Neutron capture cross sections of /sup 178/,/sup 179/,/sup 180/Hf and the origin of nature's rarest stable isotope /sup 180/Ta
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
- Resource Relation:
- Conference: Nuclear data for science and technology international conference, Antwerp, Belgium, 6 Sep 1982
- Country of Publication:
- United States
- Language:
- English
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HAFNIUM 178 TARGET
NEUTRON REACTIONS
HAFNIUM 179 TARGET
HAFNIUM 180 TARGET
CAPTURE
TANTALUM 180
NUCLEOSYNTHESIS
DIFFERENTIAL CROSS SECTIONS
EXPERIMENTAL DATA
ISOMERIC NUCLEI
KEV RANGE
MEV RANGE 01-10
R PROCESS
RESONANCE
S PROCESS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CROSS SECTIONS
DATA
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
HADRON REACTIONS
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEV RANGE
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-ODD NUCLEI
RADIOISOTOPES
STAR EVOLUTION
TANTALUM ISOTOPES
TARGETS
651825* - Nuclear Properties & Reactions
A=150-189
Experimental- Nuclear Reactions & Scattering- (-1987)