IMPAC IN-BEAM AND OUT-OF-BEAM - G-FACTORS AND PREEQUILIBRIUM EFFECTS FOLLOWING ION-IMPLANTATION

An out-of-beam IMPAC technique has been developed to measure the g-fac tors of the 2(1)(+) states in the neutron-deficient Pt isotopes. The h yperfine field for Pt in Fe in those measurements was close to the fie ld obtained in spin-echo and radioactivity measurements, in contrast w ith in-beam IMPAC measurements for Pt-194,Pt-196,Pt-198, 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 correl ation 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. Ne w and previously published IMPAC data for Os-76, Ir-77, Pt-78 and Au-7 9 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.