New opportunities for kaonic atoms measurements from CdZnTe detectors

TL;DR

This study demonstrates that CdZnTe detectors, with excellent energy resolution and background suppression, are promising tools for future measurements of kaonic atoms in accelerator environments.

Contribution

First implementation of CdZnTe detectors in an accelerator setting for kaonic atom research, showing high resolution and background rejection capabilities.

Findings

Achieved peak resolutions of 6% at 60 keV and 2.2% at 511 keV.

Background suppression factor of approximately 10^5-10^6.

Demonstrated suitability of CdZnTe detectors for future kaonic atom experiments.

Abstract

We present the tests performed by the SIDDHARTA-2 collaboration at the DA{\Phi}NE collider with a quasi-hemispherical CdZnTe detector. The very good room-temperature energy resolution and efficiency in a wide energy range show that this detector technology is ideal for studying radiative transitions in intermediate and heavy-mass kaonic atoms. The CdZnTe detector was installed for the first time in an accelerator environment to perform tests on the background rejection capabilities, which were achieved by exploiting the SIDDHARTA-2 Luminosity Monitor. A spectrum with an $^{241}Am$ source has been acquired, with beams circulating in the main rings, and peak resolutions of 6% at 60 keV and of 2.2% at 511 keV have been achieved. The background suppression factor, which turned out to be of the order of $\simeq10^{5-6}$, opens the possibility to plan for future kaonic atom measurements with CdZnTe detectors.