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

Hiroshi Kobayashi, Kazuo Ieki, Ákos Horváth, Aaron Galonsky, Nelson Carlin, Ferenc Deák, Tomoko Gomi, Valdir Guimaraes, Yoshihide Higurashi, Yoshiyuki Iwata, Ádám Kiss, James J. Kolata, Thomas Rauscher, Hugo Schelin, Zoltan Seres, Robert Warner

Research output: Contribution to journalArticlepeer-review


An attempt was made to measure the excitation function of the cross section for the 8Li(n, γ)9Li reaction by performing the inverse reaction 9Li(γ,n)8Li, with the equivalent photons in the electric field of nuclei in a Pb target providing the γ rays for the reaction. The energy spectrum of lithium nuclei in coincidence with neutrons had no discernible peak where any beam-velocity 8Li's would be located. Statistically, a Gaussian-shaped 8Li 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 8Li must be dominantly s-wave capture, and applying detailed balance, we obtained, with E in eV, σn, γ<930E-1/2 μb. The corresponding limit on the astrophysical reaction rate is <790 cm3 mol-1 s-1. Theoretical predictions of the reaction rate have exceeded our upper limit by factors of 3-50.

Original languageEnglish
Article number015806
Pages (from-to)158061-158067
Number of pages7
JournalPhysical Review C covering nuclear physics
Issue number1
Publication statusPublished - 1 Jan 2003


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