The quadrupole moment of18N, measured with the Level Mixing Resonance (LMR) method

We report on the Level Mixing Resonance experiment performed on the s-decaying18N nucleus produced and aligned in an intermediate-energy fragmentation reaction. From the resonantly induced change in the asymmetry of the s-decay, measured as a function of a static magnetic field, we derived information on the nuclear moments of the neutron-rich18N nucleus. The spectroscopic quadrupole moment |Q(18N, 1−1)| = 3.2(3)e fm2 is compared to mean-field calculations.