Stellar neutron capture cross sections of Nd, Pm, and Sm isotopes

K. A. Toukan, K. Debus, F. Käppeler, and G. Reffo
Phys. Rev. C 51, 1540 – Published 1 March 1995
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Abstract

The neutron capture cross sections of Nd146,148,150 have been determined relative to that of gold by means of the activation method. The samples were irradiated in a quasistellar neutron spectrum for kT=25 keV using the Li7(p,n)7Be 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 6%, which represents a considerable improvement compared to previous measurements. These data are complemented by a new set of calculated cross sections for the unstable isotopes Nd147, Pm147,148,149, and Sm151, which act as branching points in the s-process path. Based on these results, the s-process flow in the Nd-Pm-Sm region is discussed with respect to the neutron density during stellar helium burning and to isotopic anomalies in meteorites. The updated s-abundances are also used for a discussion of r- and p-process residuals.

  • Received 28 September 1994

DOI:https://doi.org/10.1103/PhysRevC.51.1540

©1995 American Physical Society

Authors & Affiliations

K. A. Toukan

  • College of Engineering and Technology, The University of Jordan, Amman, Jordan

K. Debus and F. Käppeler

  • Kernforschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640 D-76021 Karlsruhe, Germany

G. Reffo

  • ENEA, Laboratorio Dati Nucleari, Viale Ercolani 8, I-40138 Bologna, Italy

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Issue

Vol. 51, Iss. 3 — March 1995

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