Direct nn-Scattering Measurement With the Pulsed Reactor YAGUAR

Area of Science:

• Nuclear Physics
• Particle Physics

Background:

• Direct measurement of neutron-neutron (nn) scattering is essential for resolving charge symmetry in nuclear forces.
• Historically, direct nn-scattering experiments have not been performed due to technical challenges.
• The Russian pulsed reactor YAGUAR presents a unique opportunity for such measurements.

Purpose of the Study:

• To perform the first direct measurement of neutron-neutron (nn) scattering.
• To utilize the YAGUAR reactor's capabilities for high-flux neutron generation.
• To contribute crucial data for understanding the nuclear force.

Main Methods:

• Employing the YAGUAR pulsed reactor as a high-intensity neutron source.
• Utilizing a through channel with a neutron moderator for neutron generation.
• Detecting neutrons with a specialized detector positioned 12 meters from the reactor.

Main Results:

• Preliminary experiments achieved a thermal neutron flux density of 1.1 × 10^18 /cm^2s.
• The experimental setup is established for the DIANNA Collaboration's project.
• The YAGUAR reactor demonstrates suitability for direct nn-scattering studies.

Conclusions:

• The YAGUAR reactor is the most promising neutron source for direct nn-scattering measurements.
• The DIANNA Collaboration is poised to conduct this groundbreaking experiment.
• Successful measurement will provide vital insights into nuclear force charge symmetry.