Astrophysical reaction rate for the Li-8(n,gamma)Li-9 reaction

Kobayashi, H. and Ieki, K. and Horvath, A. and Galonsky, A. and Carlin, N. and Deak, F. and Gomi, T. and Guimaraes, V. and Higurashi, Y. and Iwata, Y. and Kiss, A. and Kolata, J. J. and Rauscher, T. and Schelin, H. and Seres, Z. and Warner, R.. (2003) Astrophysical reaction rate for the Li-8(n,gamma)Li-9 reaction. Physical review. C, Nuclear physics, Vol. 67, H. 1 , 015806.

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Official URL: http://edoc.unibas.ch/dok/A5839287

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An attempt was made to measure the excitation function of the cross section for the Li-8(n,gamma)Li-9 reaction by performing the inverse reaction Li-9(gamma,n)Li-8, with the equivalent photons in the electric field of nuclei in a Pb target providing the gamma rays for the reaction. The energy spectrum of lithium nuclei in coincidence with neutrons had no discernible peak where any beam-velocity Li-8`s would be located. Statistically, a Gaussian-shaped Li-8 peak could have been present with 30+/-29 counts, which we interpreted as consistent with zero, with a two-standard-deviation upper limit of 87 counts. Using the fact that neutron capture on Li-8 must be dominantly s-wave capture, and applying detailed balance, we obtained, with E in eV, sigma(n,gamma)>930E(-1/2) mu b. The corresponding limit on the astrophysical reaction rate is >790 cm(3) mol(-1) s(-1). Theoretical predictions of the reaction rate have exceeded our upper limit by factors of 3-50.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:45

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