First measurement of kaonic helium-4 M-series transitions

Abstract

In this paper we present the results of a new kaonic helium-4 measurement with a 1.37 g/l gaseous target by the SIDDHARTA-2 experiment at the DAΦNE collider. We measured, for the first time, the energies and yields of three transitions belonging to the Mseries. Moreover, we improved by a factor about three, the statistical precision of the 2p level energy shift and width induced by the strong interaction, obtaining the most precise measurement for gaseous kaonic helium, and measured the yield of the Lα transition at the employed density, providing a new experimental input to investigate the density dependence of kaonic atoms transitions yield.

12 pages, 5 figures, 3 tables

References in corpus (7)

• Chiral Perturbation Theory and Baryon Properties
• Precision measurement of the $3d\to 2p$ x-ray energy in kaonic ${}^4$He
• Measurements of the strong-interaction widths of the kaonic 3He and 4He 2p levels
• X-ray energies of circular transitions and electrons screening in kaonic atoms
• A new kaonic helium measurement in gas by SIDDHARTINO at the DAΦNE collider
• The SIDDHARTA-2 calibration method for high precision kaonic atoms X-ray spectroscopy measurements
• Measurements of high-n transitions in intermediate mass kaonic atoms by SIDDHARTA-2 at DA$\mathrm{\Phi }$NE