Beta-delayed proton decay in the lanthanide region
A total of 24 new ..beta..-delayed proton precursors and several new decay branches in the region of 56 < Z < 72 and N < 82 have been identified with the OASIS on-line mass separator facility at the SuperHILAC in Berkeley. Proton spectra and halflives were measured for all precursors. Additional properties determined for many of the isotopes include spins and parities of the precursors, final state feedings, proton branching ratios, (Q/sub EC/-S/sub p/) energy differences, and new levels in the proton decay daughters. Mixed ..beta..-delayed proton decay from precursor isomers and ground states has been observed. The proton decay has been compared to statistical model calculations using Gamow-Teller (GT) ..beta..-strength functions obtained from RPA calculations with Nilsson model wave functions. For the N = 81 precursors /sup 151/Yb, /sup 149/Er, and /sup 147/Dy, pronounced structure in the proton spectra has been observed. An interpretation of this structure in the framework of ''doorway'' states is proposed. 25 refs., 6 figs., 1 tab.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA); Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5801478
- Report Number(s):
- LBL-23929; CONF-870970-8; ON: DE88002232
- Country of Publication:
- United States
- Language:
- English
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651520 -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR MOMENTUM
BETA DECAY
BRANCHING RATIO
DATA
DECAY
ENERGY RANGE
EXPERIMENTAL DATA
HALF-LIFE
INFORMATION
ISOTOPES
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NUCLEAR MODELS
NUMERICAL DATA
PROTON DECAY RADIOISOTOPES
PROTON EMISSION DECAY
PROTON SPECTRA
RADIOISOTOPES
SHELL MODELS
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TRANSITION AMPLITUDES
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR MOMENTUM
BETA DECAY
BRANCHING RATIO
DATA
DECAY
ENERGY RANGE
EXPERIMENTAL DATA
HALF-LIFE
INFORMATION
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUMERICAL DATA
PROTON DECAY RADIOISOTOPES
PROTON EMISSION DECAY
PROTON SPECTRA
RADIOISOTOPES
SHELL MODELS
SPECTRA
TRANSITION AMPLITUDES