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Observation of /sup 149/Tm decay to /sup 149/Er levels and. beta. -delayed proton emission

Journal Article · · Phys. Rev. C; (United States)
; ; ; ;

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), Journal Name: Phys. Rev. C; (United States) Vol. 36:2; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYONS
BETA DECAY
BETA-PLUS DECAY
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DATA
DECAY
DELAYED PROTONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
ERBIUM 149
ERBIUM ISOTOPES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
GAMMA SPECTRA
HADRONS
HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MATHEMATICAL MODELS
MOLYBDENUM 94 TARGET
NICKEL 58 REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROTONS
RADIATIONS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SHELL MODELS
SPECTRA
SPIN
TARGETS
THULIUM 149
THULIUM ISOTOPES
X RADIATION