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Sep 24 – 29, 2023
US/Eastern timezone

Polarization Observables with a Photon Probe

Sep 26, 2023, 10:00 AM
30m
Junior Ballroom C (Durham Convention Center)

Junior Ballroom C

Durham Convention Center

Talk Spin physics in Nuclear Reactions and Nuclei Spin physics in Nuclear Reactions and Nuclei

Speaker

Dr Mark Dalton (Jefferson Lab)

Description

The polarized target program in Hall D at Jefferson Lab, which began to measure the Gerasimov-Drell-Hearn (GDH) integrand on hydrogen and deuterium, presents a unique opportunity for nuclear physics with a photon probe. The polarized target apparatus will allow polarization observables to be measured with a photon beam on polarized nuclei such as Li-7, C-13, N-15, O-17, and F-19 with photon energies up to 12 GeV. This data would allow the measurement of the GDH integrand of a nucleon in the nucleus which may allow the extraction of information on nuclear medium modifications [Bass20, Bass22]. As an inclusive measurement this would have a statistical advantage over many methods of probing nuclear modifications. It is reported that short range correlations will depolarize the paired nucleons [Thomas18] so that a change of the structure function of a high momentum, far off-mass-shell nucleon in a correlated pair, can only lead to very small EMC effect on the nuclear spin structure function. This can be tested by studying target spin asymmetries as a function of the relative momentum between two correlated nucleons, particularly in the region above the Fermi momentum.

[Bass20] https://doi.org/10.5506/APhysPolB.52.43
[Bass22] https://doi.org/10.48550/arXiv.2212.04795
[Thomas18] https://doi.org/10.1142/S0218301318400013 International Journal of Modern Physics EVol. 27, No. 12, 1840001 (2018)

Primary author

Dr Mark Dalton (Jefferson Lab)

Co-authors

Alexandre Deur (Thomas Jefferson National Accelerator Facility) Simon Sirca (U of Ljubljana)

Presentation materials