Systematic study of exotic clustering in even-even actinide nuclei

Abstract

We compare exotic cluster model predictions of the properties of 19 even-even actinide nuclei with experimental data. We restrict our attention to clusters which have been observed in exotic decay (i.e., ${}^{14}\mathrm{C},{}^{20}\mathrm{O},{}^{24}\mathrm{Ne},{}^{28}\mathrm{Mg},$ and ${}^{32}\mathrm{Si})\mathrm{}$ and concentrate on nuclei which may be modeled as Pb cores combined with these clusters, i.e., isotopes of Ra, Th, U, Pu, and Cm, respectively. Using fixed parameter values for all cases, we examine the energies of the states in the lowest ${J}^{\ensuremath{\pi}}{=0}^{+}{,2}^{+}{,4}^{+},\dots{}$ and ${J}^{\ensuremath{\pi}}{=1}^{\ensuremath{-}}{,3}^{\ensuremath{-}}{,5}^{\ensuremath{-}},\dots{}$ bands, the $B(E2 \ensuremath{\downarrow})$ transition strengths in the positive parity bands, and the values for $B(E3 \ensuremath{\uparrow}{;0}^{+}\ensuremath{\rightarrow}{3}^{\ensuremath{-}})$ and $B(E4 \ensuremath{\uparrow}{;0}^{+}\ensuremath{\rightarrow}{4}^{+}).$ The level of agreement between calculated and measured values is generally good.