Sr-88 and Y-89 - The s-process at magic neutron number N = 50

Details Sr-88 and Y-89 - The s-process at magic neutron number N = 50 Sr-88 and Y-89 - The s-process at magic neutron number N = 50

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..348k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, May 20, 1990, p. 348-356.

Astronomy and Astrophysics

Astrophysics

16

Neutrons, Nuclear Astrophysics, Stellar Physics, Strontium 88, Yttrium Isotopes, Absorption Cross Sections, Neutron Spectra, Nuclear Fusion

Scientific paper

The neutron capture cross sections of Sr-88 and Y-89 were measured in a quasi-stellar neutron spectrum for kT = 25 keV via the activation method. Relevant systematic uncertainties were determined experimentally by repeated activations under different conditions and with different samples. Gold was used as a cross section standard. The resulting stellar cross sections for kT = 30 keV are 6.13 + or - 0.18 mbarn for Sr-88 and 19.0 + or - 0.6 mbarn for Y-89. The partial cross section Sr-86(n, gamma) Sr-87m was measured to 48.1 + or - 1.2 mbarn. Compared to previous data, the associated uncertainties are reduced by factors of 3 and 5, respectively. The implications for s-process nucleosynthesis around magic neutron number N = 50 are discussed in the light of new information on neutron density and temperature.

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