KeV neutron capture cross sections for the s-process isotopes of Se, Br, and Kr and the abundance of krypton in the solar system

Conference · Mon Sep 01 00:00:00 EDT 1980 · NBS Spec. Publ. (U.S.); (United States)

OSTI ID:6045494

Leugers, B ^[1]; Kaeppeler, F; Fabbri, F; Reffo, G

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1. Kernforschungszentrum Karlsruhe GmbH, Germany

The neutron capture cross sections of natural Kr, /sup 84/Kr and three samples enriched in /sup 83/Kr, /sup 82/Kr, and /sup 80/Kr were measured with the time-of-flight technique in the energy range between 3 and 250 keV. The energy resolution was 1.5 ns/m. Capture gamma rays were detected by two C/sub 6/D/sub 6/ detectors using the pulse height weighting technique off-line. From these data, Maxwellian averaged cross sections < sigma v >/v/sub T/ have been determined for all stable Kr isotopes with an accuracy of typically 10 %, except for /sup 78/Kr and /sup 86/Kr, where the uncertainties are 30 % and 100 %, respectively. In addition, the cross sections for all s-process isotopes of Se, Br, and Kr were calculated with a Hauser Feshbach formalism with width fluctuation corrections, using carefully evaluated level densities and radiative decay widths. In the calculations all available experimental information about these cross sections was considered to include the local behavior of parameters. With this improved set of cross sections, the solar system abundance of Kr was determined from s-process systematics.

• OSTI ID: 6045494
• Report Number(s): CONF-791058-
• Journal Information: NBS Spec. Publ. (U.S.); (United States), Vol. 594; Conference: International conference on nuclear cross sections for technology, Knoxville, TN, USA, 22 Oct 1979
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BROMINE ISOTOPES
NEUTRON REACTIONS
KRYPTON ISOTOPES
CAPTURE
S PROCESS
SELENIUM ISOTOPES
SOLAR SYSTEM
CHEMICAL COMPOSITION
ABUNDANCE
CROSS SECTIONS
EXPERIMENTAL DATA
HAUSER-FESHBACH THEORY
KRYPTON 80 TARGET
KRYPTON 82 TARGET
KRYPTON 83 TARGET
KRYPTON 84 TARGET
NUCLEOSYNTHESIS
THEORETICAL DATA
BARYON REACTIONS
DATA
HADRON REACTIONS
INFORMATION
ISOTOPES
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
NUMERICAL DATA
STAR EVOLUTION
TARGETS
651625* - Nuclear Properties &amp; Reactions
A=59-89
Experimental- Nuclear Reactions &amp; Scattering- (-1987)
651615 - Nuclear Properties &amp; Reactions
A=59-89
Theoretical- Nuclear Reactions &amp; Scattering- (-1987)
640102 - Astrophysics &amp; Cosmology- Stars &amp; Quasi-Stellar
Radio &amp; X-Ray Sources