Transient Magnetic Fields at Swift Ions Traversing Ferromagnetic Media and Application to Measurements of Nuclear Moments

Firstg(2+)measurement on neutron-rich72Zn, and the high-velocity transient field technique for radioactive heavy-ion beams

“…The only previous radioactive beam measurement by this method, on 38 S and 40 S, was performed at NSCL [12,13]. Similar measurements on stable beams include studies on high velocity 32 S, 40 Ar, and 52 Cr [21][22][23][24].…”

“…In contrast, iron is ferromagnetic at room temperature. The higher stopping power in iron can be advantageous when the half-life of the state to be measured is comparable with the interaction time, i.e., for fast beams (v ≈ Zv 0 ) and short-lived states with lifetimes of a few picoseconds, as was the case in the measurement on 38 S reported in Ref. [12].…”

Nuclear g-factor measurement with time-dependent recoil in vacuum in radioactive-beam geometry

“…The useful hyperfine magnetic fields are the transient magnetic field (TF) [1] and the free-ion hyperfine fields of ions recoiling in vacuum (RIV) [2,3]. In the case of the RIV technique, as applied recently to heavy radioactive ion beams [4,5,6], the averaging of the hyperfine frequency over the different electronic configurations gives a quasiexponential dependence of the vacuum attenuation factors, G k , as a function of the lifetime of the state of interest.…”

Low-energy structure of the even-ARu96−104isotopes viaTaylor1, Gürdal2, Kumbartzki3 et al. 2011Phys. Rev. C

“…The transient field perturbed angular correlation technique [18] combined with Coulomb excitation in inverse kinematics [19] was used. Isotopically pure Ru beams were accelerated by the ESTU tandem accelerator of the Wright Nuclear Structure Laboratory at Yale University.…”

“…This effect becomes significant if τ , the mean life of the excited state, is of the same order as, or shorter than, the transit time through the ferromagnetic layer. The dependence of the transient field on the ion velocity and atomic number has been studied empirically and the strength of the field can be obtained from a fit to data on known g factors [18,22]. The TF strength can also be determined from the measurement of a known g factor in a neighboring nucleus (similar Z) performed under similar kinematic conditions (similar v(t)).…”