Europhys. Lett.
Volume 63, Number 4, August 2003
Page(s) 524 - 530
Section Nuclear physics
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00570-7
Europhys. Lett., 63 (4) , pp. 524-530 (2003)

$\chem{{}^8Li+\alpha}$ decay of $\chem{{}^{12}B}$ and its possible astrophysical implications

N. Soic1, S. Cherubini2, M. Lattuada2, D. Miljanic1, S. Romano2, C. Spitaleri2 and M. Zadro1

1  Ruder Boskovic Institute - Zagreb, Croatia
2  INFN-Laboratori Nazionali del Sud and Università di Catania - Catania, Italy

(Received 10 March 2003; accepted in final form 17 June 2003)

The $\chem{{}^{12}B}$ excitation energy spectrum has been obtained from coincidence measurements of the $\chem{{}^9Be}+\chem{{}^7Li}
\rightarrow 2\alpha+\chem{{}^8Li}$ reaction at E0=52 $\un{MeV}$. The decay of the states at excitations between 10 and 16 $\un{Mev}$ into $\alpha+\chem{{}^8Li}$ has been observed for the first time. Observed $\alpha$-decay indicates possible cluster structure of the $\chem{{}^{12}B}$ excited states. The influence of these states on the cross-section of the astrophysically important $\chem{{}^8Li}$( $\alpha,\ab{n}$) $\chem{{}^{11}B}$ and $\chem{{}^9Be}+\ab{t}$ reactions is discussed and the results are compared with existing results.

21.10.-k - Properties of nuclei; nuclear energy levels.
26.35.+c - Big Bang nucleosynthesis.
27.20.+n - $6\leq A \leq 19$.

© EDP Sciences 2003