Femtometer toroidal structures in nuclei
J.L. Forest,V.R. Pandharipande,Steven C. Pieper,Robert B. Wiringa,Rocco Schiavilla,A. Arriaga +5 more
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TLDR
The toroidal distribution of two-nucleon density distributions in states with isospin T=0, spin S=1 and projection M{sub S}=0 and {+-}1 are studied and indicate that the tensor correlations have near maximal strength at r < 2 fm in all these nuclei.Abstract:
The two-nucleon density distributions in states with isospin T=0, spin S=1 and projection M{sub S}=0 and {+-}1 are studied in {sup 2}H, {sup 3,4}He, {sup 6,7}Li and {sup 16}O. The equidensity surfaces for M{sub S}=0 distributions are found to be toroidal in shape, while those of M{sub S}={+-}1 have dumbbell shapes at large density. The dumbbell shapes are generated by rotating tori. The toroidal shapes indicate that the tensor correlations have near maximal strength at r < 2 fm in all these nuclei. They provide new insights and simple explanations of the structure and electromagnetic form factors of the deuteron, the quasi-deuteron model, and the dp, dd and {alpha}d L=2 (D-wave) components in {sup 3}He, {sup 4}He and {sup 6}Li. The toroidal distribution has a maximum-density diameter of {approximately}1 fm and a half-maximum density thickness of {approximately}0.9 fm. Many realistic models of nuclear forces predict these values, which are supported by the observed electromagnetic form factors of the deuteron, and also predicted by classical Skyrme effective Lagrangians, related to QCD in the limit of infinite colors. Due to the rather small size of this structure, it could have a revealing relation to certain aspects of QCD.read more
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Quantum Monte Carlo Calculations of Light Nuclei
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TL;DR: The variational method complemented with the use of explicitly correlated Gaussian basis functions is one of the most powerful approaches currently used for calculating the properties of few-body systems as mentioned in this paper.
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Parameter-free effective field theory calculation for the solar proton-fusion and hep processes
T.S. Park,T.S. Park,T.S. Park,Laura Elisa Marcucci,Rocco Schiavilla,Rocco Schiavilla,M. Viviani,A. Kievsky,S. Rosati,Kuniharu Kubodera,Kuniharu Kubodera,Dong-Pil Min,Mannque Rho,Mannque Rho +13 more
TL;DR: In this article, a parameter-free calculation of the threshold S factors for the solar and hep processes in an effective field theory (EFT) that combines the merits of the standard nuclear physics method and systematic chiral expansion was carried out.
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The Deuteron: Structure and Form Factors
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TL;DR: The question of rare configurations where the two nucleons overlap and loose their identity is still under debate as mentioned in this paper, and it is still looking for the elusive effects of quarks in the nuclear structure.
References
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Theoretical Nuclear Physics
TL;DR: A semi-empirical basis is used to describe and correlate the known nuclear properties including the theoretical concepts, methods, and considerations which have been devised in order to interpret the experimentsl material and to advance the ability to predict and control nuclear phenomena.