The Gas Amplifier Detector with Germanium Tagging (GADGET) is a new detection system devoted to the measurement of weak, low-energy β-delayed proton decays relevant for nuclear astrophysics studies. It is comprised of a new gaseous Proton Detector equipped with a Micromegas readout for charged particle detection, surrounded by the existing Segmented Germanium Array (SeGA) for the high-resolution detection of the prompt γ-rays. In this work we describe in detail for the first time the design, construction, and operation of the GADGET system, including performance of the Proton Detector. We present the results of a recent commissioning experiment performed with \textsuperscript{25}Si beam at the National Superconducting Cyclotron Laboratory (NSCL). GADGET provided low-background, low-energy β-delayed proton detection with efficiency above 95\%, and relatively good efficiency for proton-gamma coincidences (2.7\% at 1.37 MeV).
@article{arxiv.1903.07457,
title = {GADGET: A Gas Amplifier Detector with Germanium Tagging},
author = {Moshe Friedman and David Pérez-Loureiro and Tamas Budner and Emanuel Pollacco and Chris Wrede and Marco Cortesi and Cathleen Fry and Brent Glassman and Madison Harris and Joe Heideman and Molly Janasik and Brian T Roeder and Michael Roosa and Antti Saastamoinen and Jordan Stomps and Jason Surbrook and Pranjal Tiwari and John Yurkon},
journal= {arXiv preprint arXiv:1903.07457},
year = {2019}
}