Measurement of the8Li(n,γ)9Li cross section at astrophysical energies by reverse kinematics
| Autor: | Ferenc Deák, S. J. Gaff, Aaron Galonsky, J. von Schwarzenberg, R. E. Warner, Ákos Horváth, J. Wang, J. J. Kolata, Yoshiyuki Iwata, Erik Tryggestad, Jon J. Kruse, Z. Seres, G. J. Kunde, P. D. Zecher, Hugo R. Schelin, A. Kiss, Kazuo Ieki, D. J. Morrissey |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Physical Review C. 57:959-966 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.57.959 |
| Popis: | We have made the first attempt at determining the ${}^{8}$Li$(n,\ensuremath{\gamma})$${}^{9}$Li cross section at astrophysical energies. This reaction competes with the ${}^{8}$Li$(\ensuremath{\alpha}{,n)}^{11}$B reaction in the inhomogeneous big bang model and with ${}^{8}$Li $\ensuremath{\beta}$ decay in the $r$ process. It may affect the primordial abundance and the stellar production of Ag12 nuclei. Using a radioactive beam of ${}^{9}$Li and the Coulomb dissociation method we attempted to measure the cross section of the inverse reaction ${}^{9}$Li$(\ensuremath{\gamma}{,n)}^{8}$Li. We report only an upper limit because we were unable to determine and subtract the nuclear dissociation. Through the detailed balance theorem, this lead to an upper limit for the cross section of interest, ${}^{8}$Li$(n,\ensuremath{\gamma})$${}^{9}$Li. The limit is 19$\ifmmode\pm\else\textpm\fi{}$8 b for ${E}_{n}$ = 0--500 keV or, when expressed as a reaction rate, 7200 cm${}^{3}$ s${}^{\ensuremath{-}1}$ mole${}^{\ensuremath{-}1}$. |
| Databáze: | OpenAIRE |
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