Neutron spectroscopy of ²⁶Mg states

Author(s)

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

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

_⊙.

Organisation(s)

Basic Experimental Physics Training and University Didactics, Isotope Physics

External organisation(s)

Istituto Nazionale di Fisica Nucleare (INFN), Roma, Università degli Studi di Catania, University of Bologna, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Lodz, IPHC, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, IRFU CEA-Saclay laboratory , University of Manchester, INAF-Osservatorio Astrofisico di Torino, Joint Institute of Nuclear Astrophysics - Center for the Evolution of the Elements, University of Notre Dame, University of Zagreb, European Organization for Nuclear Research (CERN), Universitat Politècnica de Catalunya, Universidade de Lisboa, Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile, Universidad de Sevilla, Osservatorio Astronomico di Collurania Vincenzo Cerulli, National Technical University of Athens (NTUA), Universitat de València, Universidade de Santiago de Compostela (USC), Paul Scherrer Institute, Aristotle University of Thessaloniki, Bhabha Atomic Research Center, Technische Universität Wien, York University, Karlsruher Institut für Technologie, University of Oslo (UiO), Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, Istituto Nazionale di Fisica Nucleare (INFN), Legnaro, Università degli Studi di Trieste, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, University of Hull, Universität Basel, University of Hertfordshire, Australian National University

Journal

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

768

Pages

1-6

No. of pages

6

ISSN

0370-2693

DOI

https://doi.org/10.1016/j.physletb.2017.02.025

Publication date

05-2017

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics

Keywords

ASJC Scopus subject areas

Nuclear and High Energy Physics

Portal url

https://ucris.univie.ac.at/portal/en/publications/neutron-spectroscopy-of-26mg-states(49a58558-ceb0-461d-ad4b-7b336c3be37a).html