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/sup 178,179,180/Hf and /sup 180/Ta(n,. gamma. ) cross sections and their contribution to stellar nucleosynthesis

Journal Article · · Phys. Rev. C; (United States)
;
The neutron capture cross sections of /sup 178,179,180/Hf were measured in the energy range 2.6 keV to 2 MeV. The average capture cross sections were calculated and fitted in terms of strength functions. Resonance parameters for the observed resonances below 10 keV were determined by a shape analysis. Maxwellian averaged capture cross sections were computed for thermal energies kT between 5 and 100 keV. The cross sections for kT = 30 keV were used to determine the population probability of the 8/sup -/ isomeric level in /sup 180/Hf by neutron capture as (1.24 +- 0.06) % and the r-process abundance of /sup 180/Hf as 0.0290 (Si equivalent10/sup 6/). These quantities served to analyze s- and r-process nucleosynthesis of /sup 180/Ta.
Research Organization:
Kernforschungszentrum Karlsruhe GmbH, Institut fuer Angewandte Kernphysik, D-7500 Karlsruhe, Federal Republic of Germany
OSTI ID:
7059983
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 26:4; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
651823 -- Nuclear Properties & Reactions
A=150-189
Experimental-- Energy Levels & Transitions-- (-1987)
651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CAPTURE
CROSS SECTIONS
DATA
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FUNCTIONS
HADRON REACTIONS
HAFNIUM 178 TARGET
HAFNIUM 179 TARGET
HAFNIUM 180
HAFNIUM 180 TARGET
HAFNIUM ISOTOPES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
KEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
PROBABILITY
R PROCESS
RADIOISOTOPES
S PROCESS
STABLE ISOTOPES
STAR EVOLUTION
STARS
STRENGTH FUNCTIONS
TANTALUM 180 TARGET
TARGETS