22Ne(α,n)25Mg: The Key Neutron Source in Massive Stars

Details 22Ne(α,n)25Mg: The Key Neutron Source in Massive Stars 22Ne(α,n)25Mg: The Key Neutron Source in Massive Stars

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvl..87t2501j&link_type=abstract

Physical Review Letters, vol. 87, Issue 20, id. 202501

Astronomy and Astrophysics

Astrophysics

46

Scientific paper

The excitation function of the reaction 22Ne(α,n)25Mg, the key neutron source in the astrophysical s process in massive stars, has been determined from threshold at Eα = 570 up to 1450 keV with an experimental sensitivity of 10-11 b. For all resonances in this energy range new resonance parameters have been measured. For a possible resonance at about 635 keV a new upper limit ωγ<60 neV for the strength was obtained. Based on the new data, improved reaction rates were calculated as a function of temperature. The new uncertainty limits are considerably smaller than in previous determinations, ruling out the large enhancement factors, up to 500, assumed in some stellar model calculations.

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