g-Factor Measurements Of Isomeric States In Neutron Rich Nuclei

摘要

We report on the first application of the TDPAD method to measure the g factor of neutron-rich isomeric states, produced and aligned in a projectile fragmentation reaction. The feasibility of similar measurement opens up a new, unexplored region of the nuclear chart for studies of the magnetic moments of microsecond isomers. Nuclei around ~(68)Ni were produced following the fragmentation of 61.6 MeV/u ~(76)Ge on a 145 mg/cm~2 Be target. The isotopes of interest were selected using the LISE spectrometer at GANIL, Caen, France, and were implanted in a high purity Cu foil fixed between the poles of an electromagnet. Two Ge Clover detectors, positioned in a plane perpendicular to the holding magnetic field, were used to observe the rotation of the nuclear spin ensemble and to derive the experimental R(t) function. The experimental result for the isomer in ~(67)Ni (J~π = 9/2~+, T_(1/2) = 13.3 μs, E_x = 1007 keV), |g| = 0.125(6), is presented herein and is also compared to the theoretical expectations.