.25(stat) ± 0.2(BSR) ± 0.8(th)] × 10 −4 fm 3 and β n =[3.65 ∓ 1.25(stat) ± 0.2(BSR) ± 0.8(th)] × 10 −4 fm 3 , which represents a 30% reduction in the statistical uncertainty.