Author/Authors :
P Bednarczyk، نويسنده , , Styczen، J. نويسنده , , R Broda، نويسنده , , M Lach، نويسنده , , W Meczy?ski، نويسنده , , W Nazarewicz، نويسنده , , W.E Ormand، نويسنده , , W Satu?a، نويسنده , , D Bazzacco، نويسنده , , F Brandolini، نويسنده , , G de Angelis، نويسنده , , S Lunardi، نويسنده , , L Müller، نويسنده , , N.H. Medina، نويسنده , , C.M. Petrache ، نويسنده , , C.Rossi Alvarez، نويسنده , , F Scarlassara، نويسنده , , G.F. Segato، نويسنده , , C Signorini، نويسنده , , F. Soramel، نويسنده , , et al.، نويسنده ,
Abstract :
High-spin states in 43Ca, 45Sc, and 45Ti were studied with the GASP multidetector array coupled with the Recoil Mass Spectrometer. The nuclei were excited in the 60 MeV 18O +30Si reaction. Lifetimes were extracted from the analysis of the Doppler-shift attenuation of γ-rays observed in the reversed 35Cl+12C reaction. The lifetimes, B(M1) and B(E2) values for 45Sc are presented. The measurements suggest significant deformation of the positive-parity intruder band in this nucleus. The band is predicted by the mean-field calculations to be the cross-shell particle-hole excitation associated with a strong quadrupole core-polarization. Spherical shell-model calculations reproduce observed excitation energies and transition rates in both spherical and deformed structures.
Keywords :
Gamma rays and mass spectroscopy , DSAM lifetime measurements , High spins , Shell model , Nuclear deformation
