In-beam Mossbauer study of Mn-57/Fe-57 in Si following projectile fragmentation and implantation

A new implantation technique is developed for the in-beam Mossbauer spectro scopy with implantation energy of several GeV using the RIken Projectile Se parator (RIPS). Mn-57 (T-1/2= 1.45 min) ions can be produced and subsequent ly implanted into any material as a secondary radioactive beam by the proje ctile-fragmentation reaction of Co-59 beam with a Be target. The Mossbauer spectra of Fe-57 in a p-type (100) FZ-Si following beta-decay from Mn-57 we re measured at different temperatures between 30 and 296 K. The spectra can be fitted with two single lines, which are assigned to interstitial and su bstitutional Fe-57 atoms in Si. This technique can be easily applied to oth er nuclear probes, and therefore, opens a new possibility for Mossbauer spe ctroscopy complementary to synchrotron techniques.