Neutron-capture nucleosynthesis of neodymium isotopes and the s-process from A = 130 to 150
New measurements of neutron capture cross sections for /sup 142,143,144/Nd are reported. These are combined with other recent measurements and applied to a detailed study of the s-proccess and r-process systematics for A = 130-150 nuclei. The influence of these results on the interpretation of isotopic anomalies observed in acid-insoluble residues and inclusions from the Allende meteorite is also examined. The uncertainties in the s-process sigmaN curve are significantly diminished in the present work, and a fit is obtained which is consistent with all of the s-process-only isotopes in this region. A somewhat larger value than previous determinations is obtained for the mean neutron exposure for heavy nuclei in the s-process, tau/sub 0/ = 0.29-0.35 mb/sup -1/. The derived r-process abundances decrease systematically from the A = 130 peak but exhibit a pronounced odd-even effect. The new results tend to confirm the hypothesis that the isotopic anomalies in materials from the Allende meteorite are the result of an unusual mixture of average solar-system s-process and r-process material, but an odd-even effect may be present in the r-process anomalies of inclusion EK1-4-1.
- Research Organization:
- University of California, Lawrence Livermore National Laboratory
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5852041
- Journal Information:
- Astrophys. J.; (United States), Vol. 286:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEODYMIUM 142 TARGET
NEUTRON REACTIONS
NEODYMIUM 143 TARGET
NEODYMIUM 144 TARGET
NEODYMIUM ISOTOPES
NUCLEOSYNTHESIS
CAPTURE
R PROCESS
S PROCESS
ABUNDANCE
CROSS SECTIONS
METEORITES
NUCLEAR REACTIONS
SOLAR SYSTEM
BARYON REACTIONS
HADRON REACTIONS
NUCLEON REACTIONS
STAR EVOLUTION
SYNTHESIS
TARGETS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
651725 - Nuclear Properties & Reactions
A=90-149
Experimental- Nuclear Reactions & Scattering- (-1987)