Parities of low-energy states in Hf and W isotopes

Omer, M.  ; Shizuma, Toshiyuki*; Hajima, Ryoichi*; Koizumi, Mitsuo 

Nuclear resonance fluorescence experiments have been performed on Hf and W natural targets in the 2.5-3.1 MeV energy range using quasi monochromatic -ray beams generated from laser Compton scattering at the HIS facility, Duke University. The complete polarization of the incident -rays has provided the determination of the parity of states in this energy range. Results of these experiment have revealed the parity of about 15 levels in Hf and W nuclei. Such data provide knowledge about the nondestructive detection system of nuclear material by understanding the so-called scissors mode encountered in deformed nuclei including uranium and plutonium isotopes.