1. C2TN, Dept. de Eng. e Ciências Nucleares, Instituto Superior Técnico, Universidade de Lisboa, CTN, EN10, km139.7, Bobadela LRS 2695-066, Portugal
2. Low Temperature Solutions UG, Bahnhofstrasse 21, Ismaning D-85737, Germany
3. Kirchhoff Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, Heidelberg 69120, Germany
4. Inst. of Nuc. and Particle Phys., National Centre for Sci. Res., “Demokritos”, Patr. Grigoriou E’ & 27 Neapoleos St, Agia Paraskevi 15310, Greece
5. Kaon GmbH, Gollierstr. 70 C1, München 80339, Germany