학술논문
Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α,n)25Mg
Document Type
article
Author
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
Source
Physics Letters B, Vol 768, Iss C, Pp 1-6 (2017)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
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⊙.