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

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

2011-03-09

arxiv.org/abs/1103.1681v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, LaTeX, 7 eps files, to be published in Proceedings of the international conference on the structure of baryons, Dec.

Scientific paper

An anomalous nuclear modification was reported by JLab measurements on the beryllium-9 structure function F_2. It is unexpected in the sense that a nuclear modification slope is too large to be expected from its average nuclear density. We investigated whether it is explained by a nuclear clustering configuration 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 nuclear structure functions F_2^A consist of a mean conventional part and a remaining one depending on the maximum local density. The first mean part does not show a significant cluster effect on F_2. However, we propose that the remaining one could explain the anonymous JLab slope, and it is associated with high densities created by the cluster formation in Be-9. The JLab measurement is possibly the first signature of clustering effects in high-energy nuclear reactions. A responsible physics could be an internal nucleon modification, which is caused by the high densities due to the cluster configuration.

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