Level structure of the shell-model nucleus [sup 217]At

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.1192· OSTI ID:6403414

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

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1. Chemistry and Physics Departments, Florida State University, Tallahassee, Florida 32306 (United States)
2. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, IN2P3, Centre National de la Recherche Scientifique, Batiment 104, 91405 Campus Orsay (France)

Alpha recoil separation of a large number of [sup 221]Fr sources from a pure almost massless source of [sup 225]Ac made possible the study of the level structure of [sup 217]At following alpha decay from [sup 221]Fr. Alphas in coincidence with all gammas and gammas and electrons in coincidence with [sup 221]Fr alphas were used in this study. The levels in [sup 217]At can be interpreted in terms of the [pi]([ital h][sub 9/2])[sup 3] [nu]([ital g][sub 9/2])[sup [minus]4], [pi]([ital h][sub 9/2])[sup 2] f[sub 7/2] [nu]([ital g][sub 9/2])[sup [minus]4], and [pi]([ital h][sub 9/2])[sup 2] [ital i][sub 13/2] [nu]([ital g][sub 9/2])[sup [minus]4] shell-model configurations. Considerable similarity in the configurations and energies of the states of [sup 217]At and [sup 215]At is observed. The only change is in the neutron part of the configurations where the particle'' partial configuration in [sup 215]At (...[nu]([ital g][sub 9/2])[sup 4]) is replaced by the hole'' partial configuration in [sup 217]At (...[nu]([ital g][sub 9/2])[sup [minus]4]). No evidence for parity doublets is found in [sup 217]At.

• OSTI ID: 6403414
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
ASTATINE 217
ASTATINE ISOTOPES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COINCIDENCE METHODS
COUNTING TECHNIQUES
DECAY
ELEMENTARY PARTICLES
ENERGY LEVELS
FERMIONS
FRANCIUM 221
FRANCIUM ISOTOPES
HADRONS
HEAVY NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MILLISEC LIVING RADIOISOTOPES
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS