Gianluca Janka
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View article: Microwave Spectroscopy of the Muonium $2S_{1/2}-2P_{3/2}$ Fine Structure Interval
Microwave Spectroscopy of the Muonium $2S_{1/2}-2P_{3/2}$ Fine Structure Interval Open
We report a microwave spectroscopy measurement of the muonium $2S_{1/2}-2P_{3/2}$ fine structure transition, yielding a transition frequency of $9871.0 \pm 7.0~\mathrm{MHz}$, in agreement with state-of-the-art QED predictions within one st…
View article: Monitoring the tagging efficiency of the low-energy muon beamline through background analysis: Insights into the long-term performance of ultrathin carbon foils
Monitoring the tagging efficiency of the low-energy muon beamline through background analysis: Insights into the long-term performance of ultrathin carbon foils Open
The efficient tagging of individual muons, along with the stability of the involved ultrathin carbon foil, is critical for ensuring fast, reliable, and reproducible low-energy muon spin rotation measurements. At the Paul Scherrer Institute…
View article: Pressure induced transition from chiral charge order to time-reversal symmetry-breaking superconducting state in Nb-doped CsV3Sb5
Pressure induced transition from chiral charge order to time-reversal symmetry-breaking superconducting state in Nb-doped CsV3Sb5 Open
View article: Drift time calibration of the ultra-low material budget GEM-based TPC for MIXE
Drift time calibration of the ultra-low material budget GEM-based TPC for MIXE Open
Muon-Induced X-ray Emission (MIXE) is a non-destructive analytical technique that leverages negative muons to probe elemental and isotopic compositions by detecting characteristic muonic X-rays emitted during atomic cascades and gamma rays…
View article: The ultra-low material budget GEM-based TPC for tracking with VMM3a readout
The ultra-low material budget GEM-based TPC for tracking with VMM3a readout Open
The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations in different facilities to study its tracking performance. The most at…
View article: Magnetic Precursor to the Structural Phase Transition in V<sub>2</sub>O<sub>3</sub>
Magnetic Precursor to the Structural Phase Transition in V<sub>2</sub>O<sub>3</sub> Open
The coupling between structural, electronic and magnetic degrees of freedom across the metal‐insulator transition in V 2 O 3 makes it hard to determine the main driving mechanism behind the transition. Specifically, the role of magnetism i…
View article: Towards Lamb shift spectroscopy of antihydrogen atoms at the GBAR $\mathrm{\bar{H}}$ beam line
Towards Lamb shift spectroscopy of antihydrogen atoms at the GBAR $\mathrm{\bar{H}}$ beam line Open
A microwave (MW) spectroscopy experiment has been proposed to directly measure the resonant frequency of 2S1/2 − 2P1/2 Lamb shift transition in antihydrogen (H_) atoms. The spectroscopy op…
View article: Muonium fine structure: theory update, tests of Lorentz violation, and experimental prospects
Muonium fine structure: theory update, tests of Lorentz violation, and experimental prospects Open
View article: Monitoring the tagging efficiency of the Low-Energy Muon beamline through background analysis: Insights into the long-term performance of ultrathin carbon foils
Monitoring the tagging efficiency of the Low-Energy Muon beamline through background analysis: Insights into the long-term performance of ultrathin carbon foils Open
The efficient tagging of individual muons, along with the stability of the involved ultrathin carbon foil, is critical for ensuring fast, reliable and reproducible low-energy muon spin rotation (LE-$\mathrmμ$SR) measurements. At the Paul S…
View article: Drift time calibration of the ultra-low material budget GEM-based TPC for MIXE
Drift time calibration of the ultra-low material budget GEM-based TPC for MIXE Open
Muon-Induced X-ray Emission (MIXE) is a non-destructive analytical technique that leverages negative muons to probe elemental and isotopic compositions by detecting characteristic muonic X-rays emitted during atomic cascades and gamma rays…
View article: The Ultra-Low material budget GEM based TPC for tracking with VMM3a readout
The Ultra-Low material budget GEM based TPC for tracking with VMM3a readout Open
The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations in different facilities to study its tracking performance. The most at…
View article: Muonium fine structure: theory update, tests of Lorentz violation and experimental prospects
Muonium fine structure: theory update, tests of Lorentz violation and experimental prospects Open
We review the status of the QED calculations for the muonium $2S_{1/2}-2P_{3/2}$ energy interval and provide the updated theoretical value of $9874.357\pm0.001\,\mathrm{MHz}$. Additionally, we present a model for probing Lorentz-violating …
View article: Overcoming the probing-depth dilemma in spectroscopic analyses of batteries with muon-induced X-ray emission (MIXE)
Overcoming the probing-depth dilemma in spectroscopic analyses of batteries with muon-induced X-ray emission (MIXE) Open
An introductory guide to muon-induced X-ray emission (MIXE) for the battery community, highlighting both the potential and limitations of this novel characterization technique with extended probing depth.
