The electromagnetic polarizabilities of the nucleon are fundamental nucleon-structure observables that characterize its response to external electromagnetic fields. The neutron polarizabilities can be accessed from Compton-scattering data on light nuclear targets. Recent measurements of the differential cross section for Compton scattering on the deuteron below the pion-production threshold have decreased the uncertainties in the neutron polarizabilities, yet the proton polarizabilities remain known substantially more accurately. As the sensitivity of the cross section to the polarizabilities increases with incident photon energy, measurements above the pion threshold may offer a way for an improved determination of the neutron polarizabilities. In this Rapid Communiciation, the first measurement of the cross section for coherent Compton scattering on the deuteron above the pion-production threshold is presented.
|Journal||Physical Review C|
|State||Published - Jul 23 2018|
Bibliographical noteFunding Information:
The authors acknowledge support from the staff of the MAX IV Laboratory. The Lund Group acknowledges support from the Swedish Research Council (Contracts No. 40324901 and No. 80410001) and The Crafoord Foundation (Grant No. 20060749). The Glasgow Group acknowledges support from the Scottish Universities Physics Alliance (SUPA), the SUPA Prize Studentship, and STFC Grants No. 57071/1 and No. 50727/1. Finally, support from NSF Grant No. PHY1309130, DOE Grants No. DE–SC0016581, No. DE–SC0016583, No. DE–FG02–06ER41422 and the NFS/IRES Award No. 0553467 is acknowledged by the authors in Washington, D.C. and Massachusetts Dartmouth. The authors would like to thank H.W. Grießhammer for constructive discussions.
© 2018 American Physical Society.
ASJC Scopus subject areas
- Nuclear and High Energy Physics