Basic non-linear effects in silicon radiation detector in detection of highly ionizing particles: registration of ultra rare events of superheavy nuclei in the long-term experiments

TL;DR

This paper investigates non-linear effects in silicon radiation detectors used for detecting highly ionizing particles, proposing models and simulations to improve the detection of ultra-rare superheavy nuclei events in long-term experiments.

Contribution

It introduces an analytical formula for pulse-height defect calculation and a simulation code for spectral analysis, enhancing detection accuracy in superheavy element research.

Findings

The analytical model accurately predicts pulse-height defects.

Simulation results agree with experimental spectra across multiple facilities.

Application of real-time algorithms improves background suppression in long-term experiments.

Abstract

Sources of non-linear response of PIPS detector, when detecting highly ionizing particles like recoils (EVR), fission fragments and heavy ions, including formation of large pulse-height defect (PHD) are considered. An analytical formula to calculate the recombination component of EVR PHD is proposed on the base of surface recombination model with some empirical correction. PC-based simulation code for generating the spectrum of the measured recoil signal amplitudes of the heavy implanted nuclei is presented. The simulated spectra are compared with the experimental ones for the different facilities: the Dubna Gas Filled Recoil Separator (DGFRS), SHIP and RIKEN gas-filled separator. After the short reviewing of the detection system of the DGFRS, is considered the real-time matrix algorithm application aimed to the radical background suppression in the complete-fusion heavy-ion induced nuclear reactions. Typical examples of application in the long term experiments aimed to the synthesis of superheavy elements Z=112-118 are presented [1-9].