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

Massimi, C. and Altstadt, S. and Andrzejewski, J. and Audouin, L. and Barbagallo, M. and Bécares, V. and Bev cváv r, F. and Belloni, F. and Berthoumieux, E. and Billowes, J. and Bisterzo, S. and Bosnar, D. and Brugger, M. and Calviani, M. and Calviño, F. and Cano-Ott, D. and Carrapic co, C. and Castelluccio, D. M. and Cerutti, F. and Chiaveri, E. and Cosentino, L. and Chin, M. and Clai, G. and Colonna, N. and Cortés, G. and Cortés-Giraldo, M. A. and Cristallo, S. and Diakaki, M. and Domingo-Pardo, C. and Duran, I. and Dressler, R. and Eleftheriadis, C. and Ferrari, A. and Finocchiaro, P. and Fraval, K. and Ganesan, S. and Garc`ia, A. R. and Giubrone, G. and Gonc calves, I. F. and González-Romero, E. and Griesmayer, E. and Guerrero, C. and Gunsing, F. and Hernández-Prieto, A. and Jenkins, D. G. and Jericha, E. and Kadi, Y. and Käppeler, F. and Karadimos, D. and Kivel, N. and Koehler, P. and Kokkoris, M. and Kopecky, S. and Krtiv cka, M. and Kroll, J. and Lampoudis, C. and Langer, C. and Leal-Cidoncha, E. and Lederer, C. and Leeb, H. and Leong, L. S. and Lo Meo, S. and Losito, R. and Mallick, A. and Manousos, A. and Marganiec, J. and Mart`inez, T. and Mastinu, P. F. and Mastromarco, M. and Mendoza, E. and Mengoni, A. and Milazzo, P. M. and Mingrone, F. and Mirea, M. and Mondelaers, W. and Musumarra, A. and Paradela, C. and Pavlik, A. and Perkowski, J. and Pignatari, M. and Piersanti, L. and Plompen, A. and Praena, J. and Quesada, J. M. and Rauscher, T. and Reifarth, R. and Riego, A. and Robles, M. S. and Rubbia, C. and Sabaté-Gilarte, M. and Sarmento, R. and Saxena, A. and Schillebeeckx, P. and Schmidt, S. and Schumann, D. and Tagliente, G. and Tain, J. L. and Tarr`io, D. and Tassan-Got, L. and Tsinganis, A. and Valenta, S. and Vannini, G. and Van Rijs, I. and Variale, V. and Vaz, P. and Ventura, A. and Vermeulen, M. J. and Vlachoudis, V. and Vlastou, R. and Wallner, A. and Ware, T. and Weigand, M. and Weiß, C. and Wynants, R. and Wright, T. and v Zugec, P.. (2017) Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n)25Mg. Physics Letters B, 768. pp. 1-6.

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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⊙.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas and Van Rijs, Isabelle
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0370-2693
e-ISSN:1873-2445
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:31 Jan 2018 09:52
Deposited On:31 Jan 2018 08:56

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