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    Production of 26Al in stellar hydrogen-burning environments: Spectroscopic properties of states in 27Si

    A. Parikh1,2,3,4,*, K. Wimmer3,4,5,†, T. Faestermann3,4, R. Hertenberger4,6, H.-F. Wirth4,6, A. A. Chen7,8, J. A. Clark9, C. M. Deibel9,10,‡, C. Herlitzius3,4 et al.

    R. Krücken3,4,§, D. Seiler3,4, K. Setoodehnia7, K. Straub3,4,∥, and C. Wrede11,†

    • 1Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, ES-08036 Barcelona, Spain
    • 2Institut d’Estudis Espacials de Catalunya, ES-08034 Barcelona, Spain
    • 3Physik Department E12, Technische Universität München, DE-85748 Garching, Germany
    • 4Maier-Leibnitz-Laboratorium der Münchner Universitäten (MLL), DE-85748 Garching, Germany
    • 5National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
    • 6Fakultät für Physik, Ludwig-Maximilians-Universität München, DE-85748 Garching, Germany
    • 7Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
    • 8Excellence Cluster Universe, Technische Universität München, DE-85748 Garching, Germany
    • 9Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
    • 10Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
    • 11Department of Physics, University of Washington, Seattle, Washington 98195, USA

    • * anuj.r.parikh@upc.edu
    • † Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
    • ‡ Present address: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
    • §Present address: TRIUMF, Vancouver, BC, Canada V6T 2A3
    • ∥Present address: Istituto Nazionale di Fisica Nucleare, IT-56127 Pisa, Italy
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    Phys. Rev. C 84, 065808 – Published 27 December, 2011

    DOI: https://doi.org/10.1103/PhysRevC.84.065808

    Abstract

    Model predictions of the amount of the radioisotope 26Al produced in hydrogen-burning environments require reliable estimates of the thermonuclear rates for the 26gAl(p,γ) 27Si and 26mAl(p,γ)27Si reactions. These rates depend upon the spectroscopic properties of states in 27Si within about 1 MeV of the 26gAl + p threshold (Sp = 7463 keV). We have studied the 28Si(3He,α)27Si reaction at 25 MeV using a high-resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. For the first time with a transfer reaction, we have constrained Jπ values for states in 27Si over Ex = 7.0–8.1 MeV through angular distribution measurements. Aside from a few important cases, we generally confirm the energies and spin-parity assignments reported in a recent γ-ray spectroscopy study. The magnitudes of neutron spectroscopic factors determined from shell-model calculations are in reasonable agreement with our experimental values extracted using this reaction.

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    Phys. Rev. C 84, 065808– Published 27 December, 2011
    • Received 22 August 2011

    ©2011 American Physical Society

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