Properties of dibaryons in nuclear medium

Abstract

Properties of six-quark dibaryons in nuclear medium are considered by example of A = 6 nuclei within the three-cluster α + 2N model. Dibaryon production in nuclei leads to the appearance of a threebody force between the dibaryon and nuclear core. This non-conventional scalar force is shown to provide an additional attractive contribution to the three-body binding energy. This three-body contribution improves noticeably agreement between theoretical results and experimental data for the majority of observables. The most serious difference between the traditional N Nforce models and the dibaryon-induced model is found for the nucleon momentum distribution, the latter model providing a strong enrichment of the high-momentum components both for 6 Li and 6 He cases. KeywordsNucleon-nucleon interaction • Dibaryon resonances • Structure of light nuclei 1 Introduction. What is dibaryon concept for nuclear force?The history of the nuclear force, i.e., the force which holds the nucleons in a nucleus together, is very long, contradictory and dramatic. It started almost immediately after the discovery of the neutron by J. Chadwick in 1932 and even now it can in no way be considered as completed. The dominant paradigm suggested by H. Yukawa in 1935 [1] is based on a general idea of pion exchange between nucleons both in free space and inside nuclei.