In-Beam M\"{o}ssbauer Spectroscopy Using Heavy Ion Beams at HIMAC

The in-beam M\"{o}ssbauer spectroscopy, in which a short-lived probe nucleus is introduced into a material for on-line measurement, has been applied to materials science and chemistry, because it has unique advantages in investigating microscopic behavior of extremely dilute impurity atoms or exotic chemical states in solids. The short-lived nucleus $^{57}$Mn ($T_{1/2}$ = 1.47 m) is useful for the M\"{o}ssbauer spectroscopy of $^{57}$Fe which is created following the $\beta$ decay of $^{57}$Mn. We have started to develop a $^{57}$Mn secondary beam as the M\"{o}ssbauer probe at Heavy Ion Accelerator in Chiba (HIMAC) in National Institute of Radiological Sciences (NIRS). The $^{57}$Mn nuclei produced through the projectile fragmentation of $^{59}$Co and $^{58}$Fe beams at 500 MeV/nucleon were separated by a fragment separator and were implanted into samples. Clear M\"{o}ssbauer spectra of $^{57}$Fe in some materials were successfully observed under suppression of background events by anti-coincidence with beam-pulse and $\beta$-ray signals.