Author/Authors :
De Rydt، نويسنده , , M. and Lozeva، نويسنده , , R. and Vermeulen، نويسنده , , N. and de Oliveira Santos، نويسنده , , F. and Grévy، نويسنده , , S. and Himpe، نويسنده , , P. and Stِdel، نويسنده , , C. and Thomas، نويسنده , , J.C. and Vingerhoets، نويسنده , , P. and Neyens، نويسنده , , G.، نويسنده ,
Abstract :
A new β -NMR / β -NQR setup is developed to study nuclear magnetic dipole moments and electric quadrupole moments at the LISE fragment separator at GANIL. Two key elements make the new design very powerful: the homogeneous magnet and the strong radio-frequency amplifier. The combination of both makes it possible to examine a broad spectrum of magnetic dipole and electric quadrupole moments. Several factors have an influence on the detection efficiency and on the sensitivity of the setup to observe a resonant change in the β -asymmetry : the thickness and the tilting angle of the implantation crystal, the material in the vacuum chamber, the applied magnetic field and the Q β -value of the decaying nuclei. A detailed study of these effects is made using a dedicated GEANT4 Monte Carlo simulation code.
Keywords :
Detection system , Nuclear moments , ? -Nuclear quadrupole resonance ( ? -NQR ) , ? -Nuclear magnetic resonance ( ? -NMR ) , GEANT4
