First-forbidden 0/sup +/. -->. 0/sup -/,1/sup -/ electron capture of /sup 44/Ti

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.38.1843· OSTI ID:7064409

Alburger, D E; Warburton, E K

/sup 44/Ti(EC)/sup 44/Sc was studied both experimentally and theoretically. The experimental study--motivated by current interest in first-forbidden beta decay--leads to more precise branching ratios for the electron capture decay to the 0/sup -/ and 1/sup -/ levels of /sup 44/Sc as well as to other ancillary results including precision ..gamma..-ray energy determinations, ..gamma..-ray branching ratios from the 146-keV level of /sup 44/Sc, and lifetimes of the 68- and 146-keV excited states of /sup 44/Sc. Beta and gamma decays were considered in a spherical shell model calculation utilizing 0h-4p and 1h-5p model spaces (relative to /sup 40/Ca). The formulae relating non-unique first-forbidden electron capture decay rates to nuclear matrix elements have apparently never before been applied; therefore, the application is discussed in detail. The model predictions are not in very good agreement with experiment. Possible reasons for the poor agreement are discussed. Nevertheless, the 0/sup +/..-->..0/sup -/ decay provides some further evidence for the existence of a large meson enhancement of the ..delta..J = 0 timelike component of the axial current.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 7064409
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 38:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARIUM 133
BARIUM ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
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ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
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GAMMA SPECTRA
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INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIFETIME
MATHEMATICAL MODELS
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MATRIX ELEMENTS
NUCLEAR MODELS
NUCLEI
ODD-ODD NUCLEI
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PARTICLE PROPERTIES
PHASE SPACE
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SCANDIUM 44
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SHELL MODELS
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