Physics – Nuclear Physics
Scientific paper
Mar 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968nupha.110..619d&link_type=abstract
Nuclear Physics A, Volume 110, Issue 3, p. 619-636.
Physics
Nuclear Physics
16
Nuclear Reactions
Scientific paper
Described in this work are measurements of the thick target neutron yield from reaction 13C(α, n)16O. The yield was determined for laboratory bombarding energies between 0.475 MeV and 0.700 MeV using a stilbene scintillator neutron detector and pulse-shape discrimination to eliminate gamma rays. Stellar temperatures between 2.5 and 4.5 × 108 °K are involved in this energy region. The neutron yield was used to determine the astrophysical cross-section factor S(E), which was found to fit a linear function in the interaction energy E; S(E) = [(5.48+/-1.77)+(12.05+/-3.91)E]sx105 MeV . b, center-of-momentum system. The rate of the 13C(α, n)16O reaction is discussed with reference to neutron production in the helium-burning region of a star.
Results are also presented of measurements carried out on the reaction 9Be(α, n)12C taken with a thin Be target. The bombarding energy range covered was from 0.340 to 0.680 MeV with excitation curves for the ground and first excited state neutrons being reported. Resonances were found at bombarding energies of Elab = 0.520 MeV (Γ~55 keV c.m., ωγ = 3.79 eV c.m.) and Elab = 0.600 MeV (Γ < 4 keV c.m., ωγ = 0.88 eV c.m.).
Present address: Cyclotron Laboratory, Michigan State University, East Lansing, Michigan.
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