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The effects of three body forces induced in the 3He, 4He systems by the requirements of quark antisymmetry are estimated in the context of a QCD-inspired non-relativistic potential model. The results are found to be sensitive to both the short distance structure of the spin independent quark potential and poorly known short distance features of the nuclear wavefunction, but suggest that quark induced...
This paper reviews the consequences of multi-quark correlations in nuclei which arise through the particular cluster decomposition of the nuclear ground state specified by the quark cluster model (QCM). The critical radius of a three quark cluster, R , controls the formation probability of larger clusters. The value of R,;0.50 fm is fixed by fits to deep inelastic lepton nucleus scattering da a. The...
Recent calculations within the Hybrid Quark-Hadron model of threshold deuteron electrodisintegration, deuteron electromagnetic form factors, and 3He and 3H electromagnetic form factors for 0 < q2 < (2 GeV/c)2 are discussed. Striking six-quark cluster effects are found. Needed theoretical improvements and light-cone boosts to go to the region of QCD perturbation theory are discussed.
The nuclear physics program at SLAC is currently dominated by the study of constituents of nuclei. The EMC effect indicates that additional degrees of freedom exist in nuclei and probably in the three body system. Past measurements of electron scattering cross sections from 3He at large Q2 and large x are consistent with the EMC effect. Future measurements of elastic scattering from 3H...
With a luminosity of 10scm−2s−1 of polarized electrons incident on a polarized 3He target, one could undertake very fundamental measurements on the neutron in 3He in the quasielastic, resonance, and deep inelastic regions. Using a reasonable choice of indicated running parameters, the running time for an interesting series of measurements in each of these kinematic regions is of the order of 30 days...
Questions concerning the effects of relativistic invariance can and should be separated from questions concerning the relevant subnucleon degrees of freedom that should be treated explicitly. It is possible to formulate Poincard invariant quark models with a finite number of quarks. In such models hadron states have definite spin, a feature which is absent in light-front perturbative treatments...
We analyze the structure of the (3→3)-nucleon amplitude appearing in proton-deuteron elastic scattering amplitude. We calculate that part of the amplitude, which can be unambiguously expressed, through analyticity and unitarity, in terms of physical (2→2)-nucleon amplitudes. By comparing the result with the experimental data on spin observables we find that it is necessary to add extra terms, which...
We stress the point that, as long as nucleons possess substructure of some kind, three-nucleon forces must exist in different forms. Using a quark model to characterize the nucleon substructure, we may classify three-nucleon forces into three distinct categories, viz.: (i) Three-nucleon forces of type I, such as the Tucson-Melbourne (2π)-exchange three-body force, which can be formulated in terms...
A brief summary of the deliberations of the Symposium, as prepared immediately after for remarks at the Spring Meeting of the American Physical Society, is given.
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