First direct measurement of the Mg23(p,γ)Al24 reaction
Physical Review C(2010)
摘要
The lowest-energy resonance in the $^{23}\\mathrm{Mg}$($p,\\ensuremath{\\gamma}$)$^{24}\\mathrm{Al}$ reaction, which is dominant at classical nova temperatures, has been measured directly for the first time using the DRAGON recoil spectrometer. The experiment used a radioactive $^{23}\\mathrm{Mg}$ beam (mixed within a significantly stronger $^{23}\\mathrm{Na}$ beam) of peak intensity $5\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{7}$ $\\mathrm{s}{}^{\\ensuremath{-}1}$, at the ISAC facility at TRIUMF. We extract values of ${E}_{R}={485.7}_{\\ensuremath{-}1.8}^{+1.3}$ keV and $\\ensuremath{\\omega}\\ensuremath{\\gamma}={38}_{\\ensuremath{-}15}^{+21}$ meV from our data (all values in the center-of-mass frame unless otherwise stated). In addition, the experiment prompted a recalculation of the $Q$ value for this reaction based on a revision of the $^{24}\\mathrm{Al}$ mass. The effect on the uncertainties in the quantities of ejected $^{22}\\mathrm{Na}$ and $^{26}\\mathrm{Al}$ from oxygen-neon classical novae is discussed.
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