Astrophysical reaction rate for the [Formula Presented] reaction

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

Research output: Contribution to journalArticle

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 languageEnglish
JournalPhysical Review C - Nuclear Physics
Volume67
Issue number1
DOIs
Publication statusPublished - Jan 1 2003

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Kobayashi, H., Ieki, K., Horváth, Á., Galonsky, A., Carlin, N., Deák, F., Gomi, T., Guimaraes, V., Higurashi, Y., Iwata, Y., Kiss, A., Kolata, J. J., Rauscher, T., Schelin, H., Seres, Z., & Warner, R. (2003). Astrophysical reaction rate for the [Formula Presented] reaction. Physical Review C - Nuclear Physics, 67(1). https://doi.org/10.1103/PhysRevC.67.015806