Stellar (n, {gamma}) cross sections for Br and Rb: Matching the weak and main s-process components

Journal Article · Fri Aug 15 04:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.025802· OSTI ID:21192154

Heil, M; Kaeppeler, F; Uberseder, E; Gallino, R; Bisterzo, S; Pignatari, M ^[1]

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1. Forschungszentrum Karlsruhe, Institut fuer Kernphysik, Postfach 3640, D-76021 Karlsruhe (Germany)

The stellar (n, {gamma}) cross sections of {sup 79}Br, {sup 81}Br, {sup 85}Rb, and {sup 87}Rb have been determined by a series of ten activation measurements in a quasistellar neutron spectrum corresponding to a thermal energy of kT = 25 keV. The final uncertainties between 3 and 10% were dominated by the {gamma}-ray intensities in the decay of the respective reaction products. All other uncertainties were significantly reduced through variation of the experimental parameters. The consequences of these results for s-process nucleosynthesis of Br and Rb, and in particular of the local s-only isotopes {sup 80,} {sup 82}Kr and {sup 86,} {sup 87}Sr, are discussed with respect to the branching points at {sup 79}Se and {sup 85}Kr. The contributions of both the main s component from thermally pulsing low mass asymptotic giant branch stars and the weak s component from massive stars are considered in this analysis.

• OSTI ID: 21192154
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMPTOTIC SOLUTIONS
BRANCHING RATIO
BROMINE 79
BROMINE 81
CROSS SECTIONS
GAMMA DECAY
GAMMA RADIATION
KEV RANGE 10-100
KRYPTON 80
KRYPTON 82
KRYPTON 85
MASS
NEUTRON SPECTRA
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
RUBIDIUM 85
RUBIDIUM 87
S PROCESS
SELENIUM 79
STARS
STRONTIUM 86
STRONTIUM 87