Production and decay of K -shell hollow krypton in collisions with 52–197-MeV/u bare xenon ions

Abstract

X-ray spectra of K-shell hollow krypton atoms produced in single collisions with 52 -197 MeV/u Xe 54+ ions are measured in a heavy-ion storage ring equipped with an internal gas-jet target. Energy shifts of the 𝐾𝛼 1,2 𝑠 , 𝐾𝛼 1,2 ℎ,𝑠 , and 𝐾𝛽 1,3 𝑠 transitions are obtained. Thus, the average number of the spectator L-vacancies presented during the x-ray emission is deduced. From the relative intensities of the 𝐾𝛼 1,2 𝑠and 𝐾𝛼 1,2 ℎ,𝑠 transitions, the ratio of K-shell hollow krypton to singly K-shell ionized atoms is determined to be 14 -24%. In the considered collisions, the K-vacancies are mainly created by the direct ionization which cannot be calculated within the perturbation descriptions. The experimental results are compared with a relativistic coupled channel calculation performed within the independent particle approximation.

Progress on internal gas-jet target nuclear reaction at the HIRFL-CSR

“…兰州重离子冷却储存环HIRFL-CSR是一个开展核 物理和原子物理实验研究的高精度谱仪. 自2007年建 成以来, 被广泛应用于测量原子核质量 [25,26] 和离子-原 子分子碰撞谱学 [27] . 为拓展兰州重离子冷却储存环国 家实验室的研究领域, 中国科学院近代物理研究所自 CSRe直线段分别对称地装配着电子冷却装置 [28] 和气 体内靶系统 [29] , 通过前者提供的单能电子束可减小 [25,26] , 便于开展高电荷态离子衰变寿命的直接测 量 [30] .…”

Single and double $K$-shell vacancy production in slow Xe$^\textrm{54+,53+}$-Xe collisions

“…The development of heavy-ion synchrotrons in combination with cooler-storage rings such as the Experimental Storage Ring (ESR) at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany, now provides the capabilities to use the driver accelerator to reach the ion energy required for producing the desired charge state through traversing a stripper target, and subsequently use the storage ring to decelerate those ions to the desired low collision velocities, thus providing for the first time highly luminous cooled beams of bare and H-like heavy ions at v p v K . First experiments at storage rings with xenon as internal-target gas have been performed at collision energies down to 50 MeV/u, corresponding to v K /v p = 1.20 [24][25][26][27][28]. The experimental challenges that need to be overcome when going to even lower collision energies are discussed in this paper.…”

Quantum interference of K capture in energetic Ge31+(1s)−Schuch1, Schulz2, Kozhedub3 et al. 2020Phys. Rev. A3030View full textAdd to dashboardCite

“…At that time a proper theoretical analysis was missing and it remained unpublished. Recently, new interest in such studies arose [11][12][13][14] and a theoretical development started [15][16][17] that can be tested with the present data. A short description of the calculations will be given in Sec.…”