Contributions to a conference proceedings

More and more industrial customers require quality management (QM) systemimplementation and certification for their entire supply chain of the irradiation serviceat research reactors. In addition, users from the nuclear medicine and materialscience desire also such QM certificates for the isotope production or analysis.Neutron irradiation procedures aiming isotope production and the activation ofsamples for analytical purposes, including the Silicon doping, have been certificatedaccording to the ISO 9001:2015 at the research reactor FRM II since years.Additionally, the procedures for the gamma-irradiation in the spent fuel elements andthe instrumental neutron activation analysis (INAA) will get certified soon. [...]

The pink variety of beryl, morganite, is one of the most popularorangey-pink to pink gemstones. Its colour is attributedto manganese, both Mn2+ and Mn3+ (Nassau & Wood, 1968,Wood and Nassau, 1968, Schmetzer et al., 1974, Shigleyand Ford, 1984, Deer et al., 1992), which produce a seriesof spin-allowed absorption bands between 450 to 600 nm.Their exact position and quantity depends on the strengthand symmetry of the local crystal field, which, among others,also depends on the substitution mechanisms on theBe-position in the crystal lattice (Platonov et al., 1989). [...]

A high-dose gamma-irradiation facility has been developed for irradiation experiments in the spent fuel elements (SFE) at the research reactor FRM II. The irradiation is performed underwater [...]

Corundum, encompassing the highly prized ruby and sapphire varieties, stands as acornerstone of the global gemstone market. The allure and value of these gems have historicallydriven the development of various treatment techniques aimed at enhancing their colour andclarity. [...]

This paper investigates the impact of residual-stress-based flux barriers on the performance of permanent magnet synchronous machines (PMSMs) by using finite element analysis. In contrast to conventional cutout-based flux barriers, which improve magnetic anisotropy but compromise mechanical strength, residual-stress-based flux barriers improve structural integrity. [...]

Recent developments on neutron imaging and tomography at the Laboratory of Neutron Physics are reported. Neutron imaging brings unique opportunities in various applications, including energy research, materials science, cultural heritage studies, and industrial engineering. [...]

The first successful demonstration of broadband laser cooling of positronium (Ps) atoms, obtained within the AEgIS experiment at CERN, is presented here. By employing a custom-designed pulsed alexandrite laser system at 243 nm featuring long-duration pulses of 70 ns and an energy able to saturate the 1${}^3$S–2${}^3$P transition over the broad spectrum range of 360 GHz, the temperature of a room-temperature Ps cloud was reduced from 380 K to 170 K in 70 ns. [...]

In the context of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) located at CERN, positron-positronium converters with a high positron-positronium conversion efficiency have been designed in both reflection and transmission geometries. The converters utilize nanochanneled silicon target technology with positron conversion efficiencies up to around 50% and around 16%, at room temperature and in the absence of magnetic fields, for reflection and transmission respectively. [...]

Antihydrogen formation at AEgIS at CERN leverages charge exchange between Rydberg positronium (Ps*) and antiprotons, with cross-sections scaling with the Ps principal quantum number n4 and inversely with relative velocity v−2. However, the motional Stark effect and velocity mismatch between Ps and antiprotons impose stringent constraints, limiting efficiency. [...]

The AEgIS (Antimatter Experiment: Gravity, Interferometry and Spectroscopy) project, based at CERN's Antiproton Decelerator (AD) facility seeks to probe the Weak Equivalence Principle (WEP) for antimatter. It has undergone significant enhancements, capitalizing on the increased quantity of colder antiprotons made available by the Extra Low Energy Antiproton Ring (ELENA) decelerator. [...]