The (Li8, α) reaction at low energy: Direct H4 cluster transfer?
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The (Li8, α) reaction has been studied at E(Li8)=27.7 MeV on targets of natC, Al27, and Pb208 using a secondary Li8 beam. The α-energy spectra for Al27 and Pb208 are generally nondistinct and resemble fragmentation spectra. In contrast, data for the natC target exhibit enhanced (Li8, α) cross sections in the region corresponding to population of low-lying levels in N16. Angular distributions were determined over a large angular range and exhibit a strong forward peaking for Al27 and some forward peaking for the natC data. They are otherwise rather featureless but distinct from spectra expected from fusion evaporation. The data for Al27 are indicative of either direct or sequential fragmentation processes. Similar analysis of limited data obtained at E(Li8)=27.7 MeV for the Pb208 target, along with data previously obtained at higher Li8 energies, is suggestive of a sequential breakup mechanism. In the case of the natC target, the data corresponding to low excitation energies in N16 exhibit (Li8, α) angular distributions that appear to be most consistent with a H4 transfer mechanism. However, we cannot distinguish between a one-step H4 cluster transfer and a multistep H4 transfer (such as n+H3). © 2005 The American Physical Society.
author list (cited authors)
Becchetti, F. D., Raymond, R. S., Roberts, D. A., Lucido, J., DeYoung, P. A., Hilldore, B., ... Hinnefeld, J. D.