This directory contains an analysis to determine the rate of Multiple-Scatter-Single-Ionisation (MSSI) events from gamma-rays originating from detector components in the LUX-ZEPLIN experiment. MSSI events are critical to understand because they are electron-recoil (ER) events which can appear nuclear-recoil (NR) like as not all of the charge is collected. This typically occurs if the gamma-ray scatters more than once, and one of the scatters is in a region of the detector that is charge insensitive.
In this analysis, simulations are probed to determine the how many MSSI events there are from gamma simulations. Each simulation file is a radioactive decay originating from a detector component: for example, U-238 CathodeGridWires are all decays from the U-238 decay chain originating from the Cathode Grid Wires. The rate in the simulations is from Eur. Phys. J. C 80, 1044.
All of the analysis cuts can be run in three ways:
- array operations (using numpy)
- using numba.njit
- using nuba.cuda
The analysis cuts follow those detailed in Phys. Rev. Lett. 135, 011802.
This analysis has been presented at GridPP53 & SWIFT-HEP09.