X-ray transition yields of low-Z kaonic atoms produced in Kapton

Abstract

The X-ray transition yields of kaonic atoms produced in Kapton polyimide (C(22)HiON(2)O(5)) were measured for the first time in the SIDDHARTA experiment. X-ray yields of the kaonic atoms with low atomic numbers (Z = 6,7, and 8) and transitions with high principal quantum numbers (n = 5-8) were determined. The relative yields of the successive transitions in the same atoms and the yield ratios of carbon-to-nitrogen (C:N) and carbon-to-oxygen (C:O) for the same transitions were also determined. These X-ray yields provide important information for understanding the capture ratios and cascade mechanisms of kaonic atoms produced in a compound material, such as Kapto

Kaonic Atoms --- Results of the SIDDHARTA Experiment

“…Figure 5 shows the energy spectrum taken with the deuterium gas. Compared to Monte Carlo simulations, the absolute X-ray yields of kaonic atoms produced in Kapton were determined for the first time [8]. Table II shows the absolute X-ray yield Y of the kaonic atoms produced in Kapton.…”

“…Also, the shifts and widths of kaonic helium isotopes (3 and 4) were determined [4][5][6][7]. In addition to the measurements with gaseous targets, kaonic atom X-rays produced in the target wall made of Kapton were measured [8]. In this article, the results reported above are briefly summarized.…”

The yield of kaonic hydrogen X-rays in the SIDDHARTA experiment

“…We therefore introduced the 50 µm Mylar uncertainty as one source for the systematic error in the simulation, and found it to be the most dominant one followed by the uncertainties in the gas density and the beam momenta, which are also the main systematic errors to the absolute yields. Further discussions about our Monte Carlo simulation can be found in reference [6].…”

New precision era of experiments on strong interaction with strangeness at DAFNE/LNF-INFN

“…X-ray signals from EPJ Web of Conferences 05016-p.2 kaonic hydrogen are seen as bumps around the 6-10 keV region. In addition to the kaonic hydrogen X-rays, several peaks were observed, which were produced in the target window material made of Kapton [1,10]. Since Kapton contains carbon, nitrogen, oxygen, X-ray transitions from kaonic carbon (K − C), nitrogen (K − N) and oxygen (K − O) were observed [10].…”

“…In addition to the kaonic hydrogen X-rays, several peaks were observed, which were produced in the target window material made of Kapton [1,10]. Since Kapton contains carbon, nitrogen, oxygen, X-ray transitions from kaonic carbon (K − C), nitrogen (K − N) and oxygen (K − O) were observed [10]. Figure 1(a) shows the energy spectrum of kaonic hydrogen after subtracting the X-ray lines from Kapton and the continuous background.…”