α-decaying states in ${}^{10,12}\mathrm{Be}$ populated in the ${}^{10}\mathrm{Be}$(${}^{14}\mathrm{C}$,${}^{10,12}\mathrm{Be}$) reaction

A search has been made for the ${}^6\mathrm{He}+{}^6\mathrm{He}$ and α + ${}^8\mathrm{He}$ decay of the molecular rotational band in ${}^{12}\mathrm{Be}$ using the ${}^{10}\mathrm{Be}$(${}^{14}\mathrm{C}$,${}^{12}\mathrm{Be}$${}^{*}$)${}^{12}\mathrm{C}$ reaction at 88.5 MeV. Although the α + ${}^6\mathrm{He}$ decay of ${}^{10}\mathrm{Be}$ was observed in the data set there is no evidence for the breakup of ${}^{12}\mathrm{Be}$. The cross-section upper limits for the ${}^{10}\mathrm{Be}$(${}^{14}\mathrm{C}$,${}^6\mathrm{He}$ ${}^6\mathrm{He}$)${}^{12}\mathrm{C}$ and ${}^{10}\mathrm{Be}$(${}^{14}\mathrm{C}$,α ${}^8\mathrm{He}$)${}^{12}\mathrm{C}$ reactions are 50 and 300 nb respectively.

Figure 1

PI spectrum obtained using the DSSD and RSD detectors of a telescope. In the inset a PI using the RSD and CsI energies is shown.

Figure 2

$E_{\mathrm{tot}}$ spectrum for the ${}^{10}\mathrm{Be}$(${}^{14}\mathrm{C}$,α ${}^6\mathrm{He}$)${}^{14}\mathrm{C}$ reaction.

Figure 3

($E_{\mathrm{rec}}-Q_3$) vs $p_{\mathrm{rec}}^2$/2 for the ${}^{10}\mathrm{Be}$(${}^{14}\mathrm{C}$,α ${}^6\mathrm{He}$)${}^{14}\mathrm{C}$ reaction. The lines are described in the text. For clarity the data have only been plotted for bins with a content $>2$ counts.

Figure 4

$E_x$ spectrum for the α + ${}^6\mathrm{He}$ decay of ${}^{10}\mathrm{Be}$.