Observation of /sup 149/Tm decay to /sup 149/Er levels and. beta. -delayed proton emission
With the use of an on-line isotope separator, /sup 149/Tm (T/sub 1/2/ = 0.9 +- 0.2 s) was identified in /sup 58/Ni bombardments of /sup 94/Mo. Seven ..gamma.. rays were observed to follow the isotope's (..beta../sup +/+electron capture) decay, including the 111.3-keV transition known from /sup 149/Er/sup m/ isomeric decay to be the d/sub 3/2/ (111.3 keV)..-->..s/sub 1/2/ (0.0 keV) ..gamma.. ray in /sup 149/Er. In addition to the previously known levels at 111.3 (d/sub 3/2/) and 741.5 (h/sub 11/2/) keV in /sup 149/Er, our data establish three other excited states, at 907.4 ((5/2/sup +/), 1066.2 ((7/2/sup -/), and 1482.9 ((9/2/sup -/, (11/2/sup -/) keV. Coincidences observed between Er K x rays and protons in the A = 149 mass chain show that /sup 149/Tm is a ..beta..-delayed proton precursor.
- Research Organization:
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6462306
- Journal Information:
- Phys. Rev. C; (United States), Vol. 36:2
- Country of Publication:
- United States
- Language:
- English
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ERBIUM 149
ENERGY LEVELS
THULIUM 149
BETA-PLUS DECAY
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DELAYED PROTONS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
GAMMA SPECTRA
MOLYBDENUM 94 TARGET
NICKEL 58 REACTIONS
PARITY
SHELL MODELS
SPIN
X RADIATION
ANGULAR MOMENTUM
BARYONS
BETA DECAY
CHARGED-PARTICLE REACTIONS
DATA
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ELECTROMAGNETIC RADIATION
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EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
PROTONS
RADIATIONS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SPECTRA
TARGETS
THULIUM ISOTOPES
651720* - Nuclear Properties & Reactions
A=90-149
Experimental