# The background simulation of experiment for searching of $2\nu2K$ capture in Xe-124

## TL;DR

This paper presents a detailed Monte Carlo simulation package for the `2K-CAPTURE' experiment in Xe-124, accurately modeling particle interactions, detector response, and electronics, validated against calibration data.

## Contribution

The paper introduces a comprehensive MC simulation tool specifically designed for the `2K-CAPTURE' setup, including detailed physics processes and electronics modeling, tuned with experimental calibration data.

## Key findings

- Simulation accurately reproduces detector energy response.
- Model accounts for photon and neutron interactions.
- Validated against calibration source data.

## Abstract

We describe the Monte Carlo (MC) simulation package of the `2K-CAPTURE' setup and discuss the agreement of its output with data. The `2K-CAPTURE' MC simulates the energy loss of particles in detector and components of the passive shield and generates the resulting response in working volume large proportional counter (LPC). The simulation accounts for absorption, reemission, and scattering of both photons and neutrons and tracks them until they either are absorbed. The algorithm proceeds with a detailed simulation of the electronics chain. The MC is tuned using data collected with radioactive calibration source deployed in the internal channel of the installation. The simulation reproduces the energy response of the detector corresponding to distribution of the generated pointwise clusters of a charge of primary ionization in LPC.