Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-16
Phys.Rev.Lett. 92 (2004) 031101
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure
Scientific paper
10.1103/PhysRevLett.92.031101
Understanding the processes which create and destroy $^{22}$Na is important for diagnosing classical nova outbursts. Conventional $^{22}$Na(p,$\gamma$) studies are complicated by the need to employ radioactive targets. In contrast, we have formed the particle-unbound states of interest through the heavy-ion fusion reaction, $^{12}$C($^{12}$C,n)$^{23}$Mg and used the Gammasphere array to investigate their radiative decay branches. Detailed spectroscopy was possible and the $^{22}$Na(p,$\gamma$) reaction rate has been re-evaluated. New hydrodynamical calculations incorporating the upper and lower limits on the new rate suggest a reduction in the yield of $^{22}$Na with respect to previous estimates, implying a reduction in the maximum detectability distance for $^{22}$Na $\gamma$ rays from novae.
Ernst Rehm K.
Freer Martin
Fulton Brian R.
Janssens R. V. F.
Jenkins David G.
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