Pair condensates in realistic shell model states. II. M 1 states in sup 54,56 Cr and sup 56,58,60 Fe

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.2467· OSTI ID:5134361

Halse, P ^[1]

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1. School of Physics, University of Melbourne, Parkville 3052 (Australia)

The possible microscopic realization of interacting boson model (IBM) collective {ital M}1 modes is investigated for {sup 54,56}Cr and {sup 56,58,60}Fe, using a shell-model space of protons in the 1{ital f}{sub 7/2} orbit and neutrons in the 2{ital p}{sub 3/2}, 1{ital f}{sub 5/2}, and 2{ital p}{sub 1/2} orbits. Distributions of the pair analogues of IBM-2 mixed-symmetry states, and of some {ital g}-IBM-2 states, over shell-model eigenstates are explicitly determined. For {ital J}=1, the mixed-symmetry {ital SD} strength is generally lower than that of the {ital G}-pair states, and responsible for most of the low-energy {ital M}1 strength. Structures incorporating extended sets of levels, including the {ital M}1 states, corresponding to the {ital sd}-IBM-2 U(5){contains}SO(6){contains}SO(5) dynamical symmetry representations ({ital N}{minus}1,1) ({ital N}{minus}1,1,0) ({tau}) are manifest in the shell-model spectra for {sup 56}Fe and {sup 54}Cr. The correspondence with observed levels is discussed.

• OSTI ID: 5134361
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHROMIUM 54
CHROMIUM 56
CHROMIUM ISOTOPES
COLLECTIVE EXCITATIONS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
INTERACTING BOSON MODEL
INTERMEDIATE MASS NUCLEI
IRON 56
IRON 58
IRON 60
IRON ISOTOPES
ISOTOPES
M1-TRANSITIONS
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEI
RADIOISOTOPES
SHELL MODELS
STABLE ISOTOPES
YEARS LIVING RADIOISOTOPES