|Vud| from T = 1/2 mirror transitions and the role of atom and ion traps O. Naviliat-Cuncic and N. Severijns Eur. Phys. J. A, 42 3 (2009) 327-331 Published online: 10 June 2009 DOI: 10.1140/epja/i2009-10821-7