Neutron capture cross sections for /sup 86/Sr and /sup 87/Sr at stellar temperatures. Revision 1

Technical Report · Wed Jun 25 04:00:00 EDT 1986

DOI:https://doi.org/10.2172/5610107· OSTI ID:5610107

Bauer, R W; Mathews, G J; Becker, J A; Howe, R E; Ward, R A

Recent work on s-process nucleosynthesis has focused attention on the investigation of capture cross sections for nuclei in the mass region near the N = 50 closed neutron shell. Of special astrophysical interest are (i) the analysis of the s-process branching through /sup 85/Kr as a monitor of stellar neutron density and temperature and (ii) the investigation of the possible chronometric pair /sup 87/Rb-/sup 87/Sr as an independent measure of the age of the galaxy. For both problems the capture cross sections of the two pure s-process nuclei /sup 86/Sr and /sup 87/Sr have to be known to an accuracy of 5% or better. The current investigation of the neutron capture cross sections for /sup 86/Sr and /sup 87/Sr was undertaken to extend recent measurements by Walter and Beer to energies below 3.5 keV, where strong resonances are known to exist, and to explore the discrepancy in the results of the Maxwellian averaged capture cross section of /sup 87/Sr at kT = 30 keV as reported by previous investigators. 9 refs., 1 fig.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5610107
• Report Number(s): UCRL-94158-Rev.1; CONF-860741-1-Rev.1; ON: DE86012354
• Country of Publication: United States
• Language: English

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
651625* -- Nuclear Properties & Reactions
A=59-89
Experimental-- Nuclear Reactions & Scattering-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AGE ESTIMATION
ALKALI METAL ISOTOPES
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA
DAYS LIVING RADIOISOTOPES
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
KEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-ODD NUCLEI
RADIOISOTOPES
RUBIDIUM 86
RUBIDIUM ISOTOPES
S PROCESS
SPECTRA
STAR EVOLUTION
STRONTIUM 86 TARGET
STRONTIUM 87 TARGET
TARGETS
TEMPERATURE DEPENDENCE
ULTRAHIGH TEMPERATURE