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

• DOI: 10.1016/j.physletb.2017.02.025
• Publication Date: 2017-02-17T00:32:51Z
• Authors: C. Massimi; S. Altstadt; J. Andrzejewski; L. Audouin; M. Barbagallo; V. Bécares; F. Bečvář; F. Belloni; E. Berthoumieux; J. Billowes; S. Bisterzo; D. Bosnar; M. Brugger; M. Calviani; F. Calviño; D. Cano-Ott; C. Carrapiço; D.M. Castelluccio; F. Cerutti; E. Chiaveri; L. Cosentino; M. Chin; G. Clai; N. Colonna; G. Cortés; M.A. Cortés-Giraldo; S. Cristallo; M. Diakaki; C. Domingo-Pardo; I. Duran; R. Dressler; C. Eleftheriadis; A. Ferrari; P. Finocchiaro; K. Fraval; S. Ganesan; A.R. García; G. Giubrone; I.F. Gonçalves; E. González-Romero; E. Griesmayer; C. Guerrero; F. Gunsing; A. Hernández-Prieto; D.G. Jenkins; E. Jericha; Y. Kadi; F. Käppeler; D. Karadimos; N. Kivel; P. Koehler; M. Kokkoris; S. Kopecky; M. Krtička; J. Kroll; C. Lampoudis; C. Langer; E. Leal-Cidoncha; C. Lederer; H. Leeb; L.S. Leong; S. Lo Meo; R. Losito; A. Mallick; A. Manousos; J. Marganiec; T. Martínez; P.F. Mastinu; M. Mastromarco; E. Mendoza; A. Mengoni; P.M. Milazzo; F. Mingrone; M. Mirea; W. Mondelaers; A. Musumarra; C. Paradela; A. Pavlik; J. Perkowski; M. Pignatari; L. Piersanti; A. Plompen; J. Praena; J.M. Quesada; T. Rauscher; R. Reifarth; A. Riego; M.S. Robles; C. Rubbia; M. Sabaté-Gilarte; R. Sarmento; A. Saxena; P. Schillebeeckx; S. Schmidt; D. Schumann; G. Tagliente; J.L. Tain; D. Tarrío; L. Tassan-Got; A. Tsinganis; S. Valenta; G. Vannini; I. Van Rijs; V. Variale; P. Vaz; A. Ventura; M.J. Vermeulen; V. Vlachoudis; R. Vlastou; A. Wallner; T. Ware; M. Weigand; C. Weiß; R. Wynants; T. Wright; P. Žugec
• Keywords: Gamma Spectroscopy; Parity (physics); R-matrix; Parametrization (atmospheric modeling)

This work reports on accurate, high-resolution measurements of the $^{25}$Mg($n, \gamma$)$^{26}$Mg and tot$) cross sections in neutron energy range from thermal to about 300 keV, leading a significantly improved parametrization. The relevant resonances for $n+^{25}$Mg were characterized combined R-matrix analysis experimental data. resulted an unambiguous spin/parity assignment corresponding excited states $^{26}$Mg. With this information upper limits reaction rates $^{22}$Ne($\alpha, n$)$^{25}$Mg established, potentially higher ($\alpha, n$)/($\alpha, \gamma$) ratio than previously evaluated. impact these results have been studied stellar models mass 2 25 $M_{\odot}$.