Measurement of Compton Scattering from the Deuteron and an Improved Extraction of the Neutron Electromagnetic Polarizabilities

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Abstract

The electromagnetic polarizabilities of the nucleon are fundamental properties that describe its response to external electric and magnetic fields. They can be extracted from Compton-scattering data - and have been, with good accuracy, in the case of the proton. In contradistinction, information for the neutron requires the use of Compton scattering from nuclear targets. Here, we report a new measurement of elastic photon scattering from deuterium using quasimonoenergetic tagged photons at the MAX IV Laboratory in Lund, Sweden. These first new data in more than a decade effectively double the world data set. Their energy range overlaps with previous experiments and extends it by 20 MeV to higher energies. An analysis using chiral effective field theory with dynamical Δ(1232) degrees of freedom shows the data are consistent with and within the world data set. After demonstrating that the fit is consistent with the Baldin sum rule, extracting values for the isoscalar nucleon polarizabilities, and combining them with a recent result for the proton, we obtain the neutron polarizabilities as αn=[11.55±1.25(stat)±0.2(BSR)±0.8(th)]×10-4 fm3 and βn=[3.651.25(stat)±0.2(BSR)0.8(th)]×10-4 fm3, with χ2=45.2 for 44 degrees of freedom.

Original languageEnglish
Article number262506
JournalPhysical Review Letters
Volume113
Issue number26
DOIs
StatePublished - Dec 31 2014

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy

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