beta. -decays of /sup 180/Hf/sup m/ and /sup 180/Lu and the origin of /sup 180/Ta

Conference · Fri Dec 31 23:00:00 EST 1982

OSTI ID:5890401

Norman, E B; Kellogg, S E

We are interested in determining the nucleosynthetic mechanism responsible for the production of the naturally occurring isomer, /sup 180/Ta. An attractive idea is the suggestion by Beer and Ward that /sup 180/Ta may be produced in the standard s- and r-processes through previously undetected ..beta..-decay branches of /sup 180/Hf/sup m/ and /sup 180/Lu. The 5.5 hour, J/sup ..pi../=8/sup -/ /sup 180/Hf isomer lies 204 keV above the long-lived J/sup ..pi../=9/sup -/ isomer in /sup 180/Ta; therefore an allowed Gammow-Teller ..beta..-transition should compete with the K-inhibited electromagnetic decays to the ground state rotational band of /sup 180/Hf. The /sup 180/Hf/sup m/ branching ratio to /sup 180/Ta, f/sub ..beta../, need only be 3.1% to account for the /sup 180/Ta abundance by the s-process alone, while log-ft considerations predict a range of from 0.14% to 22%.

• Research Organization: Washington Univ., Seattle (USA). Nuclear Physics Lab.
• DOE Contract Number: AC06-81ER40048
• OSTI ID: 5890401
• Report Number(s): DOE/ER/40048-65; CONF-8306114-1; ON: DE83015733
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DATA
DECAY
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
HAFNIUM 180
HAFNIUM ISOTOPES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LUTETIUM 180
LUTETIUM ISOTOPES
NUCLEI
NUCLEOSYNTHESIS
NUMERICAL DATA
ODD-ODD NUCLEI
R PROCESS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
S PROCESS
STABLE ISOTOPES
STAR EVOLUTION
TANTALUM 180
TANTALUM ISOTOPES