GAMMA-RAY STRENGTH FUNCTIONS FOR RH-104, TM-170, AND AU-198

Gamma-ray spectra following neutron capture in rhodium, thulium, and gold for neutron energies between 0.5 and 3.0 MeV have been measured with a NaI scintillator surrounded by an annular NaI crystal. The γ-ray strength functions were deduced from the capture γ-ray spectra by the spectrum fitting method. A bump around 6 MeV is observed for gold as well as a smaller one around 3.5 MeV for thulium. The present results are compared with extrapolations of giant dipole resonance data and measured average total radiative widths. NUCLEAR REACTIONS Rh103, Tm169, Au197((n,γ),), En=0.5-3.0 MeV, measured σ(En, Eγ). Deduced γ-ray strength functions. Comparison with other data. © 1979 The American Physical Society.