Measurement of the longitudinal diffusion of ionization electrons in the MicroBooNE detector

Abstract: Accurate knowledge of electron transport properties is vital to understanding the information provided by liquid argon time projection chambers (LArTPCs). Ionization electron drift-lifetime, local electric field distortions caused by positive ion accumulation, and electron diffusion can all significantly impact the measured signal waveforms. This paper presents a measurement of the effective longitudinal electron diffusion coefficient, DL, in MicroBooNE at the nominal electric field strength of 273.9 V/cm. Historically, this measurement has been made in LArTPC prototype detectors. This represents the first measurement in a large-scale (85 tonne active volume) LArTPC operating in a neutrino beam. This is the largest dataset ever used for this measurement. Using a sample of ∼70,000 through-going cosmic ray muon tracks tagged with MicroBooNE's cosmic ray tagger system, we measure DL = 3.74+0.28 -0.29 cm2/s

An exploratory comparison of e-commerce adoption in large and small enterprises

This study compares the reasons why small and large companies are adopting electronic commerce (e-commerce) and compares the benefits realized from the adoption of e-commerce by these two groups of companies. Two surveys that were undertaken contemporaneously on the use of e-commerce by small and large companies in the UK were used as the empirical basis for this study. The study found that the use of e-commerce for responding to competitors, providing enhanced customer services and improving relations with suppliers was driving the uptake by smaller businesses to a greater extent than by their larger counterparts. Only in the area of improved operational efficiency did larger businesses express greater interest in adopting e-commerce. The study also found that smaller businesses believed that they had achieved greater benefits from their e-commerce services than had the larger firms in all areas explored