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APS » Journals » Phys. Rev. C » Volume 57 » Issue 2
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Phys. Rev. C 57, 959–966 (1998)

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

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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

Received 25 August 1997; published in the issue dated February 1998

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 s-1 mole-1.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.57.959
DOI:
10.1103/PhysRevC.57.959
PACS:
26.35.+c, 25.40.Lw, 25.60.-t, 26.30.+k

*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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