# aCORN: an experiment to measure the electron-antineutrino correlation coefficient in free neutron decay

## TL;DR

This paper presents a novel experimental apparatus for measuring the electron-antineutrino correlation coefficient in free neutron decay by converting angular correlation into a proton time-of-flight asymmetry, simplifying detection.

## Contribution

The paper introduces a new measurement technique that avoids proton spectroscopy by converting angular correlation into a time-of-flight asymmetry, enhancing precision.

## Key findings

- Successful implementation of the apparatus
- First measurement of the correlation coefficient using this method
- Analysis of systematic effects and uncertainties

## Abstract

We describe an apparatus used to measure the electron-antineutrino angular correlation coefficient in free neutron decay. The apparatus employs a novel measurement technique in which the angular correlation is converted into a proton time-of-flight asymmetry that is counted directly, avoiding the need for proton spectroscopy. Details of the method, apparatus, detectors, data acquisition, and data reduction scheme are presented, along with a discussion of the important systematic effects.