LEVELS IN Th$sup 228$ EXCITED IN THE ELECTRON CAPTURE DECAY OF Pa$sup 22$$sup 8$

Journal Article · Wed Nov 30 23:00:00 EST 1960 · Nuclear Phys.

DOI:https://doi.org/10.1016/0029-5582(60)90066-3· OSTI ID:4087132

Arbman, E; Bjornholm, S; Nielsen, O B

Pa/sup 228/ (22h) was produced by (p,5n) reactions on Th/sup 232/ The decay was studied by means of a double-focusing highresolution beta spectrometer, a six-gap high-transmission beta spectrometer, scintillation spectometers, and coincidence techniques. More than 200 conversion lines were found. Of these, 153 were ascribed to the Pa/sup 228/ decay on the basis of their half lives and assigned to 72 gamma transitions in Th/sup 22/ /sup 6/. Numerous coincidence relations between conversion lines and gamma rays were measured. A decay scheme comprising 22 excited states, ranging from 57.5 to 1943 kev, is presented and discussed with respect to the quantum numbers (K, I, pi ). In addition to the ground-state rotational band, the level structure indicates the presence of 3 or 4 rotational bands, built on intrinsically excited states. The possible collective vibrational character of the lower lying intrinsic states is discussed. Theoretical branching ratios and selection bands associated with the quantum number K are compared with experiment and discussed. (auth)

• Research Organization: Univ. of Copenhagen; and Univ. of Uppsala
• NSA Number: NSA-15-010026
• OSTI ID: 4087132
• Journal Information: Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 21
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BETA DETECTION
BETA SPECTROMETERS
BRANCHING RATIO
CAPTURE
COINCIDENCE METHODS
COLLECTIVE MODEL
DECAY
ELECTRONS
ENERGY LEVELS
EXCITATION
GAMMA DETECTION
GAMMA RADIATION
HALF-LIFE
INTERNAL CONVERSION
MAGNETIC FIELDS
MEASURED VALUES
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
OSCILLATIONS
PARITY
PHYSICS
PROTONS
ROTATION
SCINTILLATION COUNTERS
SPECTRA
SPIN
THORIUM 228
THORIUM 232