Atomic Structure Effects in Negative Meson Capture

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

“…7 of Ref. [12], where the maxima occur near the closed atomic electron shells.Similar yield patterns were observed in muonic and pionic atom X-ray yields, as well as positron-annihilation lifetimes in annealed metals [13]. Theoretical studies showed that these patterns could be related to the properties of the exotic atoms, such as the atomic radii, the initial distributions of the particles, etc.…”

“…Theoretical studies showed that these patterns could be related to the properties of the exotic atoms, such as the atomic radii, the initial distributions of the particles, etc. [13,14].Although a large amount of data on kaonic atom X-ray yields was collected, transitions with a high principal number n in materials of low atomic number Z have not previously been measured due to the low energy of the X-rays in such transitions. It is of interest to explore such unmeasured regions both experimentally and theoretically.Previous yield measurements were mainly of pure solid materials.…”

“…Theoretical studies showed that these patterns could be related to the properties of the exotic atoms, such as the atomic radii, the initial distributions of the particles, etc. [13,14].…”

Coulomb capture of muons and atomic radius

“…In particular, Wiegand and Godfrey [1], Condo [2] and Kunselman et al [3] draw the attention on kaonic x-ray yields. The latter authors also consider muon Coulomb capture ratios and muonic x-ray intensities, as do Bergmann et al [4], who state the fact appearing paradoxical from a naive point of view that a smaller radius favors the capture.…”

Measurement of the Coulomb-capture ratio of muons in binary solid solutions of metals

“…Most of the older [2][3][4][5] and more recent experiments [12][13][14][15] did not agree with the Z law. The deviations appeared to be either with no correlation to known physical facts or to show a certain periodicity [13,16,17] with Z. As a mostly fulfilled general "rule" we may state that the Z dependence is less pronounced than given by Equation (2).…”