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

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.1540· OSTI ID:6545758

Toukan, K A ^[1]; Debus, K; Kaeppeler, F ^[2]; Reffo, G ^[3]

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1. College of Engineering and Technology, The University of Jordan, Amman (Jordan)
2. Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik, Postfach 3640 D-76021 Karlsruhe (Germany)
3. ENEA, Laboratorio Dati Nucleari, Viale Ercolani 8, I-40138 Bologna (Italy)

The neutron capture cross sections of [sup 146,148,150]Nd have been determined relative to that of gold by means of the activation method. The samples were irradiated in a quasistellar neutron spectrum for [ital kT]=25 keV using the [sup 7]Li([ital p],[ital n])[sup 7]Be 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 [sup 147]Nd, [sup 147,148,149]Pm, and [sup 151]Sm, which act as branching points in the [ital s]-process path. Based on these results, the [ital 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 [ital s]-abundances are also used for a discussion of [ital r]- and [ital p]-process residuals.

• OSTI ID: 6545758
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:3; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOTOPES
NEODYMIUM 146
NEODYMIUM ISOTOPES
NEUTRON SPECTRA
NEUTRONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PROMETHIUM 147
PROMETHIUM ISOTOPES
R PROCESS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
S PROCESS
SAMARIUM 151
SAMARIUM ISOTOPES
SPECTRA
STABLE ISOTOPES
STAR EVOLUTION
STELLAR ACTIVITY
YEARS LIVING RADIOISOTOPES