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 Becares, V. and Becvar, F. and Belloni, F. and Berthoumieux, E. and Billowes, J. and Bisterzok, S. and Bosnar, Damir and Brugger, M. and Calviani, M. and Calvino, F. and Cano-Ott, D. and Carrapico, C. and Castelluccio, D. M. and Cerutti, F. and Chiaveri, E. and Cosentino, L. and Chin, M. and Clai, G. and Colonna, N. and Cortes, G. and Cortes-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 Garcia, A. R. and Giubrone, G. and Goncalves, I. F. and Gonzalez-Romero, E. and Griesmayer, E. and Guerrero, C. and Gunsing, F. and Hernandez-Prieton, A. and Jenkins, D. G. and Jericha, E. and Kadi, Y. and Kaeppeler, F. and Karadimos, D. and Kivel, N. and Koehler, P. and Kokkoris, M. and Kopecky, S. and Krticka, 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 Martinez, 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 Sabate-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 Tarrio, 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 Žugec, Petar (2017) Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n)25Mg. Physics Letters B, 768. pp. 1-6. ISSN 0370-2693

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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⊙.

Item Type: Article
Keywords: s Process, α+22Ne, neutron spectroscopy
Date: 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 Nov 2017 20:38
Last Modified: 29 Nov 2017 15:13
URI: http://digre.pmf.unizg.hr/id/eprint/5730

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