Measurement of the 8Li(n,γ)9Li cross section at astrophysical energies by reverse kinematics

P. D. Zecher, A. Galonsky, S. J. Gaff, J. J. Kruse, G. Kunde, E. Tryggestad, J. Wang, R. E. Warner, D. J. Morrissey, K. Ieki, Y. Iwata, F. Deák, Á. Horváth, Á. Kiss, Z. Seres, J. J. Kolata, J. von Schwarzenberg, and H. Schelin
Phys. Rev. C 57, 959 – Published 1 February 1998
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Abstract

We have made the first attempt at determining the 8Li(n,γ)9Li cross section at astrophysical energies. This reaction competes with the 8Li(α,n)11B reaction in the inhomogeneous big bang model and with 8Li β decay in the r process. It may affect the primordial abundance and the stellar production of A>12 nuclei. Using a radioactive beam of 9Li and the Coulomb dissociation method we attempted to measure the cross section of the inverse reaction 9Li(γ,n)8Li. We report only an upper limit because we were unable to determine and subtract the nuclear dissociation. Through the detailed balance theorem, this lead to an upper limit for the cross section of interest, 8Li(n,γ)9Li. The limit is 19±8 b for En = 0–500 keV or, when expressed as a reaction rate, 7200 cm3 s1 mole1.

  • Received 25 August 1997

DOI:https://doi.org/10.1103/PhysRevC.57.959

©1998 American Physical Society

Authors & Affiliations

P. D. Zecher*, A. Galonsky, S. J. Gaff, J. J. Kruse, G. Kunde, E. Tryggestad, J. Wang, and R. E. Warner

  • National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321

D. J. Morrissey

  • National Superconducting Cyclotron Laboratory and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824

K. Ieki and Y. Iwata

  • Rikkyo University, 3 Nishi-Ikebukuro, Toshima, Tokyo 171, Japan

F. Deák, Á. Horváth, and Á. Kiss

  • Department of Atomic Physics, Eötvös Loránd University, H-1088 Puskin uta 5-7, Budapest, Hungary

Z. Seres

  • KFKI Research Institute for Particle and Nuclear Physics, H-1525 Budapest 114, Hungary

J. J. Kolata and J. von Schwarzenberg

  • Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556

H. Schelin

  • CFET, Av. Sete de Setembro 3165 80230-901, Curitiba, Pr, Brazil

  • *Present address: Deloitte & Touche Consulting Group, Two World Financial Center, New York, NY 10281-1420.
  • Permanent address: Department of Physics, Oberlin College, Oberlin, OH 44074.

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Vol. 57, Iss. 2 — February 1998

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