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arXiv 1008.4170nucl-exastro-ph.SR
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经典新星中22 Na(p,g)23 Mg共振的直接测量和22 Na产生的结果

Direct measurements of 22Na(p,g)23Mg resonances and consequences for 22Na production in classical novae

A. L. Sallaska, C. Wrede, A. Garcia, D. W. Storm, T. A. D. Brown, C. Ruiz, K. A. Snover, D. F. Ottewell, L. Buchmann, C. Vockenhuber, D. A. Hutcheon, J. A. Caggiano

摘要:

放射性核素22 Na是一种潜在的天文观测,预计在经典新星中产生的数量取决于22 Na(p,g)23 Mg反应的热核速率。我们用放射性~(22)Na靶直接、绝对地测量了低能~(22)Na(p,g)~(23)Mg共振的强度。我们发现在E_p = 213,288,454和610 keV的共振强度比以前的测量高出2.4至3.2倍,我们排除了在E_p = 198,209和232 keV的共振对速率的重要贡献。22钠丰度预计在喷出物的经典新星减少了一个因素的~ 2。

英文摘要:

The radionuclide 22Na is a potential astronomical observable that is expected to be produced in classical novae in quantities that depend on the thermonuclear rate of the 22Na(p,g)23Mg reaction. We have measured the strengths of low-energy 22Na(p,g)23Mg resonances directly and absolutely using a radioactive 22Na target. We find the strengths of resonances at E_p = 213, 288, 454, and 610 keV to be higher than previous measurements by factors of 2.4 to 3.2, and we exclude important contributions to the rate from proposed resonances at E_p = 198, 209, and 232 keV. The 22Na abundances expected in the ejecta of classical novae are reduced by a factor of ~ 2.

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