• Rapid Communication

α-cluster asymptotic normalization coefficients for nuclear astrophysics

M. L. Avila, G. V. Rogachev, E. Koshchiy, L. T. Baby, J. Belarge, K. W. Kemper, A. N. Kuchera, and D. Santiago-Gonzalez
Phys. Rev. C 90, 042801(R) – Published 15 October 2014

Abstract

Background: Many important α-particle induced reactions for nuclear astrophysics may only be measured using indirect techniques due to the small cross sections at the energy of interest. One such indirect technique is to determine the asymptotic normalization coefficients (ANCs) for near-threshold resonances extracted from sub-Coulomb α-transfer reactions. This approach provides a very valuable tool for studies of astrophysically important reaction rates since the results are practically model independent. However, the validity of the method has not been directly verified.

Purpose: The aim of this Rapid Communication is to verify the technique using the O16(Li6,d)Ne20 reaction as a benchmark. The Ne20 nucleus has a well-known 1 state at an excitation energy of 5.79 MeV with a width of 28 eV. Reproducing the known value with this technique is an ideal opportunity to verify the method.

Method: The 1 state at 5.79 MeV is studied using the α-transfer reaction O16(Li6,d)Ne20 at sub-Coulomb energies.

Results: The partial α width for the 1 state at excitation energy of 5.79 MeV is extracted and compared with the known value, allowing the accuracy of the method to be evaluated.

Conclusions: This study demonstrates that extracting the ANCs using sub-Coulomb α-transfer reactions is a powerful tool that can be used to determine the partial α width of near-threshold states that may dominate astrophysically important nuclear reaction rates.

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  • Received 24 June 2014

DOI:https://doi.org/10.1103/PhysRevC.90.042801

©2014 American Physical Society

Authors & Affiliations

M. L. Avila1,*, G. V. Rogachev2,†, E. Koshchiy2, L. T. Baby1, J. Belarge1, K. W. Kemper1, A. N. Kuchera1,‡, and D. Santiago-Gonzalez1,§

  • 1Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 2Department of Physics & Astronomy and Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA

  • *mavila@anl.gov; Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • rogachev@tamu.edu
  • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • §Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

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Issue

Vol. 90, Iss. 4 — October 2014

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