Clustering structure of nuclei in deep inelastic processes

3rd International Workshop on "State of the Art in Nuclear Cluster Physics"

Hirai, M.^1 ; Kumano, S.^2,3,4,5 ; Saito, K.^5,6 ; Watanabe, T.^6

Nippon Institute of Technology, Saitama

345-8501, Japan^1

KEK Theory Center, Institute of Particle and Nuclear Studies, KEK, 1-1, Ooho, Tsukuba, Ibaraki

305-0801, Japan^2

Department of Particle and Nuclear Studies, Graduate University for Advanced Studies, 1-1, Ooho, Tsukuba, Ibaraki

305-0801, Japan^3

Theory Group, Particle and Nuclear Physics Division, J-PARC Center, 203-1, Shirakata, Tokai, Ibaraki

319-1106, Japan^4

J-PARC Branch, KEK Theory Center, Institute of Particle and Nuclear Studies, KEK, 203-1, Shirakata, Tokai, Ibaraki

319-1106, Japan^5

Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641, Yamazaki, Noda, Chiba

278-8510, Japan^6

关键词: Cluster formations;    Clustering effect;    Deep inelastic scattering;    Inelastic process;    Nuclear modification;    Nuclear structure;    Nucleon momentum distributions;    Structure functions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/569/1/012021/pdf
DOI  :  10.1088/1742-6596/569/1/012021

来源: IOP

【 摘 要 】

A clustering aspect is explained for the9Be nucleus in charged-lepton deep inelastic scattering. Nuclear modifications of the structure function F2 are studied by the ratio REMC FA2/FD2, where A and D are a nucleus and the deuteron, respectively. In a JLab experiment, an unexpectedly large nuclear modification slope |dREMC/dx| was found for9Be, which could be related to its clustering structure. We investigated a mean conventional part of a nuclear structure function FA2 by a convolution description with nucleon momentum distributions calculated by antisymmetrized (or fermionic) molecular dynamics (AMD) and also by a simple shell model. We found that clustering effects are small in the conventional part, so that the JLab result could be associated with an internal nucleon modification or a short-range nuclear correlation which is caused by high densities due to cluster formation.