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Fusion Hindrance for a Positive-Q-Value System Mg-24+Si-30

C. L. Jiang A. M. Stefanini H. Esbensen K. E. Rehm S. Almaraz-Calderon B. B. Back L. Corradi E. Fioretto G. Montagnoli F. Scarlassara D. Montanari S. Courtin 1 D. Bourgin 1 F. Haas 1 A. Goasduff 2 S. Szilner T. Mijatovic
2 CSNSM SNO
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : Measurements of the excitation function for the fusion of Mg-24 + Si-30 (Q = 17.89 MeV)have been extended toward lower energies with respect to previous experimental data. The S-factor maximum observed in this large, positive-Q-value system is the most pronounced among such systems studied thus far. The significance and the systematics of an S-factor maximum in systems with positive fusion Q values are discussed. This result would strongly impact the extrapolated cross sections and reaction rates in the carbon and oxygen burnings and, thus, the study of the history of stellar evolution.
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Submitted on : Tuesday, August 26, 2014 - 2:04:46 PM
Last modification on : Wednesday, September 16, 2020 - 5:42:41 PM

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C. L. Jiang, A. M. Stefanini, H. Esbensen, K. E. Rehm, S. Almaraz-Calderon, et al.. Fusion Hindrance for a Positive-Q-Value System Mg-24+Si-30. Physical Review Letters, American Physical Society, 2014, 113, pp.022701. ⟨10.1103/PhysRevLett.113.022701⟩. ⟨in2p3-01058257⟩

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