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Search for nonresonant capture in the 16O(α,γ)20Ne reaction at low energies

Hahn, K. H. and Chang, K. H. and Donoghue, T. R. and Filippone, B. W. (1987) Search for nonresonant capture in the 16O(α,γ)20Ne reaction at low energies. Physical Review C, 36 (3). pp. 892-898. ISSN 0556-2813. http://resolver.caltech.edu/CaltechAUTHORS:HAHprc87

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Abstract

20Ne recoils produced from the 16O(α,γ) 20Ne reaction were detected in coincidence with capture γ rays using a recoil separator, NaI(Tl) γ-ray detectors, and a helium gas target. Total cross sections for cascade and ground state capture were measured in the range Ec.m.=1.7–2.35 MeV. Improved measurements of the total width and resonance strength of the Ec.m.=1.99 MeV (Jπ=0+) resonance and the resonance strength of the Ec.m.=1.054 MeV (Jπ=1-) resonance are reported. The astrophysical S factor for nonresonant capture into the 20Ne ground state was measured to be 0.26±0.07 MeV b, assuming an energy-independent S factor between Ec.m.=1.7 and 2.35 MeV. Using theoretical estimates for the energy dependence and branching ratios for the nonresonant capture, a best estimate for the total S factor at 300 keV of 0.7±0.3 MeV b is determined.


Item Type:Article
Additional Information:©1987 The American Physical Society Received 25 March 1987 The authors would like to thank C. A. Barnes, W. A. Fowler, R. M. Kremer, and K. Langanke for many helpful discussions, and S.-C. Wu for assistance during part of the data acquisition. This work was supported in part by a gift to the California Institute of Technology by the W. M. Keck Foundation and by National Science Foundation Grant PHY 85-05682.
Record Number:CaltechAUTHORS:HAHprc87
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HAHprc87
Alternative URL:http://dx.doi.org/10.1103/PhysRevC.36.892
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5441
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:17 Oct 2006
Last Modified:26 Dec 2012 09:05

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