Neutron-capture cross sections for osmium isotopes and the age of the universe
Journal Article
·
· Phys. Rev., C; (United States)
The neutron-capture cross sections for /sup 186,187,188,189,190,192/Os have been measured by the neutron-time-of-flight technique from 0.5 eV to 150 keV. Nuclear level spacings were extracted from the low-energy (resonance-region) data below approx.1 keV, and average cross sections from the data above 1 keV. The ratio of the Maxwellian-weighted average cross sections for /sup 186/Os and /sup 187/Os near 30 keV is a vital parameter for the determination of the duration of nucleosynthesis prior to the formation of the solar system, and thus for the determination of the age of the universe by the nuclear-dating technique. The present result of 10.8/sup +1.4//sub -2.2/ x 10/sup 9/ yr for the duration of nucleosynthesis is in concordance with the value obtained from U-Th dating. The result for the age of the universe (17 +- 3 x 10/sup 9/ yr) agrees with the value obtained from the globular-cluster method, but clearly exceeds the most recent determination of the Hubble time.
- Research Organization:
- Lawrence Livermore Laboratory, University of California, Livermore, California 94550
- OSTI ID:
- 6788788
- Journal Information:
- Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:4; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
/sup 186,187,188/Os(n,. gamma. ) cross sections and galactic nucleosynthesis
Neutron physics of the Re/Os clock. I. Measurement of the (n, γ) cross sections of 186,187,188Os at the CERN n_TOF facility
Neutron physics of the Re/Os clock. I. Measurement of the (n,gamma) cross sections of {sup 186,187,188}Os at the CERN n{sub T}OF facility
Journal Article
·
Thu Jan 31 23:00:00 EST 1980
· Phys. Rev., C; (United States)
·
OSTI ID:5727378
Neutron physics of the Re/Os clock. I. Measurement of the (n, γ) cross sections of 186,187,188Os at the CERN n_TOF facility
Journal Article
·
Thu Jul 15 00:00:00 EDT 2010
· Physical Review. C, Nuclear Physics
·
OSTI ID:1023345
Neutron physics of the Re/Os clock. I. Measurement of the (n,gamma) cross sections of {sup 186,187,188}Os at the CERN n{sub T}OF facility
Journal Article
·
Thu Jul 15 00:00:00 EDT 2010
· Physical Review. C, Nuclear Physics
·
OSTI ID:21389230
Related Subjects
640106 -- Astrophysics & Cosmology-- Cosmology
651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651925 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
AGE ESTIMATION
BARYON REACTIONS
CAPTURE
COSMOLOGY
CROSS SECTIONS
DATA
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
ISOTOPES
KEV RANGE
LINEAR ACCELERATORS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
OSMIUM ISOTOPES
TIME-OF-FLIGHT METHOD
UNIVERSE
651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651925 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
AGE ESTIMATION
BARYON REACTIONS
CAPTURE
COSMOLOGY
CROSS SECTIONS
DATA
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
ISOTOPES
KEV RANGE
LINEAR ACCELERATORS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
OSMIUM ISOTOPES
TIME-OF-FLIGHT METHOD
UNIVERSE