Magnetic rotation and quasicollective structures in Fe-58: Influence of the nug9/2 orbital
Apr, 2012
23 pages
Published in:
- Phys.Rev.C 85 (2012) 044316
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Abstract: (APS)
The structure of 58Fe was investigated at Gammasphere using 48Ca(13,14C,xn) fusion-evaporation reactions at a beam energy of 130 MeV. The level scheme has been revised and extended to J∼17ℏ and an excitation energy of 16.6 MeV. Regular band structures consisting of low-energy ΔJ=1ℏ transitions have been observed at moderate spin (J∼8ℏ–15ℏ) and are candidates for magnetic rotational bands. Self-consistent tilted-axis-cranking calculations within a relativistic mean-field theory were applied to investigate these bands and were found to reproduce the experimental results well. In other parts of the level scheme, quasirotational bands composed of stretched-E2 transitions have been extended to high spin, and other new bands have been identified. Positive-parity experimental states were compared to predictions of the spherical shell model using the GXPF1A, KB3G, and FPD6 effective interactions in the fp model space. The projected shell model, with a deformed quasiparticle basis including the neutron νg9/2 orbital, was applied to interpret regular ΔJ=2ℏ band structures that extend beyond the maximum spin available for π[(f7/2)−2] ⊗ ν[(p3/2f5/2p1/2)4] configurations and exhibit features characteristic of rotational alignment. It is clear that the νg9/2 intruder orbital plays a crucial role in describing the quasirotational structures in this nucleus, even starting as low as J∼5ℏ.- 25.70.Jj
- 23.20.Lv
- 27.40.+z
- 23.20.En
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