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- W2059408023 abstract "On the basis of the ${}_{ensuremath{Lambda}}^{5}mathrm{He}+N+N$ three-body model which has successfully been applied to a systematic study of the energy and nucleon halo structure of the $A=7$ isotriplet hypernuclei, strengths of $ensuremath{gamma}$ transitions in ${}_{ensuremath{Lambda}}^{7}mathrm{Li}$ and ${}_{ensuremath{Lambda}}^{7}mathrm{He}$ are calculated. The new model confirms that the ${B(E2;5/2}^{+}ensuremath{rightarrow}{1/2}^{+})$ value in ${}_{ensuremath{Lambda}}^{7}mathrm{Li}$ is reduced remarkably in comparison with the corresponding ${B(E2;3}^{+}ensuremath{rightarrow}{1}^{+})$ in the core nucleus ${}^{6}mathrm{Li}.$This is due to the gluelike role of the $ensuremath{Lambda}$ particle which induces a contraction of the core nuclear size. It is suggested that a measurement of the ${5/2}^{+}ensuremath{rightarrow}{1/2}^{+}E2$ transition rate in ${}_{ensuremath{Lambda}}^{7}mathrm{Li}$ (ongoing at KEK as E419) provides a unique opportunity to derive the hypernuclear size and hence to confirm the size contraction experimentally. The $E2$ and $M1$ transition strengths are also predicted for low-lying states in the hypernucleus ${}_{ensuremath{Lambda}}^{7}mathrm{He}$ whose core nucleus ${}^{6}mathrm{He}$ is known to have a neutron halo. Another prediction is made of much enhanced $E2$ transitions in ${}_{ensuremath{Lambda}}^{7}mathrm{Li}$ from the ${5/2}^{+}$ and ${3/2}^{+}(T=1)$ states which are expected to have a proton halo structure." @default.
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- W2059408023 date "1999-05-01" @default.
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- W2059408023 title "γ transitions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mn /></mml:math>hypernuclei and a possible derivation of hypernuclear size" @default.
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- W2059408023 doi "https://doi.org/10.1103/physrevc.59.2351" @default.
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