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Total cross-section measurements for ^(14)(α, γ)18F

Couch, R. G. and Spinka, H. and Tombrello, T. A. and Weaver, T. A. (1971) Total cross-section measurements for ^(14)(α, γ)18F. Nuclear Physics A, 175 (2). pp. 300-308. ISSN 0375-9474. doi:10.1016/0375-9474(71)90284-3.

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Total cross section measurements have been made for the ^(14)N(α,γ)^(18)F reaction for 0.5 ≦ E_α ≦ 1.2 MeV. A new resonance has been found at E_α(lab) = 0.56 MeV, corresponding to the 4.849 MeV state in ^(18)F. The quantity (2J + 1)Γ_αΓ_γ/Γ was determined to be (2.79±0.5) × 10^(−4) eV and 0.108±0.015 eV for states at E_α = 0.56 and 1.14 MeV, respectively. From a theoretical calculation of the cross section for direct radiative capture and an extrapolation of the tails of the measured resonances to E_α = 0.0, a value S ≈ 0.7 MeV · b has been estimated for the non-resonant S-factor. The astrophysical significance of the ^(14)N(α,γ)^(18)F reaction is discussed and the reaction rate, N_A〈 σν 〉, is calculated for temperatures 0.01 ≦ T_9 ≦ 1.0. The rate is accurately determined by the experimental measurements for T_9 > 0.09.

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Additional Information:© 1971 North-Holland Publishing Co. Received 20 July 1971. Supported in part by the National Science Foundation [GP-28027 and GP-19887]. The authors wish to express their gratitude to Dr. Dale Hebbard for having built the detection system used in this experiment and to Drs. Charles A. Barnes. William A. Fowler and Ralph W. Kavanagh for many helpful suggestions. Special thanks to go Barbara Zimmerman for her programming assistance.
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Subject Keywords:Nuclear reactions
Issue or Number:2
Record Number:CaltechAUTHORS:20151106-140714843
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61960
Deposited By: Ruth Sustaita
Deposited On:09 Nov 2015 17:30
Last Modified:10 Nov 2021 22:56

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