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The elastic scattering cross section of 92 Mo(α,α) 92 Mo has been measured at energies of Ec.m. ≈ 13, 16, and 19 MeV in a wide angular range. The real and imaginary parts of the optical potential for the system 92 Mo-α have been derived at energies around and below the Coulomb barrier. The result fits into the systematic behavior of α-nucleus folding(More)
A concentration of electric-dipole excitations below the particle threshold, which is frequently denoted as the pygmy dipole resonance, has been studied in the semimagic nucleus 140Ce in (alpha, alpha' gamma) experiments at E alpha = 136 MeV. The technique of alpha-gamma coincidence experiments allows the separation of E1 excitations from states of other(More)
The electric dipole strength distribution in 44Ca has been measured up to 10 MeV in high resolution photon scattering experiments for the first time. The data obtained have been compared to earlier measurements on (40,48)Ca in order to view the evolution of the electric pygmy dipole resonance (PDR). Calculations that were performed within the framework of(More)
Lifetime measurements of yrast levels in 162 Yb and 166 Hf were performed using the recoil distance Doppler-shift method in coincidence mode. Excited states in 162 Yb and 166 Hf were populated via the reactions 116 Cd(50 Ti, 4n) and 122 Sn(48 Ti, 4n), respectively. The resulting B(E2) values are compared with the X(5) critical point model predictions and(More)
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