Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-03-11
Phys.Rev.C55:2418-2426,1997
Physics
Nuclear Physics
Nuclear Theory
Revtex 24 pages & 8 EPS figures, to appear in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.55.2418
The mixed-symmetry collective modes are investigated in Cr-Fe nuclei, by analyzing the realistic shell-model wavefunctions via the H^n-cooling method. It is clarified that the relatively low-lying mixed-symmetry states behave like doorway states. For these nearly spherical nuclei, the lowest mixed-symmetry state is shown to have $J^P=2^+$. An indication of the mixed-symmetry 3^+ state is obtained. The sequence of the mixed-symmetry 2^+, 1^+ and 3^+ levels and its nucleus-dependence are discussed. Calculated M1 and M3 transitions in the low-energy region suggest that the mixed-symmetry 1^+ and 3^+ components are detectable. We investigate the B(M1) distribution in a wider energy range, without breaking the isospin quantum number. It is confirmed that the mixed-symmetry 1^+ component is well separated from the peak of the spin excitation. The isospin-raising component has a peak, separated well from the isospin-conserving one. The orbital angular-momentum contributes destructively to the spin excitations.
Nakada Hitoshi
Otsuka Tomohiro
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