We report on an experiment conducted at the ESR storage ring aiming at the study of the X-ray emission of
Xe
54
+
ions colliding with Xe atoms at a beam energy of 50 MeV/u. The radiation resulting ...from the ion–atom interaction was observed using a high-resolution spectrometer based on metallic–magnetic calorimeter technology. In order to benchmark the capabilities of these detectors for high-precision atomic physics experiments, we identified several transitions from H-like and He-like xenon and determined their energies. Furthermore, the 1
s
-Lamb shift in
Xe
53
+
was estimated using the measured line energies. The results are compared with previous experimental studies and theoretical predictions.
Graphicalabstract
Abstract
We report on an experiment conducted at the ESR storage ring aiming at the study of the X-ray emission of
$$\text {Xe}^{54+}$$
Xe
54
+
ions colliding with Xe atoms at a beam energy of ...50 MeV/u. The radiation resulting from the ion–atom interaction was observed using a high-resolution spectrometer based on metallic–magnetic calorimeter technology. In order to benchmark the capabilities of these detectors for high-precision atomic physics experiments, we identified several transitions from H-like and He-like xenon and determined their energies. Furthermore, the 1
s
-Lamb shift in
$$\text {Xe}^{53+}$$
Xe
53
+
was estimated using the measured line energies. The results are compared with previous experimental studies and theoretical predictions.
Graphicalabstract
We present a measurement of the low-energy (0–60 keV) γ -ray spectrum produced in the α decay of 233U using a dedicated cryogenic magnetic microcalorimeter. The energya resolution of ~10 eV, together ...with exceptional gain linearity, allows us to determine the energy of the low-lying isomeric state in 229Th using four complementary evaluation schemes. The most precise scheme determines the 229Th isomer energy to be 8.10(17) eV, corresponding to 153.1(32) nm, superseding in precision previous values based on γ spectroscopy, and agreeing with a recent measurement based on internal conversion electrons. We also measure branching ratios of the relevant excited states to be b29 = 9.3 (6)% and b42 < 0.7%.
We present a measurement of the low-energy (0--60\(\,\)keV) \(\gamma\) ray spectrum produced in the \(\alpha\)-decay of \(^{233}\)U using a dedicated cryogenic magnetic micro-calorimeter. The energy ...resolution of $\sim$$10\,\(eV, together with exceptional gain linearity, allow us to measure the energy of the low-lying isomeric state in \)^{229}\(Th using four complementary evaluation schemes. The most accurate scheme determines the \)^{229}\(Th isomer energy to be \)8.10(17)\,\(eV, corresponding to 153.1(37)\)\,\(nm, superseding in precision previous values based on \)\gamma\( spectroscopy, and agreeing with a recent measurement based on internal conversion electrons. We also measure branching ratios of the relevant excited states to be \)b_{29}=9.3(6)\%\( and \)b_{42}=0.3(3)\%$.
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