Published 1983 | Version v1
Report Restricted

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

Creators

Description

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

Availability note (English)

MF available from INIS under the Report Number; Available from NTIS, PC A02/MF A01; 1 as DE83015733.

Files

Restricted

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Additional details

Publishing Information

Imprint Pagination
3 p.
Report number
DOE/ER/40048--65

Conference

Title
Workshop on nuclear astrophysics.
Dates
6-10 Jun 1983.
Place
Bad Wiessee (Germany, F.R.).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
15023443
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
BETA DECAY; EXPERIMENTAL DATA; HAFNIUM 180; LUTETIUM 180; NUCLEOSYNTHESIS; R PROCESS; S PROCESS; TANTALUM 180
Descriptors DEC
BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; DATA; DECAY; ELECTRON CAPTURE RADIOISOTOPES; EVEN-EVEN NUCLEI; HAFNIUM ISOTOPES; HOURS LIVING RADIOISOTOPES; INFORMATION; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LUTETIUM ISOTOPES; NUCLEAR DECAY; NUCLEI; NUMERICAL DATA; ODD-ODD NUCLEI; RADIOISOTOPES; RARE EARTH NUCLEI; STABLE ISOTOPES; STAR EVOLUTION; SYNTHESIS; TANTALUM ISOTOPES

Optional Information

Secondary number(s)
CONF-8306114--1.