The 12C(α, γ)16O cross section at stellar energies

Details The 12C(α, γ)16O cross section at stellar energies The 12C(α, γ)16O cross section at stellar energies

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nupha.462..385r&link_type=abstract

Nuclear Physics A, Volume 462, Issue 2, p. 385-412.

Physics

Nuclear Physics

82

Nuclear Reactions

Scientific paper

The capture reaction 12C(α, γ)16O has been investigated at E = 0.94 to 2.84 MeV with the use of an intense α beam and implanted 12C targets of high isotopic purity. The studies involved NaI(Tl) crystals and, for the first time, germanium detectors. The measurement of absolute cross sections, γ-ray angular distributions and excitation functions is reported. A cross section of 48 pb is found at E = 0.94 MeV. The data provide information on the E1 and E2 capture amplitudes involved in the transition to the ground state as well as to excited states. The S-factor at stellar energies has been determined by means of theoretical fits. The results verify the previous report of a substantial higher S-value compared to the value recommended in 1975. The present uncertainty in the S-value as well as possible improvements are discussed. This S-value is of crucial importance to nuclear astrophysics.

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