### Abstract

An attempt was made to measure the excitation function of the cross section for the [Formula Presented] reaction by performing the inverse reaction [Formula Presented] with the equivalent photons in the electric field of nuclei in a Pb target providing the [Formula Presented] rays for the reaction. The energy spectrum of lithium nuclei in coincidence with neutrons had no discernible peak where any beam-velocity [Formula Presented] would be located. Statistically, a Gaussian-shaped [Formula Presented] peak could have been present with [Formula Presented] 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 [Formula Presented] must be dominantly s-wave capture, and applying detailed balance, we obtained, with E in eV, [Formula Presented] The corresponding limit on the astrophysical reaction rate is [Formula Presented] [Formula Presented] Theoretical predictions of the reaction rate have exceeded our upper limit by factors of 3–50.

Original language | English |
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Journal | Physical Review C - Nuclear Physics |

Volume | 67 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 1 2003 |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

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## Cite this

*Physical Review C - Nuclear Physics*,

*67*(1). https://doi.org/10.1103/PhysRevC.67.015806