Hyperfine fields at ⁶⁶Ga, ⁶⁷,⁶⁹Ge implanted into iron and gadolinium hosts at 6 K, and applications to g-factor measurements

Abstract

Isomers in 66Ga, 67Ge, and 69Ge were recoil implanted into ferromagnetic hosts of iron and gadolinium at ≈6 K, and the hyperfine magnetic fields were determined by time differential perturbed angular distribution (TDPAD) measurements. The hyperfine field strengths at ≈6 K are compared to the results of previous highertemperature measurements and the amplitudes of the R(t) functions are compared to empirical expectations. The results show that gadolinium can be a suitable host for high-precision in-beam g-factor measurements. The results of new g-factor measurements for isomers in 66Ga and 67Ge are g( 66Ga, 7−) = +0.126(4), supporting a [πf 5/2 ⊗ νg9/2]7− configuration assignment, and g(67Ge, 9/2 +) = −0.1932(22), derived from a new measurement of the ratio g(67Ge)/g( 69Ge) = 0.869(9). These values are in agreement with previous results. The R(t) amplitudes indicate that the nuclear alignment produced in the isomeric states was significantly lower than the empirically expected σ /I ≈ 0.35. Show more