ALPHA-DECAY STUDIES OF PROTACTINIUM ISOTOPES (thesis)
The alpha decay of Pa/sup 231/, Pa/sup 229/, Pa/sup 227/, and Ac/sup 223/ w as studied by an alpha-particle ---gamma-ray coincidence technique. A 180 deg double-focusing spectrograph or goldsilicon solid-state detectors for alpha analysis and a sodium iodide (Tl-activated) scintillation crystals for gamma-ray detection were used. The ground states of Pa/sup 227/ and Pa/sup 229/ are shown to be populated by 5.46- and 5.73-Mev alpha particles, respectively. The rotational bands populated in the decay of Pa/sup 231/ are interpreted as being based on octupole vibrational levels predicted by the Bohr -Mottelson strong- coupling model. Modified decay schemes are presented. It is suggested that in odd-proton nuclei, the permanent nuclear deformation starts closer to the closed shell than in the even-even nuclei. A new alpha group at 5.47 Mev is noted in the alpha decay of Ac/sup 233/. No rotational structure is observed in the levels populated. Evidence is presented for the presence of two additional levels populated in the alpha decay of Pa/sup 231/. 40 references. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab. and California. Univ., Berkeley. Dept. of Chemistry
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-18-009322
- OSTI ID:
- 4080328
- Report Number(s):
- UCRL-11082
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACTINIUM 223
ACTIVATION
ALPHA DECAY
ANGULAR DISTRIBUTION
BIBLIOGRAPHY
COINCIDENCE METHODS
COLLECTIVE MODEL
CRYSTAL COUNTERS
DECAY
ENERGY LEVELS
GAMMA RADIATION
GOLD
INTERACTIONS
LENSES
NILSSON- MOTTELSON MODEL
NUCLEAR MODELS
PHYSICS
PROTACTINIUM 223
PROTACTINIUM 227
PROTACTINIUM 229
PROTACTINIUM 231
ROTATION
SILICON
SODIUM IODIDES
SPECTRA
SPECTROMETERS
STRONG INTERACTIONS
THALLIUM
ACTIVATION
ALPHA DECAY
ANGULAR DISTRIBUTION
BIBLIOGRAPHY
COINCIDENCE METHODS
COLLECTIVE MODEL
CRYSTAL COUNTERS
DECAY
ENERGY LEVELS
GAMMA RADIATION
GOLD
INTERACTIONS
LENSES
NILSSON- MOTTELSON MODEL
NUCLEAR MODELS
PHYSICS
PROTACTINIUM 223
PROTACTINIUM 227
PROTACTINIUM 229
PROTACTINIUM 231
ROTATION
SILICON
SODIUM IODIDES
SPECTRA
SPECTROMETERS
STRONG INTERACTIONS
THALLIUM