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Title: Stellar neutron capture cross sections of the Lu isotopes

Abstract

The neutron capture cross sections of {sup 175}Lu and {sup 176}Lu have been measured in the energy range 3-225 keV at the Karlsruhe 3.7 MV Van de Graaff accelerator. Neutrons were produced via the {sup 7}Li(p,n){sup 7}Be reaction by bombarding metallic Li targets with a pulsed proton beam, and capture events were registered with the Karlsruhe 4{pi} barium fluoride detector. The cross sections were determined relative to the gold standard using isotopically enriched as well as natural lutetium oxide samples. Overall uncertainties of {approx}1% could be achieved in the final cross section ratios to the gold standard, about a factor of 5 smaller than in previous works. Maxwellian averaged neutron capture cross sections were calculated for thermal energies between kT = 8 and 100 keV. These values are systematically larger by {approx}7% than those reported in recent evaluations. These results are of crucial importance for the assessment of the s-process branchings at A 175/176.

Authors:
; ; ;  [1];  [2]
  1. Forschungszentrum Karlsruhe, Institut fuer Kernphysik, Postfach 3640, D-76021 Karlsruhe (Germany)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
20771236
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.73.015807; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BARIUM FLUORIDES; BERYLLIUM 7; BRANCHING RATIO; CAPTURE; CROSS SECTIONS; KEV RANGE; LITHIUM 7 TARGET; LUTETIUM 175; LUTETIUM 176; LUTETIUM OXIDES; NEUTRON REACTIONS; NEUTRONS; PROTON BEAMS; PROTON REACTIONS; S PROCESS

Citation Formats

Wisshak, K., Voss, F., Kaeppeler, F., Kazakov, L., and Institute for Physics and Power Engineering, Obninsk, Kaluga-Region. Stellar neutron capture cross sections of the Lu isotopes. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.015807.
Wisshak, K., Voss, F., Kaeppeler, F., Kazakov, L., & Institute for Physics and Power Engineering, Obninsk, Kaluga-Region. Stellar neutron capture cross sections of the Lu isotopes. United States. doi:10.1103/PhysRevC.73.015807.
Wisshak, K., Voss, F., Kaeppeler, F., Kazakov, L., and Institute for Physics and Power Engineering, Obninsk, Kaluga-Region. Sun . "Stellar neutron capture cross sections of the Lu isotopes". United States. doi:10.1103/PhysRevC.73.015807.
@article{osti_20771236,
title = {Stellar neutron capture cross sections of the Lu isotopes},
author = {Wisshak, K. and Voss, F. and Kaeppeler, F. and Kazakov, L. and Institute for Physics and Power Engineering, Obninsk, Kaluga-Region},
abstractNote = {The neutron capture cross sections of {sup 175}Lu and {sup 176}Lu have been measured in the energy range 3-225 keV at the Karlsruhe 3.7 MV Van de Graaff accelerator. Neutrons were produced via the {sup 7}Li(p,n){sup 7}Be reaction by bombarding metallic Li targets with a pulsed proton beam, and capture events were registered with the Karlsruhe 4{pi} barium fluoride detector. The cross sections were determined relative to the gold standard using isotopically enriched as well as natural lutetium oxide samples. Overall uncertainties of {approx}1% could be achieved in the final cross section ratios to the gold standard, about a factor of 5 smaller than in previous works. Maxwellian averaged neutron capture cross sections were calculated for thermal energies between kT = 8 and 100 keV. These values are systematically larger by {approx}7% than those reported in recent evaluations. These results are of crucial importance for the assessment of the s-process branchings at A 175/176.},
doi = {10.1103/PhysRevC.73.015807},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}