Neutron physics of the Re/Os clock. II. The (n,n{sup '}) cross section of {sup 187}Os at 30 keV neutron energy

Journal Article · Thu Jul 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.015803· OSTI ID:21389231

Mosconi, M; Heil, M; Kaeppeler, F; Plag, R; Mengoni, A ^[1]

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1. Karlsruhe Institute of Technology (KIT), Campus Nord, Institut fuer Kernphysik, D-76021 Karlsruhe (Germany)

The inelastic neutron-scattering cross section of {sup 187}Os has been determined in a time-of-flight experiment at the Karlsruhe 3.7-MV Van de Graaff accelerator. An almost monoenergetic beam of 30-keV neutrons was produced at the threshold of the {sup 7}Li(p,n){sup 7}Be reaction. Information on the inelastic channel is required for reliable calculations of the so-called stellar enhancement factor, by which the laboratory cross section of {sup 187}Os must be corrected in order to account for the thermal population of low-lying excited states at the temperatures of s-process nucleosynthesis, in particular of the important state at 9.75 keV. This correction represents a crucial step in the interpretation of the {sup 187}Os/{sup 187}Re pair as a cosmochronometer.

• OSTI ID: 21389231
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ALKALINE EARTH ISOTOPES
BARYON REACTIONS
BARYONS
BEAMS
BERYLLIUM 7
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COHERENT SCATTERING
CORRECTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DIFFRACTION
DIMENSIONLESS NUMBERS
ELECTRON CAPTURE RADIOISOTOPES
ELECTROSTATIC ACCELERATORS
ELEMENTARY PARTICLES
EMISSION
ENERGY LEVELS
ENERGY RANGE
EVEN-ODD NUCLEI
EVOLUTION
EXCITED STATES
FERMIONS
HADRON REACTIONS
HADRONS
HEAVY NUCLEI
INELASTIC SCATTERING
ISOTOPE RATIO
ISOTOPES
KEV RANGE
KEV RANGE 10-100
LIGHT NUCLEI
LITHIUM 7 TARGET
NEUTRON DIFFRACTION
NEUTRON EMISSION
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUCLEOSYNTHESIS
ODD-EVEN NUCLEI
OSMIUM 187
OSMIUM ISOTOPES
PROTON REACTIONS
RADIOISOTOPES
RHENIUM 187
RHENIUM ISOTOPES
S PROCESS
SCATTERING
STABLE ISOTOPES
STAR EVOLUTION
SYNTHESIS
TARGETS
TIME-OF-FLIGHT METHOD
VAN DE GRAAFF ACCELERATORS
YEARS LIVING RADIOISOTOPES