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• W1982912775 startingPage "1767" @default.
• W1982912775 abstract "Differential cross sections for $ensuremath{alpha}+ensuremath{alpha}$ elastic scattering have been measured at lab energies of 18.00, 21.12, 24.11, 25.50, 26.99, 28.50, and 29.50 MeV. The majority of the data have relative errors less than 1%, and the additional error in absolute scale is 0.30%. A phase-shift analysis of the data has been performed, and most of the phase shifts have been determined to within $ifmmodepmelsetextpmfi{}frac{1}{3}ifmmode^circelsetextdegreefi{}$. These phase shifts and others from the literature were used to study properties of the $ensuremath{alpha}+ensuremath{alpha}$ system in the center of mass energy range 1.50 to 14.74 MeV. First, an $R$-matrix analysis was made of the $l=4$ phase shifts; this analysis yields a resonance energy of 11.7 ifmmodepmelsetextpmfi{} 0.4 MeV and a level width at resonance of 4.0 ifmmodepmelsetextpmfi{} 0.4 MeV. Second, comparison was made of the $ensuremath{alpha}+ensuremath{alpha}$ phase shifts with results of previous resonating-group calculations, and this comparison shows good agreement with a calculation which includes one inelastic channel and a nucleon-nucleon repulsive core. Third, an $ensuremath{alpha}+ensuremath{alpha}$ potential model was constructed. This model contains an attractive potential obtained by folding Gaussian $ensuremath{alpha}$-particle densities together with a Yukawa-shaped direct part of a nucleon-nucleon potential and, in addition, contains phenomenological short-range repulsive components in the $l=0$ and $l=2$ states. The model reproduces the experimental phase shifts quite well when the Yukawa potential is taken to have a range corresponding to a two-pion mass.NUCLEAR REACTIONS $^{4}mathrm{He}(ensuremath{alpha},ensuremath{alpha})^{4}mathrm{He}$, $E=18.00ensuremath{-}29.50$ MeV; measured $ensuremath{sigma}(E; ensuremath{theta})$; deduced phase shifts $l=0,2,4,6$. $R$-matrix analysis $l=4$. Comparison with resonating-group calculations. Potential-model analysis." @default.
• W1982912775 created "2016-06-24" @default.
• W1982912775 creator A5015282762 @default.
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• W1982912775 date "1974-11-01" @default.
• W1982912775 modified "2023-09-26" @default.
• W1982912775 title "Study of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>α</mml:mi><mml:mo>+</mml:mo><mml:mi>α</mml:mi></mml:math>system below 15 MeV (c.m.)" @default.
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• W1982912775 doi "https://doi.org/10.1103/physrevc.10.1767" @default.
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