New developments in transient field measurements

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

“…(7)- (9). Thus the value we obtain for the g factor of the first 2 + state in 72 Zn is g = +0.18 (17). The experimental error is dominated by the uncertainties in the measured precession angles; uncertainties in the velocity and Z dependence of the transient field are negligible in comparison.…”

“…For the iron host, which has been discussed briefly elsewhere [45], the observed field strength of B tf = 0.17 (17) kTesla implies a K-shell polarization of p 1s = 0.0007 (7). In discussions of the host dependence of the polarization of K-shell vacancies and the consequent transient-field strength, comparisons are often made with the degree of polarization of the outer shells of the host [19].…”

“…In both cases the velocities of the polarized electrons in the host are much smaller than the K-shell electron velocities for heavy projectile ions. For light ions (Z < 20) the degree of polarization for single K-shell electrons has been found to be largely independent on the ion velocity up to v ion ∼ Zv 0 [2,[16][17][18][19][20]. However as Z increases the difference between Zv 0 and the velocity of the polarized electrons increases.…”

Hyperfine interaction studies on swift O-ions emerging with polarized electrons from ferromagnetic layers into vacuum

“…The latter was accomplished with a plunger set-up combining the PAC technique with the recoil-distance method commonly used in lifetime measurements [9]. By the observation of quantum beats from the HFI between the ),-emitting 3--state in 160 and a polarized 1 s-electron of the ions emerging from a magnetized thin Fe-layer, a degree of polarization of p1~=0.060 (6) was obtained which, however, is only half of what has been found in TF measurements (see above and [9]). This deficit in the polarization has been attributed to depolarizations by nonmagnetic surface layers (e.g.…”

“…With reference to the simple relationship for the TF strength of H-like ions as given by [4] BTF = Pls" qls" Bls (O) (1) where ql~ is the velocity dependent ion fraction with a single electron in the ls-state and B1~(O)=8.55 kT its Fermi-contact field at the oxygen nucleus, the following degrees of electron polarization were deduced at a velocity of Vion~-7 v o (v 0 = c/137) [4,6]:…”