Abstract
26Al was the first cosmic radioactivity ever detected in the galaxy as well as one of the first extinct radioactivity observed in refractory phases of meteorites. Its nucleosynthesis in massive stars is still uncertain mainly due to the lack of nuclear information concerning the 26Al(n,p)26Mg and 26 Al(n,α)23Na reactions. We report on a single and coincidence measurement of the 27Al(p,p')27Al(p)26Mg and 27Al(p,p')27Al(α)23Na reactions performed at the Orsay TANDEM facility aiming at the spectroscopy study of 27Al above the neutron threshold. Fourteen states are observed for the first time within 350 keV above the 26Al+n threshold.
Highlights
26Al is a radioisotope produced in a variety of stellar sites such as massive stars (Wolf-Rayet phase and core-collapse supernovae), asymptotic giant branch (AGB) stars and nova outbursts
It β+ decays (T1/2 = 7.2 × 105 yr) to the first excited state of 26Mg which de-excites to its ground state emitting a characteristic gamma-ray line at Eγ = 1.809 MeV
In this work we investigate 27Al spectroscopy up to 350 keV above the 26Al+n threshold by means of the 27Al(p,p’)27Al* reaction
Summary
2. Experimental method and set-up The 27Al spectroscopy above 26Al+n threshold (Sn = 13.057 MeV) has been investigated with a high-precision study of the proton inelastic scattering off 27Al. High-resolution particle spectroscopy was used to derive the energy of the levels of interest. Their decay modes were studied performing the coincidence measurement of the 27Al(p,p’)27Al(p)26Mg and 27Al(p,p’)27Al(α)23Na reactions. The 27Al(p,p’)27Al* reaction was studied at the Tandem-Alto facility in Orsay, using a 18MeV proton beam of about 300 nA.
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