Neutron capture in sup 122,123,124 Te: Critical test for s process studies

Journal Article · Fri May 01 00:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.2470· OSTI ID:7043969

Wisshak, K; Voss, F; Kaeppeler, F ^[1]; Reffo, G ^[2]

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1. Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik, D-7500 Karlsruhe (Germany)
2. Comitato Nazionale dell'Energia Nucleare e dell'Energie Alternative, I-40138 Bologna (Italy)

The neutron capture cross sections of {sup 122,123,124,125,126}Te were measured in the energy range from 10 to 200 keV at the Karlsruhe Van de Graaff accelerator using gold as a standard. Neutrons were produced via the {sup 7}Li({ital p},{ital n}){sup 7}Be reaction by bombarding metallic Li targets with a pulsed proton beam. Capture events were registered with the Karlsruhe 4{pi} barium fluoride detector. Several sets of measurements were performed under different experimental conditions to study the systematic uncertainties in detail. The cross section ratios {sigma}(Te)/{sigma}(Au) were determined with an overall uncertainty of {similar to}1%. This is an improvement by about a factor of 5 compared to existing data. Maxwellian-averaged neutron capture cross sections were calculated for thermal energies between {ital kT}=10 and 100 keV by normalizing the cross section shape up to 600 keV neutron energy reported in literature to the present data. These stellar cross sections were used in an {ital s} process analysis. With the classical approach the abundances of the three {ital s} only isotopes {sup 122,123,124}Te could be reproduced within the experimental uncertainties of {similar to}1%. The accuracy of the present data also allowed us to derive constraints for the existing stellar models with respect to the effective neutron density. Furthermore, the {ital p} process abundances for the tellurium isotopes are discussed.

• OSTI ID: 7043969
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CAPTURE
CROSS SECTIONS
ENERGY RANGE
HADRON REACTIONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
S PROCESS
STAR EVOLUTION
SYNTHESIS
TARGETS
TELLURIUM 122 TARGET
TELLURIUM 123 TARGET
TELLURIUM 124 TARGET
TOTAL CROSS SECTIONS