Microscopic analysis of quadrupole collective motion in Cr-Fe nuclei. II. Doorway nature of mixed-symmetry states
- Department of Physics, Faculty of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263 (Japan)
- Department of Physics, Faculty of Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113 (Japan)
The mixed-symmetry collective modes are investigated in Cr-Fe nuclei, by analyzing the realistic shell-model wave functions via the H{sup 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{sup P}=2{sup +}. An indication of the mixed-symmetry 3{sup +} state is obtained. The sequence of the mixed-symmetry 2{sup +}, 1{sup +}, and 3{sup +} levels and its nucleus dependence are discussed. Calculated M1 and M3 transitions in the low-energy region suggest that the mixed-symmetry 1{sup +} and 3{sup +} 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{sup +} component is well separated from the peak of the spin excitation. The isospin-raising component has a peak, well separated from the isospin-conserving one. The orbital angular-momentum contributes destructively to the spin excitations. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 496864
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 55; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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