IMPAC in-beam and out-of-beam; g-factors and pre-equilibrium effects following ion-implantation

An out-of-beam IMPAC technique has been developed to measure the g-factors of the 2₁⁺ states in the neutron-deficient Pt isotopes. The hyperfine field for R in Fe in those measurements was close to the field obtained in spin-echo and radioactivity measurements, in contrast with in-beam IMPAC measurements for ^194,196,198Pt, where smaller field strengths were observed. These data, and static fields from in-beam IMPAC measurements for other ions in the Pt region, show a correlation with the lifetime of the probe state, consistent with the static field being absent for about 10 ps after the ion has come to rest. New and previously published IMPAC data for ₇₆Os, ₇₇Ir, ₇₈Pt and ₇₉Au in Fe hosts, are examined to assess whether such measurements may be sensitive to the thermal spike created at the end of the range of an implanted ion.