Neutron capture cross section of /sup 197/Au: A standard for stellar nucleosynthesis

Journal Article · Mon Feb 01 04:00:00 EST 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.37.595· OSTI ID:5710091

Ratynski, W; Kaeppeler, F

We have measured the neutron capture cross section of gold using the /sup 7/Li(p,n)/sup 7/Be reaction for neutron production. This reaction not only provides the integrated neutron flux via the /sup 7/Be activity of the target, but also allows for the simulation of a Maxwellian neutron energy spectrum at kT = 25 keV. As this spectrum is emitted in a forward cone of 120/sup 0/ opening angle, the cross section can be measured in good geometry and independent of any other standard. Systematic uncertainties were studied experimentally in a series of activations. The final stellar cross section at kT = 25 keV was found to be 648 +- 10 mb, and extrapolation to the common s-process temperature kT = 30 keV yields 582 +- 9 mb. This result is used for renormalization of a number of cross sections which had been measured relative to gold.

• Research Organization: Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik, D-7500 Karlsruhe, Federal Republic of Germany
• OSTI ID: 5710091
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 37:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
651920* -- Nuclear Properties & Reactions
A=190-219
Experimental
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BOLTZMANN STATISTICS
CAPTURE
CENTER-OF-MASS SYSTEM
CROSS SECTIONS
DATA
EMISSION
EXPERIMENTAL DATA
GOLD 197 TARGET
HADRON REACTIONS
INFORMATION
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
RENORMALIZATION
RESONANCE
STARS
SYNTHESIS
TARGETS