arXiv : Neutron spectroscopy of $^{26}$Mg states: constraining the stellar neutron source $^{22}$Ne($\alpha, n$)$^{25}$Mg

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

doi:10.1016/j.physletb.2017.02.025

Article
Report number	arXiv:1702.04520
Title	Neutron spectroscopy of $^{26}$Mg states: constraining the stellar neutron source $^{22}$Ne($\alpha, n$)$^{25}$Mg
Related title	Neutron spectroscopy of $^{26}$Mg states: constraining the stellar neutron source $^{22}$Ne($\alpha, n$)$^{25}$Mg
Author(s)	Massimi, C. (INFN, Bologna ; Bologna U.) ; Altstadt, S. (Frankfurt U.) ; Andrzejewski, J. (Lodz U.) ; Audouin, L. (Orsay, IPN) ; Barbagallo, M. (INFN, Bari) ; Bécares, V. (Madrid, CIEMAT) ; Bečvář, F. (Charles U.) ; Belloni, F. (IRFU, Saclay) ; Berthoumieux, E. (IRFU, Saclay) ; Billowes, J. (Manchester U.) ; Bisterzo, S. (Turin Observ. ; Michigan State U., JINA) ; Bosnar, D. (Zagreb U.) ; Brugger, M. (CERN) ; Calviani, M. (CERN) ; Calviño, F. (Barcelona, Polytechnic U.) ; Cano-Ott, D. (Madrid, CIEMAT) ; Carrapiço, C. (Lisbon, Tech. U.) ; Castelluccio, D.M. (INFN, Bologna) ; Cerutti, F. (CERN) ; Chiaveri, E. (IRFU, Saclay) ; Cosentino, L. (INFN, LNS) ; Chin, M. (CERN) ; Clai, G. (INFN, Bologna ; ENEA, Bologna) ; Colonna, N. (INFN, Bari) ; Cortés, G. (Barcelona, Polytechnic U.) ; Cortés-Giraldo, M.A. (Seville U.) ; Cristallo, S. (Arcetri Observ.) ; Diakaki, M. (Natl. Tech. U., Athens) ; Domingo-Pardo, C. ; Duran, I. (Santiago de Compostela U.) ; Dressler, R. (PSI, Villigen) ; Eleftheriadis, C. (Aristotle U., Thessaloniki) ; Ferrari, A. (CERN) ; Finocchiaro, P. (INFN, LNS) ; Fraval, K. (IRFU, Saclay) ; Ganesan, S. ; García, A.R. (Madrid, CIEMAT) ; Giubrone, G. ; Gonçalves, I.F. (Lisbon, Tech. U.) ; González-Romero, E. (Madrid, CIEMAT) ; Griesmayer, E. (Vienna, Tech. U.) ; Guerrero, C. (CERN) ; Gunsing, F. (IRFU, Saclay) ; Hernández-Prieto, A. (CERN) ; Jenkins, D.G. (U. York (main)) ; Jericha, E. (Vienna, Tech. U.) ; Kadi, Y. (CERN) ; Käppeler, F. ; Karadimos, D. (Natl. Tech. U., Athens) ; Kivel, N. (PSI, Villigen) ; Koehler, P. (Oslo U.) ; Kokkoris, M. (Natl. Tech. U., Athens) ; Kopecky, S. (Geel, JRC) ; Krtička, M. (Charles U.) ; Kroll, J. (Charles U.) ; Lampoudis, C. (IRFU, Saclay) ; Langer, C. (Frankfurt U.) ; Leal-Cidoncha, E. (Santiago de Compostela U.) ; Lederer, C. (U. Vienna (main)) ; Leeb, H. (Vienna, Tech. U.) ; Leong, L.S. (Orsay, IPN) ; Lo Meo, S. (INFN, Bologna ; ENEA, Bologna) ; Losito, R. (CERN) ; Mallick, A. (Bhabha Atomic Res. Ctr.) ; Manousos, A. (Thessaloniki U.) ; Marganiec, J. (Lodz U.) ; Martínez, T. (Madrid, CIEMAT) ; Mastinu, P.F. ; Mastromarco, M. (INFN, Bari) ; Mendoza, E. (Madrid, CIEMAT) ; Mengoni, A. (ENEA, Bologna) ; Milazzo, P.M. (INFN, Trieste) ; Mingrone, F. (INFN, Bologna) ; Mirea, M. ; Mondelaers, W. (Geel, JRC) ; Musumarra, A. (INFN, LNS) ; Paradela, C. ; Pavlik, A. ; Perkowski, J. ; Pignatari, M. ; Piersanti, L. ; Plompen, A. (Geel, JRC) ; Praena, J. (Seville