12C(α,γ)16O Capture Cross Section Below 3.2 MeV

Details 12C(α,γ)16O Capture Cross Section Below 3.2 MeV 12C(α,γ)16O Capture Cross Section Below 3.2 MeV

Jul 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970phrvc...2...63j&link_type=abstract

Physical Review C, vol. 2, Issue 1, pp. 63-69

Astronomy and Astrophysics

Astrophysics

15

Scientific paper

The 12C(α,γ)16O capture cross section was measured for α-particle energies between 1.86 MeV (σ=1.1+/-0.4 nb) and 3.11 MeV (σ=29+/-4 nb) using a pulsed 4He+ beam from the ORNL 6-MV Van de Graaff accelerator and a 23- by 30-cm NaI(Tl) crystal viewed by six matched, bialkali photomultiplier tubes. An upper limit was obtained for the capture cross section at Eα=1.6 MeV. The over-all time resolution (full width at half maximum) of the system for 8-10-MeV pulses due to γ rays is 2.7 nsec. Enriched (99.94%) 12C targets ranging in thickness from 98 to 178 μg/cm2 were used. Pulses resulting from fast neutrons [from the 13C(α,n)16O reaction] interacting with the NaI(Tl) crystal were further separated from true γ pulses through the use of a new technique based on rise-time distribution differences of the respective neutron- and γ-ray-produced pulses. The face of the crystal (shielded with a 10.2 cm thickness of 6LiH) was 12.2 cm from the target. The astrophysical significance of this reaction in the helium-burning sequence of stellar nucleosynthesis is also discussed.

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