Alan Scott

Inelastic scattering of 61 mev protons from 90Zr and 89Y

Abstract Differential cross sections for the excitation by 61.2 MeV protons of the first seven resolved states in 90 Zr have been measured over the angular range 18°–105°. The results are analyzed using a microscopic model including knock-on exchange and core polarization, with central interactions of Yukawa and Hamada-Johnston type. The analogous excitations of the 5 − state in 90 Zr and the 9 2 + state in 89 Y are compared; it is shown that core polarization of the E5 type is more important for the former, but there may be additional core polarization of M4 type in the latter transition. It is also shown that unnatural-parity exchange may be important for the excitation of the ( g 9 2 ) 2 sequence of states in 90 Zr. Both microscopic and collective models were used for the 3 − state in 90 Zr.

Inelastic scattering of 61 MeV protons from 89Y and the associated reaction mechanisms

Abstract The differential cross sections for the excitation of the first seven resolved excited states of 89 Y by 61.2 MeV protons have been measured over the angular range 17°–120°. One of these is the weakly excited state at 2.62 MeV. The inelastic scattering data are analysed using the collective model and a microscopic model including both core polarization and a central spindependent effective interaction.

194Pt(12C, 12C′) reaction and the triaxial-rotor model

Abstract Elastic and inelastic scattering differential cross sections for the 194 Pt( 12 C, 12 C′) reaction at a bombarding energy of 78 MeV have been measured. Data have been obtained for 0 + , 2 + , 4 + , and 2 +′ , states in 194 Pt. The data have been analyzed using a rigid asymmetric-rotor model in coupled-channels reaction calculations. It is found that satisfactory fits to all data can be obtained but only if the hexadecapole deformation is included in the asymmetric-rotor model.

30Si(12C, 12C') reaction at 41.3 MeV

Abstract Angular distributions for the 0+, 2+ states of 30Si have been measured for the 30Si(12C, 12C) reaction at a lab energy of 41.3 MeV. The data have been analyzed using coupled-channels calculations incorporating three possible models for the structure of 30Si — an oblate rotor, a prolate rotor, and a harmonic vibrator. Based on the quality of the fits to the data as determined by the minimum χ2. a prolate-rotor model is favored.