Abstract
We provide an update on the development of an experiment at TUNL for determining the 1 S0 neutron-neutron (nn) scattering length (ann ) from differential cross-section measurements of three-body photodisintegration of the triton. The experiment will be conducted using a linearly polarized gamma-ray beam at the High Intensity Gamma-ray Source (HIγ S) and tritium gas contained in thin-walled cells. The main components of the planned experiment are a 230 Ci gas target system, a set of wire chambers and silicon strip detectors on each side of the beam axis, and an array of neutron detectors on each side beyond the silicon detectors. The protons emitted in the reaction are tracked in the wire chambers and their energy and position are measured in silicon strip detectors. The first iteration of the experiment will be simplified, making use of a collimator system, and silicon detectors to interrogate the main region of interest near 90° in the polar angle. Monte-Carlo simulations based on rigorous 3N calculations have been conducted to validate the sensitivity of the experimental setup to ann .
Highlights
The goal of the experiment is to determine ann to an uncertainty less than ±1 fm. This will be the first determination of this quantity using a photodisintegration reaction
The initial measurements will be carried out with a 15-MeV gamma-ray beam where the total cross section is at its maximum [1]
The measurements will be performed with sufficient accuracy to resolve discrepancies in existing three-body photodisintegration cross-section data
Summary
The goal of the experiment is to determine ann to an uncertainty less than ±1 fm. This will be the first determination of this quantity using a photodisintegration reaction.
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