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A new study of 25Mg $(\alpha, n)$ 28Si angular distributions at $E_{\alpha} =3-5$ MeV
- Source :
- The European Physical Journal A. 50
- Publication Year :
- 2014
- Publisher :
- Springer Science and Business Media LLC, 2014.
-
Abstract
- The observation of $^{26}$Al gives us the proof of active nucleosynthesis in the Milky Way. However the identification of the main producers of $^{26}$Al is still a matter of debate. Many sites have been proposed, but our poor knowledge of the nuclear processes involved introduces high uncertainties. In particular, the limited accuracy on the $^{25}$Mg($\alpha$,n)$^{28}$Si reaction cross section has been identified as the main source of nuclear uncertainty in the production of $^{26}$Al in C/Ne explosive burning in massive stars, which has been suggested to be the main source of $^{26}$Al in the Galaxy. We studied this reaction through neutron spectroscopy at the CN Van de Graaff accelerator of the Legnaro National Laboratories. Thanks to this technique we are able to discriminate the ($\alpha$,n) events from possible contamination arising from parasitic reactions. In particular, we measured the neutron angular distributions at 5 different beam energies (between 3 and 5 MeV) in the \ang{17.5}-\ang{106} laboratory system angular range. The presented results disagree with the assumptions introduced in the analysis of a previous experiment.<br />Comment: 9 pages, 9 figures - accepted by EPJA
- Subjects :
- Physics
Nuclear and High Energy Physics
Milky Way
Hadron
Astrophysics::Cosmology and Extragalactic Astrophysics
Galaxy
Neutron spectroscopy
law.invention
Nuclear physics
Astrophysics - Solar and Stellar Astrophysics
law
Nucleosynthesis
Van de Graaff generator
Nuclear fusion
Neutron
Nuclear Experiment
Subjects
Details
- ISSN :
- 1434601X and 14346001
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- The European Physical Journal A
- Accession number :
- edsair.doi.dedup.....e442116cf3ecca18117efe58e5b44570