English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The possibility of the $^8$He and $^{9}$Li clusters in atomic nuclei isdiscussed. Until now most of the clusters in the conventional models have beenlimited to the closures of the three-dimensional harmonic oscillators, such as$^4$He, $^{16}$O, and $^{40}$Ca. In the neutron-rich nuclei, however, theneutron to proton ratio is not unity, and it is worthwhile to think about moreneutron-rich objects with $N>Z$ as the building blocks of cluster structures.Here the nuclei with the neutron number six, which is the subclosure of the$p_{3/2}$ subshell of the $jj$-coupling shell model, are assumed to beclusters, and thus we study the $^8$He and $^9$Li cluster structures in$^{16}$Be ($^8$He+$^8$He), $^{17}$B ($^8$He+$^9$Li), $^{18}$C ($^9$Li+$^9$Li),and $^{24}$C ($^8$He+$^8$He+$^8$He). Recent progress of the antisymmetrizedquasi cluster model (AQCM) enables us to utilize $jj$-coupling shell model wavefunctions as the clusters rather easily. It is shown that the $^8$He+$^9$Li and$^9$Li+$^9$Li cluster configurations cover the lowest shell-model states of$^{17}$B and $^{18}$C, respectively. To predict the cluster states with largerelative distances, we increase the expectation value of the principal quantumnumbers by adding the nodes to the lowest states under the condition that thetotal angular momentum is unchanged (equal to $J^\pi =0$). As a result,developed cluster states are obtained around the corresponding thresholdenergies. The rotational band structure of $^{24}$C, which reflect the symmetryof equilateral triangular configuration ($D_{3h}$ symmetry) of three $^8$Heclusters, also appears around the threshold energy.

$^8$He and $^9$Li cluster structures in light nuclei