Nucleosynthesis of Al26 in massive stars: New Al27 states above α and neutron emission thresholds

S. Benamara, N. de Séréville, A. M. Laird, F. Hammache, I. Stefan, P. Roussel, S. Ancelin, M. Assié, A. Coc, I. Deloncle, S. P. Fox, J. Kiener, L. Lefebvre, A. Lefebvre-Schuhl, G. Mavilla, P. Morfouace, Á. M. Sánchez-Benítez, L. Perrot, M. Sinha, V. Tatischeff, and M. Vandebrouck
Phys. Rev. C 89, 065805 – Published 25 June 2014

Abstract

The 26Al radioisotope is of great importance for understanding the chemical and dynamical evolution of our galaxy. Among the possible stellar sources, massive stars are believed to be the main producer of this radioisotope. Understanding 26Al nucleosynthesis in massive stars requires estimates of the thermonuclear reaction rates of the Al26(n,p)26Mg, Al26(n,α)23Na, and Na23(α,p)26Mg reactions. These reaction rates depend on the spectroscopic properties of 27Al states above the neutron and alpha thresholds. In this context, the Al27(p,p)27Al* reaction was studied at 18 MeV using a high-resolution Enge Split-Pole spectrometer. States from the ground state up to excitation energies of 14 MeV were populated. While up to the 23Na + α threshold no additional states are observed, we report for the first time 30 new levels above the 23Na + α threshold and more than 30 new states above the 26Al + n threshold for which excitation energies are determined with an uncertainty of 4–5 keV.

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  • Received 15 January 2014
  • Revised 21 April 2014

DOI:https://doi.org/10.1103/PhysRevC.89.065805

©2014 American Physical Society

Authors & Affiliations

S. Benamara1,2, N. de Séréville2,*, A. M. Laird3, F. Hammache2, I. Stefan2, P. Roussel2, S. Ancelin2, M. Assié2, A. Coc4, I. Deloncle4, S. P. Fox3, J. Kiener4, L. Lefebvre2, A. Lefebvre-Schuhl4, G. Mavilla2, P. Morfouace2, Á. M. Sánchez-Benítez5,†, L. Perrot2, M. Sinha6, V. Tatischeff4, and M. Vandebrouck2

  • 1Laboratoire de Physique et Chimie Quantique, Université Mouloud Mammeri, Tizi-Ouzou, Algeria
  • 2Institut de Physique Nucléaire d'Orsay, UMR8608, IN2P3-CNRS, Université Paris Sud 11, 91406 Orsay, France
  • 3Department of Physics, University of York, York YO10 5DD, United Kingdom
  • 4CSNSM, IN2P3-CNRS et Université Paris Sud 11, 91405 Orsay Campus, France
  • 5Departamento de Física Aplicada, Universidad de Huelva, E-21071 Huelva, Spain
  • 6Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India

  • *deserevi@ipno.in2p3.fr
  • Present address: Centro de Física Nuclear da Universidade de Lisboa, 1649-003 Lisboa, Portugal.

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Issue

Vol. 89, Iss. 6 — June 2014

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