Study of nuclear level density and gamma-strength function in 90-Zr, 196-Pt, 197-Pt

The level density of $ ^{90} Zr$ was obtained by measuring neutron evaporation spectra from the $ ^{89} Y(d, n) ^{90} Zr$ reaction at $E_{d} = 7.5 MeV$. The experiment was carried out at the Edwards Accelerator Laboratory. The $\gamma$ -strength functions and level densities of $ ^{196} Pt$ and $ ^{197} Pt$ from $ ^{196} Pt (p, p' \gamma) ^{196} Pt$ and $ ^{196} Pt (d, p \gamma ) ^{197} Pt$ reactions were obtained at the Oslo Cyclotron Laboratory by measuring $ p-\gamma$ coincidences. Level densities were compared to the known discrete levels and neutron resonance spacings at the neutron separation energy. They were also compared with model calculation.