Stellar neutron capture on 180 Tam . II. Defining the s -process contribution to nature's rarest isotope

Details Stellar neutron capture on 180 Tam . II. Defining the s -process contribution to nature's rarest isotope Stellar neutron capture on 180 Tam . II. Defining the s -process contribution to nature's rarest isotope

Publishing date

May 2004

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvc..69e5802k&link_type=abstract

Journals

Physical Review C, vol. 69, Issue 5, id. 055802

Science

Physics

Additional info 2

8

Additional info 3

Radiative Capture, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Type

Scientific paper

Abstract

The contribution of the slow neutron capture process ( s process) to the solar 180 Tam abundance has been investigated on the basis of new experimental information. Measured neutron capture cross sections of 180 Tam and the corresponding Maxwellian averaged ( n,γ ) rates were important for defining the s abundance of 180 Tam , and the result of a recent photoactivation experiment was providing an estimate of its half-life at the temperatures of the s -process site. Following the s -process network with stellar evolutionary models from the premain sequence through the asymptotic giant branch phase, it was found that the produced 180 Tam survives the high temperatures during He shell flashes because of the fast convective mixing, which provides an efficient means for transporting freshly synthesized matter into cooler, outer zones. Accordingly, 180 Tam appears to be predominantly of s -process origin.

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