Neutron capture cross sections of /sup 178/,/sup 179/,/sup 180/Hf and the origin of nature's rarest stable isotope /sup 180/Ta
Conference
·
OSTI ID:7079505
The neutron capture cross sections of /sup 178/,/sup 179/,/sup 180/Hf were measured in the energy range 2.6 keV to 2 MeV. The average capture cross sections were derived and fitted in terms of strength functions. Resonance parameters for the observed resonances below 10 keV were determined by shape analysis. Maxwellian-averaged capture cross sections were computed for thermal energies with kT between 5 and 100 keV. The cross sections for kT = 30 keV were used to determine the population probability of the 8- 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 = 10/sup 6/). These quantities served to analyze s- and r-process nucleosynthesis of /sup 180/Ta, nature's rarest stable isotope.
- Research Organization:
- Kernforschungszentrum Karlsruhe G.m.b.H. (Germany, F.R.). Inst. fuer Angewandte Kernphysik 1; Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7079505
- Report Number(s):
- CONF-820942-6; ON: DE82022340
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
HAFNIUM 178 TARGET
HAFNIUM 179 TARGET
HAFNIUM 180 TARGET
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC NUCLEI
ISOTOPES
KEV RANGE
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
ODD-ODD NUCLEI
R PROCESS
RADIOISOTOPES
RESONANCE
S PROCESS
STAR EVOLUTION
TANTALUM 180
TANTALUM ISOTOPES
TARGETS
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
HAFNIUM 178 TARGET
HAFNIUM 179 TARGET
HAFNIUM 180 TARGET
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC NUCLEI
ISOTOPES
KEV RANGE
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
ODD-ODD NUCLEI
R PROCESS
RADIOISOTOPES
RESONANCE
S PROCESS
STAR EVOLUTION
TANTALUM 180
TANTALUM ISOTOPES
TARGETS