Measurement of neutron capture on 50Ti at thermonuclear energies

Details Measurement of neutron capture on 50Ti at thermonuclear energies Measurement of neutron capture on 50Ti at thermonuclear energies

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phrvc..60e4613s&link_type=abstract

Physical Review C (Nuclear Physics), Volume 60, Issue 5, November 1999, id. 054613

Physics

Nuclear Physics

1

Radiative Capture, Direct Reactions, 39<=A<=58

Scientific paper

At the Karlsruhe and Tübingen 3.75 MV Van de Graaff accelerators the thermonuclear 50Ti(n,γ)51Ti(5.8 min) cross section was measured by the fast cyclic activation technique via the 320.852 and 928.65 keV γ-ray lines of the 51Ti decay. Metallic Ti samples of natural isotopic composition and samples of TiO2 enriched in 50Ti by 67.53% were irradiated between two gold foils which served as capture standards. The capture cross section was measured at the neutron energies of 25, 30, 52, and 145 keV, respectively. The direct capture cross section was determined to be 0.387+/-0.011 mb at 30 keV. We found evidence for a bound state s-wave resonance with an estimated radiative width of 0.34 eV which destructively interferes with direct capture. The strength of a suggested s-wave resonance at 146.8 keV was determined. The present data served to calculate, in addition to the directly measured Maxwellian averaged capture cross sections at 25 and 52 keV, an improved stellar 50Ti(n,γ)51Ti rate in the thermonuclear energy region from 1 to 250 keV. The new stellar rate leads at low temperatures to much higher values than the previously recommended rate; e.g., at kT=8 keV the increase amounts to about 50%. The new reaction rate therefore reduces the abundance of 50Ti due to s processing in asymptotic giant branch stars.

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