gFactor Measurements of High-Spin (Iπ≤10+) Rotational States

g-factors of the ground state rotational band of158Dy

“…Apparently the static hyperfine field observed at the site of stable or radioactive Dy nuclei in ferromagnetic environments at low temperature agrees within the experimental limits of errors with the hyperfine field calculated for the 4f-shell of free [301 On the other hand the effective hyperfine field observed by in-beam experiments is by a factor between two and four smaller. For the system DyGd Skaali et al [3] and Kalish et al [4] reported values more than a factor of two smaller than ours which may be due to the higher temperature of their target (77 K) and the smaller polarizing field.…”

“…For a complete magnetization of the Gd foil the external field must be considerably larger than the saturation magnetization of Gd (Bsat(Gd)~2.5 T) in order to overcome the demagneti-zation field. On the other hand this geometry has the great advantage in comparison to earlier 7-IPAD (integral measurement of perturbed angular distributions) measurements [3,4] that there is no beam bending at all and one is not limited in the strength of the polarizing field. Furthermore the observation of populating and depopulating 7-transitions in coincidence for each of the investigated levels reduces systematic errors which may be produced in 7-IPAD measurements by additional rotations in higher levels of the deexitation ),-cascades including the continuum transitions.…”

“…The first experimental data on the ground state rotational band of 158Dy were published by Kalish et al [4] who combined their results on perturbed angular distribution shifts observed after Gd (~, 2n)-reactions with Coulomb excitation data [3]. Their quoted absolute value, g= +0.36 (6), for the 4 +, 6 + and 8 + states relies on the observation that for the three isotopes 156,158,162Dy a plot of the data for eorr for the 4 +, 6 + and 8 + states versus the mean lifes follows one common straight line.…”

“…The effective static hyperfine field can be calibrated by use of the measured g (4 +). This calibration is necessary since it is known from earlier perturbed angular distribution measurements [3,4] that the effective field may be much smaller than observed by NMR-experiments [5].…”

g-factor of the 4 1 + rotational state of160Dy

“…An early Gd(c~, 2n) experiment by Kalish et al [21] which used the static hyperfine field indicated constant g-factors for 158Dy, 16~ and 162Dy in the ground state rotational band up to I = 8 +, however, the accuracy was very low.…”