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26Al and 60Fe
From Supernovae Explosions

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Contact: F.X.Timmes
my one page vitae,
full vitae,
research statement, and
teaching statement.
Inner Milky Way Summary (2015):

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Models:
In this article, we explore the current abundances, fluxes, and spatial distributions of two key gamma-ray radioactivities, $^{26}$Al and $^{60}$Fe using recently calculated yields for Type II supernovae, along with models for chemical evolution and the distribution of mass in the interstellar medium. The estimated steady state production rates are 2.0 $\pm$ 1.0 M$_{\odot}$ / Myr for $^{26}$Al and 0.75 $\pm$ M$_{\odot}$ / Myr for $^{60}$Fe. This corresponds to 2.2 $\pm$ 1.1 M$_{\odot}$ of $^{26}$Al and 1.7 $\pm$ 0.9 M$_{\odot}$ of $^{60}$Fe in the present interstellar medium. Predictions for the $^{60}$Fe mass distribution, total mass, and flux map are given, in particular a $^{60}$Fe / $^{26}$Al flux ratio of 0.16 $\pm$ 0.12.

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26Al profile for a 25 Msun model
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60Fe profile for a 25 Msun model
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26Al & 60Fe profiles together



Observations:
The gamma-ray lines of 60Fe were measured by Smith (2004) using RHESSI and then by Wang et al (2007) using INTEGRAL. Both observations yield an $^{60}$Fe / $^{26}$Al flux ratio of 0.17 $\pm$ 0.05. Bouchet et al (2015) refine the INTEGRAL estimates to 0.14 $\pm$ 0.1.


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RHESSI 26Al measurement
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RHESSI 60Fe measurement
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Integral 60Fe measurement
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INTEGRAL 2015 map
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Integral Map Zoom



Experiment:

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60Fe decay scheme
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60Fe lifetime measurement
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26Al(n,α) measurement
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26Al(n,p) measurement
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60Fe(n,γ)61Fe cross section