Record link: 
http://hdl.handle.net/20.500.12708/146418
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Title: 
Neutron spectroscopy of ²⁶Mg states: Constraining the stellar neutron source ²²Ne(α,n)²⁵Mg
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Citation: 
Massimi, C., Alstadt, S. G., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Becvar, F., Belloni, F., Berthoumieux, E., Billowes, J., Bisterzo, S., Bosnar, D., Brugger, M., Calviani, M., Calvino, F., Cano-Otto, D., Carrapiço, C., Castelluccio, D. M., Cerutti, F., … Žugec, P. (2017). Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n)25Mg. Physics Letters B, 768, 1–6. https://doi.org/10.1016/j.physletb.2017.02.025
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Publisher DOI: 
10.1016/j.physletb.2017.02.025
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Massimi, C. 
Alstadt, Sebastian G. 
Andrzejewski, J. 
Audouin, L. 
Barbagallo, M. 
Bécares, V. 
Becvar, F. 
Belloni, F. 
Berthoumieux, E. 
Billowes, J. 
Bisterzo, S. 
Bosnar, D. 
Brugger, M. 
Calviani, M. 
Calvino, Francisco 
Cano-Otto, D. 
Carrapiço, C. 
Castelluccio, Donato Maurizio 
Cerutti, F. 
Griesmayer, Erich 
Jericha, Erwin 
Leeb, Helmut 
Weiss, Christina 
Žugec, P. 
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Organisational Unit: 
E141-04 - Forschungsbereich Neutron- and Quantum Physics 
E141 - Atominstitut 
E141-03 - Forschungsbereich Nuclear and Particle Physics 
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Journal: 
Physics Letters B 
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ISSN: 
0370-2693
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Date (published): 
2017
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Number of Pages: 
6
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Publisher: 
ELSEVIER
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Peer reviewed: 
Yes
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Keywords: 
Nuclear and High Energy Physics; s Process; #alpha+#^{22}Ne; Neutron spectroscopy
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Abstract: 
This work reports on accurate, high-resolution measurements of the 25Mg(n,γ)26Mg and 25Mg(n,tot) cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved 25Mg(n,γ)26Mg parametrization. The relevant resonances for n+25Mg were characterized from a combined R-matrix analysis of the experimental data. This resulted in an unambiguous spin/parity assignment of the corresponding excited states in 26Mg. With this information experimental upper limits of the reaction rates for 22Ne(α,n)25Mg and 22Ne(α,γ)26Mg were established, potentially leading to a significantly higher (α,n)/(α,γ) ratio than previously evaluated. The impact of these results has been studied for stellar models in the mass range 2 to 25 M⊙
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Research Areas: 
Materials Characterization: 100%
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Science Branch: 
Physik, Astronomie
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