  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.
