1. Neutron spectroscopy of 26Mg states: Constraining the stellar neutron source 22Ne(α, n)25Mg
- Author
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D. Tarrío, C. Paradela, A. Manousos, Rene Reifarth, J. Marganiec, P. Schillebeeckx, M. A. Cortés-Giraldo, P. F. Mastinu, S. Valenta, Marco Calviani, Marco Pignatari, F. Mingrone, J. Andrzejewski, Srinivasan Ganesan, Alfredo Ferrari, M. Mastromarco, Petar Žugec, Carlo Rubbia, A. Mallick, J. M. Quesada, L. Tassan-Got, J. L. Tain, C. Lampoudis, F. Cerutti, G. Vannini, A. Tsinganis, Mario Barbagallo, C. Carrapiço, Sergio Cristallo, Anton Wallner, D. Schumann, R. Vlastou, P. Vaz, J. Billowes, Nicola Colonna, L.S. Leong, M. Krtička, F. Calviño, A. R. García, S. Altstadt, E. Jericha, Damir Bosnar, Y. Kadi, Vasilis Vlachoudis, Christoph Langer, T. Martinez, N. Kivel, Paolo Finocchiaro, D. M. Castelluccio, P. E. Koehler, A. J. M. Plompen, Alberto Ventura, M. S. Robles, R. Losito, C. Weiß, T. Wright, M. Brugger, Javier Praena, S. Lo Meo, V. Bécares, I. Van Rijs, M. Weigand, M. J. Vermeulen, F. Belloni, G. Tagliente, Alberto Mengoni, A. Musumarra, Stefan Kopecky, P. M. Milazzo, D. G. Jenkins, M. Kokkoris, K. Fraval, A. Hernández-Prieto, M. Diakaki, Luigi Cosentino, G. Giubrone, E. Leal-Cidoncha, F. Bečvář, C. Eleftheriadis, Giulia Clai, F. Käppeler, E. Chiaveri, I. Duran, D. Cano-Ott, I. F. Gonçalves, Thomas Rauscher, A. K. Saxena, R. Dressler, R. Wynants, A. Pavlik, T. Ware, A. Riego, C. Domingo-Pardo, E. Griesmayer, M. Sabaté-Gilarte, D. Karadimos, L. Audouin, Carlos Guerrero, C. Lederer, E. González-Romero, M. P. W. Chin, Jeri Kroll, R. Sarmento, S. Schmidt, M. Mirea, L. Piersanti, E. Berthoumieux, W. Mondelaers, V. Variale, E. Mendoza, S. Bisterzo, H. Leeb, J. Perkowski, F. Gunsing, Cristian Massimi, G. Cortes, ITA, GBR, FRA, DEU, ESP, AUS, AUT, BEL, JPN, GRC, IND, CZE, CHE, Massimi, C., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bisterzo, S., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Castelluccio, D.M., Cerutti, F., Chiaveri, E., Cosentino, L., Chin, M., Clai, G., Colonna, N., Cortés, G., Cortés-Giraldo, M.A., Cristallo, S., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Finocchiaro, P., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Kopecky, S., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Lo Meo, S., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Mastinu, P.F., Mastromarco, M., Mendoza, E., Mengoni, A., Milazzo, P.M., Mingrone, F., Mirea, M., Mondelaers, W., Musumarra, A., Paradela, C., Pavlik, A., Perkowski, J., Pignatari, M., Piersanti, L., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Robles, M.S., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Van Rijs, I., Variale, V., Vaz, P., Ventura, A., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wynants, R., Wright, T., Žugec, P., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, n_TOF, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Capture ,nucl-ex ,Proce ,01 natural sciences ,Espectroscòpia atòmica ,Stellar nucleosynthesis ,CERN ,Neutron spectroscopy ,[ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,010303 astronomy & astrophysics ,Physics ,Cross section ,s Process ,α+22Ne ,lcsh:QC1-999 ,Neutron temperature ,PRIRODNE ZNANOSTI. Fizika ,Atomic spectroscopy ,Excited state ,Atomic physics ,s Process, α+22Ne, Neutron spectroscopy ,Nuclear and High Energy Physics ,nTOF ,Neutron ,[formula omitted]Ne ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Neutron spectroscopy, s Process, α+22Ne, Nuclear and High Energy Physics ,Nuclear physics ,Experimental ,TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY ,0103 physical sciences ,Nuclear Physics - Experiment ,Spin (physics) ,α+22 Ne ,Energies::Energia nuclear [Àrees temàtiques de la UPC] ,Neutrons ,Física [Àrees temàtiques de la UPC] ,010308 nuclear & particles physics ,NATURAL SCIENCES. Physics ,Neutron source ,Neutron spectroscopy, s Process, α+22Ne ,α+Ne ,s-process ,lcsh:Physics - 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 $M_{\odot}$., Comment: Preprint, 6 pages, 5 figures
- Published
- 2017