Neutron spectroscopy of ²⁶Mg states: Constraining the stellar neutron source ²²Ne(α,n)²⁵Mg

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.

doi:10.1016/j.physletb.2017.02.025

Record link:

http://hdl.handle.net/20.500.12708/146418

Title:

Neutron spectroscopy of ²⁶Mg states: Constraining the stellar neutron source ²²Ne(α,n)²⁵Mg

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

Publisher DOI:

10.1016/j.physletb.2017.02.025

Publication Type:

Article - Original Research Article

Language:

English

Organisational Unit:

E141-04 - Forschungsbereich Neutron- and Quantum Physics
E141 - Atominstitut
E141-03 - Forschungsbereich Nuclear and Particle Physics

Journal:

Physics Letters B

ISSN:

0370-2693

Date (published):

2017

Number of Pages:

Publisher:

ELSEVIER

Peer reviewed:

Yes

Keywords:

Nuclear and High Energy Physics; s Process; #alpha+#^{22}Ne; Neutron spectroscopy

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⊙

Research Areas:

Materials Characterization: 100%

Science Branch:

Physik, Astronomie

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