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

Massimi, Cristian; Altstadt, S.; Andrzejewski, Józef, 1950-; Audouin, Laurent, 1974-; Barbagallo, Max; Bécares, V. (Vincente); Bečvář, František; Belloni, Fabio, 1974-; Berthoumieux, Eric; Billowes, Jonathan; Bisterzo, Sara; Bosnar, Damir, 1961-; Brugger, Markus, 1975-; Calviani, Marco; Calvino, Francisco; Cano-Ott, Daniel; Carrapiço, C.; Castelluccio, Donato Maurizio; Cerutti, Francesco; Chiaveri, Enrico; Cosentino, Luigi; Chin, Mary; Clai, Giulia; Colonna, Nicola; Cortés, G.; Cortes-Giraldo, Miguel Antonio; Cristallo, Sergio, 1976-; Diakaki, Maria; Domingo-Pardo, César; Durán, Ignacio, Prof.; Dressler, Rugard; Eleftheriadis, Christos; Ferrari, Anna; Finocchiaro, Paolo (Nuclear physicist); Fraval, Kevin; Srinivasan, G. (Ganesan), 1942- ; Garcia, A. R.; Giubrone, Giuseppe; Gonçalves, Isabella Maria Ferro Periera; González Romero, Enrique Miguel; Griesmayer, Erich; Guerrero, Carlos (Nuclear physicist); Gunsing, Frank; Hernandez-Prieto, Alvaro; Jenkins, David G.; Jericha, Erwin; Kadi, Yacine; Käppeler, F. (Franz); Karadimos, Dimitrios; Kivel, Niko; Koehler, Paul; Kokkoris, Michael; Kopecky, Stefan; Krtička, M. (Milan); Kroll, Jiří; Lampoudis, Christos; Langer, Christoph 1981-; Leal-Cidoncha, Esther; Lederer-Woods, Claudia; Leeb, Helmut; Leong, Lou Sai; Lo Meo, Sergio; Losito, Roberto; Mallick, Amod Kishore; Manousos, Athanasios; Marganiec, Justyna; Martinez, T.; Mastinu, Pierfrancesco; Mastromarco, Mario; Mendoza Cembranos, Emilio; Mengoni, Alberto; Milazzo, Paolo Maria; Mingrone, Frederica; Mirea, Mihail; Mondelaers, Wim; Musumarra, Agatino; Paradela, Carlos; Pavlik, Andreas; Perkowski, Jarosław; Pignatari, Marco; Piersanti, Luciano; Plompen, Arjan; Praena, Javier; Quesada, José Manuel; Rauscher, Thomas, 1964-; Reifarth, René; Riego, Albert; Robles, M. S.; Rubbia, Carlo; Sabate-Gilarte, Marta; Sarmento, Raul; Saxena, Alok Kumar; Shillebeeckx, Peter; Schmidt, Stefan (Astrophysicist); Schumann, Dorothea; Tagliente, Giuseppe; Tain, Jose Luis; Tarrío, Diego; Tassan-Got, Laurent; Tsinganis, Andrea; Valenta, Stanislav; Vannini, Gianni; Van Rijs, Isabelle; Variale, Vincenze; Vaz, Pedro; Ventura, A. (Alberto); Vermeulen, Mark J.; Vlachoudis, Vasilis; Vlastou, Rosa; Wallner, Anton S.; Ware, Tim; Weigand, Mario; Weiß, C.; Wynants, R.; Wright, Tobias J.; Žugec, Petar

School of Mathematics and Physical Sciences
s Process; α+²²Ne; Neutron spectroscopy
2017

Journal article


Rights
Shared under a creative commons licence - https://creativecommons.org/licenses/by/4.0/
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⊙.

Publisher
The University of Hull
Peer reviewed
Yes
Language
English
Extent
1 MB
Identifier
hull:14471

Journal

Journal title
Physics letters B
Publication date
2017
Publisher
Elsevier
DOI
10.1016/j.physletb.2017.02.025
ISSN (Print)
0370-2693
ISSN (Electronic)
1873-2445
Volume
768
Start page
1
End page
6
Notes

This is a copy of an article published in: Physics letters B, 2017, v.768.

Link
Published article
QR Code