Speaker
Tomoichi Ishiwatari
(Stefan Meyer Institut f. subat. Phys., Wien)
Description
Silicon Drift Detectors (SDDs) are X-ray detectors with the outstanding
performance for the measurement of the kaonic atom X-ray lines. The
measurement of the kaonic hydrogen/deuterium X-rays with a high
background suppression is a crucial issue, because of the small X-ray yields
(a few % in kaonic hydrogen and much smaller in kaonic deuterium) and
high background usually accompanying the available kaon beams. Large-
area SDDs are being developed for the kaonic X-ray measurements in the
SIDDHARTA experiment at LNF (Italy). The SDDs will provide an excellent
background suppression using the time correlation between the kaonic X-
rays and the back-to-back correlated K +K− pairs produced by the DAΦNE
electron-positron collider. This first application of these SDDs is an
innovation for X-ray spectroscopy in general, and for the kaonic atom X-ray
measurements in particular. The Xray energy and width of the kaonic
hydrogen Kα line will be determined most accurately, and the kaonic
deuterium Kα line will be measured for the first time. In this talk, the
experimental method to measure the kaonic X-rays with the SDDs is
presented as well as a comparison with the CCD X-ray detectors used in the
previous experiment.
Author
Tomoichi Ishiwatari
(Stefan Meyer Institut f. subat. Phys., Wien)
