Neutron capture of 46Ca at thermonuclear energies

Details Neutron capture of 46Ca at thermonuclear energies Neutron capture of 46Ca at thermonuclear energies

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phrvc..59.3410m&link_type=abstract

Physical Review C (Nuclear Physics), Volume 59, Issue 6, June 1999, pp.3410-3417

Physics

Nuclear Physics

2

Radiative Capture, Resonance Reactions, Hydrostatic Stellar Nucleosynthesis

Scientific paper

The measurement of the neutron capture reaction 46Ca(n,γ)47Ca is of astrophysical interest, because 46Ca is bypassed by charged-particle reactions. The nucleus 46Ca is produced and destroyed by neutron-induced nucleosynthesis in hydrostatic helium, carbon, and neon burning through the reaction chain 45Ca(n,γ)46Ca(n,γ)47Ca. At the Karlsruhe and Tübingen 3.75 MV Van de Graaff accelerators the thermonuclear 46Ca(n,γ)47Ca(4.54 d) cross section was measured by the activation technique via the 1297.09 keV γ-ray line of the 47Ca decay. Samples of CaCO3 enriched in 46Ca by 5% were irradiated between two gold foils which served as capture standards using the 7Li(p,n) and T(p,n) reactions. The capture cross section was measured at the mean neutron energies 30, 104, 149, 180, and 215 keV, respectively. Maxwellian averaged capture cross sections were measured at the quasithermal neutron energies kT=25 and 52 keV, respectively. It was found that the 46Ca(n,γ)47Ca cross section in the thermonuclear energy region and at thermal energy is dominated by an s-wave resonance at 28.4 keV with a neutron width Γn=(17.4+3.6-2.8) keV and a radiation width Γγ=(2.4+/-0.3) eV. The stellar reaction rate is determined in the temperature range from kT=1 to 250 keV and is compared with previous investigations using Hauser-Feshbach calculations or experimental cross section data. The astrophysical consequences of the new stellar reaction rate with respect to the nucleosynthetic abundance of 46Ca are discussed.

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