Rescattering effects in the reaction γd → π^-pp

Area of Science:

• Nuclear Physics
• Particle Physics

Background:

• Deuteron photodisintegration is a fundamental process for understanding nuclear forces.
• Experimental data on the tensor analyzing power provides crucial insights into nucleon-nucleon interactions.

Purpose of the Study:

• To experimentally determine the tensor analyzing power (t20) in the deuteron photodisintegration reaction (γd → np).
• To compare experimental results with theoretical models, specifically a spectator model incorporating final-state interactions.

Main Methods:

• Data collected at the Budker Institute of Nuclear Physics using tagged photons and an internal tensor-polarized deuterium target.
• Measurement of the [Formula: see text] reaction in the photon energy range of 400–650 MeV.
• Extraction of [Formula: see text] from yield asymmetry measurements upon reversal of deuteron tensor polarization.

Main Results:

• Experimental data for the tensor analyzing power [Formula: see text] were obtained for the [Formula: see text] reaction.
• Comparison with statistical simulations showed that including final-state interactions significantly improves agreement with the experimental data.
• The results provide a stringent test for theoretical models of few-nucleon systems.

Conclusions:

• The study successfully measured the tensor analyzing power in deuteron photodisintegration.
• The importance of final-state interactions in theoretical models was confirmed.
• The findings contribute to a deeper understanding of the dynamics in the two-nucleon system.