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.
Highlights
A unique state is formed in the daughter atom in the case of the capture of two electrons from the K-shell
The body of the large proportional counter (LPC) is presented as a 710-mm-long copper cylinder with a working length of 595 mm and an inner diameter of 137 mm, closed on both sides with flanges, Fig.2 The following structural parts were taken into account in the internal volume of the LPC: a) the anode wire made from gold-plated tungsten with a diameter of 10 μm thick is stretched along the cylinder axis; b) the anode wire passes through the copper tubes along the edges of the detector, which in turn is inserted into the Teflon insulators
We focused on the work in which measurements were made of neutrons of different energy ranges, in the same laboratory where the installation for searching for 2K capture in 124Xe is located
Summary
A unique state is formed in the daughter atom in the case of the capture of two electrons from the K-shell. The detection of the relaxation response of atomic processes after the capture of atomic electrons in a gas medium offers several significant advantages over liquid and solid-state detectors. The search technique in our experiment is based to the registration triple coincidences of “shaked” electrons and two fluorescence photons produced in the process of filling of a double K-shell vacancy in daughter atoms. Useful events have a unique feature set in such a detector Their total signal comprises three partial pulses with known amplitudes formed as a result of absorption of two characteristic photons and a cascade of low-energy Auger electrons within the working volume. The main contribution to such events can result from the processes of double ionization of the K-shell or the emission of a low-energy gamma-quantum with simultaneous registration of the relaxation products of the daughter atomic shell
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