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An anomalous nuclear modification was reported by JLab measurements on theberyllium-9 structure function F_2. It is unexpected in the sense that anuclear modification slope is too large to be expected from its average nucleardensity. We investigated whether it is explained by a nuclear clusteringconfiguration in Be-9 with two \alpha nuclei and surrounding neutron clouds.Such clustering aspects are studied by using antisymmetrized molecular dynamics(AMD) and also by a simple shell model for comparison. We consider that nuclearstructure functions F_2^A consist of a mean conventional part and a remainingone depending on the maximum local density. The first mean part does not show asignificant cluster effect on F_2. However, we propose that the remaining onecould explain the anonymous JLab slope, and it is associated with highdensities created by the cluster formation in Be-9. The JLab measurement ispossibly the first signature of clustering effects in high-energy nuclearreactions. A responsible physics could be an internal nucleon modification,which is caused by the high densities due to the cluster configuration.

Clustering effects for explaining an anomalous JLab result on the Be-9 structure function