View article: Pressure induced transition from chiral charge order to time-reversal symmetry-breaking superconducting state in Nb-doped CsV$_3$Sb$_5$
Pressure induced transition from chiral charge order to time-reversal symmetry-breaking superconducting state in Nb-doped CsV$_3$Sb$_5$ Open
The experimental realisation of unconventional superconductivity and charge order in kagome systems \textit{A}V$_3$Sb$_5$ is of critical importance. We conducted a highly systematic study of Cs(V$_{1-x}$Nb$_x$)$_3$Sb$_5$ with $x$=0.07 (Nb$…
View article: Magnetic precursor to the structural phase transition in V$_2$O$_3$
Magnetic precursor to the structural phase transition in V$_2$O$_3$ Open
The coupling between structural, electronic and magnetic degrees of freedom across the metal-insulator transition in V2O3 makes it hard to determine the main driving mechanism behind the transition. Specifically, the role of magnetism has …
View article: Improving the beam quality of the low-energy muon beamline at Paul Scherrer Institute: Characterization of ultrathin carbon foils
Improving the beam quality of the low-energy muon beamline at Paul Scherrer Institute: Characterization of ultrathin carbon foils Open
The low-energy muon (LEM) beamline at the Paul Scherrer Institute currently stands as the world’s only facility providing a continuous beam of low-energy muons with keV energies for conducting muon spin rotation experiments on a nanometer …
View article: Design of a microwave spectrometer for high-precision Lamb shift spectroscopy of antihydrogen atoms
Design of a microwave spectrometer for high-precision Lamb shift spectroscopy of antihydrogen atoms Open
View article: Improving the low-energy muon beam quality of the LEM beamline at PSI: Characterisation of ultra-thin carbon foils
Improving the low-energy muon beam quality of the LEM beamline at PSI: Characterisation of ultra-thin carbon foils Open
The Low-Energy Muon beamline (LEM) at the Paul Scherrer Institute currently stands as the world's only facility providing a continuous beam of low-energy muons with keV energies for conducting muon spin rotation experiments on a nanometer …
View article: Development of wide range photon detection system for muonic X-ray spectroscopy
Development of wide range photon detection system for muonic X-ray spectroscopy Open
We have developed a photon detection system for muonic X-ray spectroscopy. The detector system consists of high-purity germanium detectors with BGO Compton suppressors. The signals from the detectors are readout with a digital acquisition …
View article: Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV
Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV Open
We present a novel technique for in-vacuum cavity-enhanced UV spectroscopy that allows nearly continuous measurements over several days, minimizing mirror degradation caused by high-power UV radiation. Our method relies on pulsing of the c…
View article: Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV
Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV Open
We present a novel technique for in-vacuum cavity-enhanced UV spectroscopy that allows nearly continuous measurements over several days, minimizing mirror degradation caused by high-power UV radiation. Our method relies on pulsing of the c…
View article: GermanIum array for non-destructive testing (GIANT) setup for muon-induced x-ray emission (MIXE) at the Paul Scherrer Institute
GermanIum array for non-destructive testing (GIANT) setup for muon-induced x-ray emission (MIXE) at the Paul Scherrer Institute Open
The usage of muonic x-rays to study elemental properties like nuclear radii ranges back to the seventies. This triggered the pioneering work at the Paul Scherrer Institute (PSI), during the eighties on the Muon-induced x-ray emission (MIXE…
View article: Update of Muonium 1S–2S transition frequency
Update of Muonium 1S–2S transition frequency Open
View article: Update of Muonium 1S-2S transition frequency
Update of Muonium 1S-2S transition frequency Open
We present an updated value of the Muonium 1S-2S transition frequency, highlighting contributions from different QED corrections as well as the large uncertainty in the Dirac contribution, stemming from the uncertainty of the electron-to-m…
View article: Measurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium
Measurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium Open
Muons are puzzling physicists since their discovery when they were first thought to be the meson predicted by Yukawa to mediate the strong force. The recent results at Fermilab on the muon g-2 anomaly puts the muonic sector once more under…
View article: Measurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium
Measurement of the transition frequency from 2S1/2, F = 0 to 2P1/2, F = 1 states in Muonium Open
View article: GermanIum Array for Non-destructive Testing (GIANT) setup for Muon Induced X-ray Emission (MIXE) at the Paul Scherrer Institute
GermanIum Array for Non-destructive Testing (GIANT) setup for Muon Induced X-ray Emission (MIXE) at the Paul Scherrer Institute Open
The usage of muonic X-rays to study elemental properties like nuclear radii ranges back to the seventies. This triggered the pioneering work at the Paul Scherrer Institute (PSI), during the eighties, on the Muon Induced X-ray Emission (MIX…
View article: Positron accumulation in the GBAR experiment
Positron accumulation in the GBAR experiment Open
View article: Measurement of the 2S1/2,F=0 → 2P1/2,F=1 transition in Muonium
Measurement of the 2S1/2,F=0 → 2P1/2,F=1 transition in Muonium Open
Here we present the results of the first measurement of the 2S1/2, F=0 -> 2P1/2, F=1 transition in Muonium, the hydrogen-like bound state of a positive muon and an electron. The measured value of 580.6+-6.8 MHz is in agreement with the the…
View article: Precision Measurement of the Lamb Shift in Muonium
Precision Measurement of the Lamb Shift in Muonium Open
We report a new measurement of the $n=2$ Lamb shift in Muonium using microwave spectroscopy. Our result of $1047.2(2.3)_\textrm{stat}(1.1)_\textrm{syst}$ MHz comprises an order of magnitude improvement upon the previous best measurement. T…