Dineutron structure in ${}^8$He

Abstract

The ground and excited states of ${}^8$He were investigated with a method of antisymmetrized molecular dynamics(AMD). We adopted effective nuclear interactions which systematically reproduce the binding energies of ${}^4$He, ${}^6$He and ${}^8$He. The ground state of ${}^8$He has both the $j$-$j$ coupling feature($p_{3/2}$ closure) and the $L$-$S$ coupling feature(${}^4$He$+2n+2n$) with a slight tail of dineutron at the long distance region. The theoretical results give an indication of the $0_2^{+}$ state with dineutron gas-like structure. The dineutron structure, ${}^4$He+$2n$+$2n$, of this state is similar to the $3\alpha$-cluster structure of the ${}^{12}$C($0_2^{+}$) state which has been interpreted as an $\alpha$ condensate state. Since the ${}^8$He($0_2^{+}$) state has a significant overlap with the dineutron condensate wave function where two dineutrons are moving in $S$ wave around the $\alpha$ core with a dilute density, we suggest that this theoretically predicted $0_2^{+}$ state is a candidate of the dineutron condensate state.

12 pages, 5 figures, submitted to PRC

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Cited by in corpus (21)

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• Strong dineutron correlation in 8He and 18C
• Five-body resonances of 8He using the complex scaling method
• Cluster states and monopole transitions in ${}^{16}$O
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• Experimental study of intruder components in light neutron-rich nuclei via single-nucleon transfer reaction
• Di-neutron correlation in monopole two-neutron transfer modes in Sn isotope chain
• Dineutron formation and breaking in ${}^8$He
• Dineutron correlations in quasi two-dimensional systems in a simplified model and possible relation to neutron-rich nuclei
• Cooper pair sizes in 11Li and in superfluid nuclei: a puzzle?
• Five-body resonances in ${}^8$He and ${}^8$C using the complex scaling method
• Effective interactions between nuclear clusters
• Asymptotics of neutron Cooper pair in weakly bound nuclei
• 2alpha+t cluster feature of $3/2_3^{-}$ state in ${}^{11}$B
• Dineutron-dineutron correlation in ${}^8$He
• Analysis of the effect of core structure upon dineutron correlation using antisymmetrized molecular dynamics
• Two-neutron correlations in microscopic wave functions of He-6, He-8 and C-12
• Systematic study for relation between nuclear structure and reaction in ${}^{10}$Be nucleus
• Dineutron clusters in ${}^7$He and ${}^8$He structure
• Resonances and continuum states of drip-line nuclei using the complex scaling method
• The influence of experimental setup on the spectroscopy investigation of ${}^{14}$Be by Coulomb breakup reaction