Magnetic Moment Measurement of Short Lived States via the Doppler Shift Transient Field Method

Abstract

Magnetic moment measurements of picosecond states generally make use of the huge transient magnetic fields which fast nuclei experience during their passage through a ferromagnetic foil. Based on the Recoil Distance Transient Field (RDTF) method previously pioneered by the Gottingen group, we propose the Doppler Shift Transient Field (DSTF) method to measure g-factors of short-lived high-spin states excited in a heavy ion fusion reaction at a high recoil velocity. This method can be used whenever the state is populated by fast discrete feeder transitions γ2. By measuring the Larmor precession of the decay γ-ray γ1 with a gate set on the Doppler shifted tail of γ2, one selects events of high recoil velocity (= high transient field) and avoids, to a large extent, the uncertainties of delayed side and cascade feedings inherent in heavy-ion fusion reactions. Estimates are given for the DSTF precessions in 102Cd and 74Br.