Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n) 25Mg
Journal
Date Issued
2017
Author(s)
Massimi, C.
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Altstadt, S.
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Andrzejewski, J.
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Audouin, L.
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Barbagallo, M.
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Bécares, V.
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Bečvář, F.
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Belloni, F.
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Berthoumieux, E.
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Billowes, J.
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Bisterzo, S.
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Bosnar, D.
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Brugger, M.
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Calviani, M.
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Calviño, F.
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Cano-Ott, D.
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Carrapiço, C.
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Castelluccio, D. M.
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Cerutti, F.
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Chiaveri, E.
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Cosentino, L.
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Chin, M.
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Clai, G.
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Colonna, N.
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Cortés, G.
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Cortés-Giraldo, M. A.
•
•
Diakaki, M.
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Domingo-Pardo, C.
•
Duran, I.
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Dressler, R.
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Eleftheriadis, C.
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Ferrari, A.
•
Finocchiaro, P.
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Fraval, K.
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Ganesan, S.
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García, A. R.
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Giubrone, G.
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Gonçalves, I. F.
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González-Romero, E.
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Griesmayer, E.
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Guerrero, C.
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Gunsing, F.
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Hernández-Prieto, A.
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Jenkins, D. G.
•
Jericha, E.
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Kadi, Y.
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Käppeler, F.
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Karadimos, D.
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Kivel, N.
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Koehler, P.
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Kokkoris, M.
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Kopecky, S.
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Krtička, M.
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Kroll, J.
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Lampoudis, C.
•
Langer, C.
•
Leal-Cidoncha, E.
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Lederer, C.
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Leeb, H.
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Leong, L. S.
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Lo Meo, S.
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Losito, R.
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Mallick, A.
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Manousos, A.
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Marganiec, J.
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Martínez, T.
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Mastinu, P. F.
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Mastromarco, M.
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Mendoza, E.
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Mengoni, A.
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Milazzo, P. M.
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Mingrone, F.
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Mirea, M.
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Mondelaers, W.
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Musumarra, A.
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Paradela, C.
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Pavlik, A.
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Perkowski, J.
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Pignatari, M.
•
•
Plompen, A.
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Praena, J.
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Quesada, J. M.
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Rauscher, T.
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Reifarth, R.
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Riego, A.
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Robles, M. S.
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Rubbia, C.
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Sabaté-Gilarte, M.
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Sarmento, R.
•
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Schillebeeckx, P.
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Schmidt, S.
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Schumann, D.
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Tagliente, G.
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Tain, J. L.
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Tarrío, D.
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Tassan-Got, L.
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Tsinganis, A.
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Valenta, S.
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Vannini, G.
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Van Rijs, I.
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Variale, V.
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Vaz, P.
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Ventura, A.
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Vermeulen, M. J.
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Vlachoudis, V.
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Vlastou, R.
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Wallner, A.
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Ware, T.
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Weigand, M.
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Weiß, C.
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Wynants, R.
•
Wright, T.
•
Žugec, P.
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☉.
Volume
768
Start page
1
Issn Identifier
0370-2693
Ads BibCode
2017PhLB..768....1M
Rights
open.access
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