sup 219 Fr, a transitional reflection asymmetric nucleus

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.676· OSTI ID:5184125

Liang, C F; Paris, P ^[1]; Kvasil, J; Sheline, R K ^[2]

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1. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Batiment 104, 91405 Campus Orsay (France)
2. Departments of Chemistry and Physics, Florida State University, Tallahassee, Florida (USA)

Mass-separated sources of {sup 223}Ac (separated as AcF{sub 2}{sup +}) were used to study the level structure of {sup 219}Fr following alpha decay. The levels in {sup 219}Fr are interpreted in terms of {ital K}=1/2{sup {plus minus}}, 3/2{sup {plus minus}}, and 5/2{sup {plus minus}} parity doublet bands which have a natural theoretical explanation in terms of reflection asymmetric models. The 9/2{sup {minus}} ground-state member of the {ital K}=1/2{sup {minus}} band in {sup 219}Fr can be understood in terms of both reflection asymmetry and the collapse of the quadrupole-octupole Nilsson orbitals towards the {ital h}{sub 9/2} orbitals of spherical symmetry. Comparison of the {ital K}=1/2{sup {minus}} ground-state bands in {sup 219}Fr and {sup 221}Fr reveals the details of this transformation. Theoretical analysis of the microscopic structure of several of the positive-parity bands indicates the presence of important Nilsson configurations arising from the shell below.

• OSTI ID: 5184125
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 44:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIUM 223
ALPHA DECAY
FRANCIUM 219
ENERGY LEVELS
COINCIDENCE SPECTROMETRY
ELECTRON SPECTRA
NILSSON-MOTTELSON MODEL
NUCLEAR DEFORMATION
OCTUPOLES
PARITY
QUADRUPOLES
SHELL MODELS
SPIN
SYMMETRY BREAKING
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIUM ISOTOPES
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
COINCIDENCE METHODS
COUNTING TECHNIQUES
DECAY
DEFORMATION
ELECTRON CAPTURE RADIOISOTOPES
FRANCIUM ISOTOPES
HEAVY NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MILLISEC LIVING RADIOISOTOPES
MINUTES LIVING RADIOISOTOPES
MULTIPOLES
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEI
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTRA
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental
653001 - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models