Precession measurements following Coulomb excitation with oxygen ions (VI). Hyperfine interactions of nuclei in highly ionized atoms

Nuclear deorientation for heavy ions recoiling in vacuum and low pressure gas

“…The quantity 1/rc(rad ) is a rough measure of the rate of fluctuation of the hyperfine fields. The value zc(rad ) = 3.5 ps is in agreement with the value 3ps obtained by Ben Zvi et al [1]. The vacuum r.m.s, hyperfine field at the site of the nucleus is 6 kT.…”

“…In the perturbation of nuclear states with high spin, I >5, a marked levelling off of the initial quasiexponential decay has been observed [19]. Furthermore, in heavy ion recoil at very low energy, v < 0.002 c, the most striking fact is a time-oscillatory structure of the attenuation coefficients [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

“…On a nuclear basis perturbed angular distribution measurements, profiting from ionic hyperfine fields of the order of 5kT, provide a powerful means for the determination of g-factors of short-lived nuclear states [1][2][3][4][5][6]. On an atomic basis the relaxation of the nuclear spin reflects the time behaviour of the ionic hyperfine fields.…”

“…Most of the pertinent experimental data from perturbed angular distribution measurements have been analyzed on the basis of the well known Abragam and Pound (A.P.) model [9] for randomly fluctuating extranuclear fields, following the original suggestion of Ben Zvi et al [1]. Data from recoil-into-gas experiments at high gas pressures P>100Torr, un-* Supported by the Bundesministerium ftir Forschung und Technologie ** Present address: Nuclear Physics Laboratory Oxford OX 1-3 RH, Great Britain doubtedly reproduce the A.P.…”

Simultaneous deorientation and lifetime measurement in98Ru using the recoil distance Doppler shift method in inverse Coulomb excitation

“…Two limiting theories exist for the description of the deorientation effect. On one side, based on the theory of Abragam and Pound [33], first applied to deorientation in [34], the hyperfine interaction is described within a time-dependent perturbation framework and a rapidly changing hyperfine field. The second description is based on a static perturbation assuming a stable electron configuration, e.g., [23,24,35,36].…”