The stellar neutron capture cross sections of Zr-94 and Zr-96

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168243· OSTI ID:6904959

Toukan, K A; Kaeppeler, F ^[1]

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1. Kernforschungszentrum Karlsruhe GmbH (Germany, F.R.)

The neutron capture cross sections of Zr-94 and Zr-96 have been determined relative to that of gold by means of the activation method. The samples were irradiated in a quasi-stellar neutron spectrum for kT = 25 keV using the Li-7(p, n)Be-7 reaction near threshold. Variation of the experimental conditions in different activations and the use of different samples allowed for the reliable determination of corrections and the evaluation of systematic uncertainties. The resulting stellar cross sections can be given with uncertainties around 4 percent, considerably lower than previous data. The new data made it possible for the first time to deduce the s-process neutron density from the branching at Zr-95. 25 refs.

• OSTI ID: 6904959
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 348; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYON REACTIONS
CAPTURE
CROSS SECTIONS
GIANT STARS
HADRON REACTIONS
ISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
RED GIANT STARS
S PROCESS
STAR EVOLUTION
STARS
ZIRCONIUM ISOTOPES