Neutron scattering from Os isotopes at 60 keV and Re-Os nucleochronology

Neutron elastic and inelastic scattering cross sections have been measured for 60.5 keV neutrons incident on /sup 187,188/Os. For /sup 187/Os the cross section for elastic scattering is 11 b and for inelastic scattering to the 9.75-keV level it is 1.13 b. These results and other scattering propertie...

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Veröffentlicht in:	Phys. Rev. C; (United States) 1983-12, Vol.28 (6), p.2249-2258
Hauptverfasser:	Hershberger, R. L., Macklin, R. L., Balakrishnan, M., Hill, N. W., McEllistrem, M. T.
Format:	Artikel
Sprache:	eng
Schlagworte:	651825 - Nuclear Properties & Reactions, A=150-189, Experimental- Nuclear Reactions & Scattering- (-1987) ABUNDANCE BARYON REACTIONS CAPTURE ELASTIC SCATTERING ENERGY RANGE GALACTIC EVOLUTION HADRON REACTIONS INELASTIC SCATTERING ISOTOPE RATIO KEV RANGE KEV RANGE 10-100 NEUTRON REACTIONS NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUCLEON REACTIONS NUCLEOSYNTHESIS OSMIUM 187 TARGET OSMIUM 188 TARGET PHASE SHIFT SCATTERING SYNTHESIS TARGETS
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Zusammenfassung:	Neutron elastic and inelastic scattering cross sections have been measured for 60.5 keV neutrons incident on /sup 187,188/Os. For /sup 187/Os the cross section for elastic scattering is 11 b and for inelastic scattering to the 9.75-keV level it is 1.13 b. These results and other scattering properties are represented in phase shift and scattering potential analyses, which then allow the prediction of neutron capture by /sup 187/Os nuclei in the 9.75-keV and ground levels. Capture rates thus provided are used in the Re-Os nucleochronology, and lead to a long galactic age, about 18 to 20 Gyr.
ISSN:	0556-2813
DOI:	10.1103/PhysRevC.28.2249