Probing clustering in excited alpha-conjugate buclei
  The fragmentation of quasi-projectiles from the nuclear reaction $^{40}$Ca+$^{12}$C at 25 MeV per nucleon bombarding energy was used to produce $\alpha$-emission sources. From a careful selection of these sources provided by a complete detection and from comparisons with models of sequential and simultaneous decays, evidence in favor of $\alpha$-particle clustering from excited $^{16}O$, $^{20}Ne$ and $^{24}Mg$ is reported. 
B. Borderie, Ad. R. Raduta, G. Ademard, M. F. Rivet, E. De Filippo, E.   Geraci, N. Le Neindre, R. Alba, F. Amorini, G. Card...
nucl-ex