U.) ; Quesada, J.M. (Seville U.) ; Rauscher, T. ; Reifarth, R. ; Riego, A. ; Robles, M.S. ; Rubbia, C. (CERN) ; Sabaté-Gilarte, M. ; Sarmento, R. ; Saxena, A. ; Schillebeeckx, P. ; Schmidt, S. ; Schumann, D. ; Tagliente, G. (INFN, Bari) ; Tain, J.L. ; Tarrío, D. ; Tassan-Got, L. (Orsay, IPN) ; Tsinganis, A. (CERN) ; Valenta, S. (Charles U.) ; Vannini, G. (INFN, Bologna) ; Van Rijs, I. ; Variale, V. (INFN, Bari) ; Vaz, P. ; Ventura, A. (INFN, Bologna) ; Vermeulen, M.J. (U. York (main)) ; Vlachoudis, V. (CERN) ; Vlastou, R. ; Wallner, A. (Canberra U.) ; Ware, T. (Manchester U.) ; Weigand, M. (Frankfurt U.) ; Weiß, C. (Vienna, Tech. U., Atominst.) ; Wynants, R. ; Wright, T. (Manchester U.) ; Žugec, P. (Zagreb U.)
Collaboration	n_TOF
Publication	2017-05-10
Imprint	2017-02-15
Number of pages	6
Note	Preprint, 6 pages, 5 figures
In:	Phys. Lett. B 768 (2017) 1–6
DOI	10.1016/j.physletb.2017.02.025
Subject category	nucl-ex ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN PS ; nTOF
Abstract	This work reports on accurate, high-resolution measurements of the $^{25}$Mg($n, \gamma$)$^{26}$Mg and $^{25}$Mg($n, tot$) cross sections in the neutron energy range from thermal to about 300 keV, leading to a significantly improved $^{25}$Mg($n, \gamma$)$^{26}$Mg parametrization. The relevant resonances for $n+^{25}$Mg 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 $^{26}$Mg. With this information experimental upper limits of the reaction rates for $^{22}$Ne($\alpha, n$)$^{25}$Mg and $^{22}$Ne($\alpha, \gamma$)$^{26}$Mg were established, potentially leading to a significantly higher ($\alpha, n$)/($\alpha, \gamma$) ratio than previously evaluated. The impact of these results have been studied for stellar models in the mass range 2 to 25 $M_{\odot}$.
Copyright/License	publication: © 2017-2025 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³ License

$Color online. Level scheme (not to scale) of $^{26}$Mg with the entrance channels $^{22}$Ne+$\alpha$ and $n+^{25}$Mg and the exit channel $^{26}$Mg+$\gamma$. Excited states in $^{26}$Mg with natural parity ($0^+$, $1^-$, $2^+$, ...) and energies below $E_{\alpha}^{Lab}= 850$ keV (in red) can be studied via neutron resonance spectroscopy of $n+^{25}$Mg as indicated by the schematic $^{25}$Mg($n, \gamma$)$^{26}$Mg cross section.$ $Color online. Measured neutron capture yield and transmission of $^{25}$Mg. Experimental data are represented by red symbols and the simultaneous R-matrix of both data sets is given by dashed lines.$ $Color online. Resonance shape analysis of the neutron resonance at $E_n=194$ keV. The spin parity assignment $J^{\pi}=4^-$~\cite{Koeh} is excluded by the present data, which clearly indicate $J^{\pi}=3^-$. Only uncorrelated uncertainties, attributable to counting statistics, are reported.$ Show more plots

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