Chemistry Reference
In-Depth Information
Fig. 6.25
RIKEN-separator configuration
RI beams. RIPS is an in-flight type radioactive isotope (RI) separator to produce
RI beams using the fragmentation of the heavy ion beams. RIPS is an achromatic
spectrometer, as is shown in Fig.
6.25
, consisting of two magnetic separation
sections, which enables us to separate RI beams with high resolution. For on-line
Mössbauer spectroscopy,
57
Mn/
57
Fe isotopes are separated by RIPS. The set-up for
on-line Mössbauer spectroscopy of
57
Mn/
57
Fe isotopes is installed at the end of the
RIPS beam line behind the F3 chamber, as is shown in Fig.
6.26
.
The on-line
57
Mn/
57
Fe Mössbauer experiments were performed to clarify the
lattice sites and the charge states of
57
Fe in Si materials at high temperatures up to
1,200 K [
39
-
42
] as well as under light illumination [
43
]. The implantation energy
of
57
Mn/
57
Fe used in this experiment is an order of GeV, which is several orders of
magnitude higher than that used in other implantation experiments, and therefore
the highest energy applied so far for solid state physics. At CERN, for instance, the
energy is 60 keV. Generally speaking, a GeV-nuclear probe implanted into
material is known to create a columnar defect due to the electrical stopping, and
subsequently cascade damages due to the nuclear stopping interactions. At the last
