Magnetized nonneutral plasma composed of electrons or positrons couples to the local microwave environment via cyclotron radiation. The equilibrium plasma temperature depends on the microwave energy density near the cyclotron frequency. Fine copper meshes and cryogenic microwave absorbing material were used to lower the effective temperature of the radiation environment in ASACUSA's Cusp trap, resulting in significantly reduced plasma temperature.
The LaBr3:Ce scintillator offers the unique opportunity to study the 138 La β − radioactive decay. This decay is a 2nd-order unique forbidden transition. The 138 La isotope is one of the rarest isotopes on earth (it is present as 0.09% in natural lanthanum) and it has an extremely long lifetime, of the order of 10 11 years. Large amounts of 138 La are, indeed, needed for the measurement of the β − -decay spectrum. In the literature, only one experimental measurement is present and the results are not reproduced by theoretical calculations. A second measurement of the β − continuum is presented in this work. For this measurement, two LaBr3:Ce scintillators (3 × 3 ) were used. The measured spectrum β − is found to be comparable to the one previously measured and published.
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