Level structure and reflection asymmetry in [sup 227]Th

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

DOI:https://doi.org/10.1103/PhysRevC.51.1199· OSTI ID:6403396

Liang, C F; Paris, P ^[1]; Sheline, R K ^[2]; Nosek, D; Kvasil, J ^[3]

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1. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, IN2P3, Centre National de la Recherche Scientifique, Batiment 104, 91405 Campus Orsay (France)
2. Chemistry and Physics Departments, Florida State University, Tallahassee, Florida 32306 (United States)
3. Department of Nuclear Physics, Charles University, V Holesovickach 2, 18000 Prague 8 (Czech Republic)

The level structure of [sup 227]Th has been studied using the electron capture decay of [sup 227]Pa and the [beta][sup [minus]] decay of [sup 227]Ac to give a total of 20 levels where only four were previously known. This level structure then makes possible a more complete interpretation of the recently studied [sup 231]U alpha decay into [sup 227]Th. The level structure can be interpreted using both strong coupling and intermediate coupling models in terms of [ital K]=1/2[sup [plus minus]],[ital K]=3/2[sup [plus minus]], and more tentative [ital K]=5/2[sup [plus minus]] parity double bands which implies that [sup 227]Th has reflection asymmetry. Futhermore, the detailed interpretation of the level structure of [sup 227]Th solves the long standing problem of the ground state spin-parity of [sup 227]Th which is shown to be 1/2[sup +].

• OSTI ID: 6403396
• 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

Related Subjects

663120* -- Nuclear Structure Models & Methods-- (1992-)
663210 -- Ground-State Radioactivity-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIUM 227
ACTINIUM ISOTOPES
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
ASYMMETRY
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-ODD NUCLEI
GROUND STATES
HEAVY NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOTOPES
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NUCLEAR DECAY
NUCLEI
ODD-EVEN NUCLEI
PARITY
PARTICLE MODELS
PARTICLE PROPERTIES
PROTACTINIUM 227
PROTACTINIUM ISOTOPES
RADIOISOTOPES
REFLECTION
SPIN
STRONG-COUPLING MODEL
THORIUM 227
THORIUM ISOTOPES
URANIUM 231
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES