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Fission barrier of actinide nuclei with double-$$Lambda$$ particles within the Skyrme-Hartree-Fock method

Skyrme-Hartree-Fock法を用いたダブル$$Lambda$$ハイパー核核分裂バリアの研究

湊 太志; 千葉 敏

Minato, Futoshi; Chiba, Satoshi

二つの$$Lambda$$ハイペロンを含んだアクチノイド核の核分裂をSkyrme-Hartree-Fock法を用いて理論的に調べた。$$Lambda$$-$$N$$$$Lambda$$-$$Lambda$$間相互作用にはSkyrme型のゼロレンジ相互作用を用い、幾つかの$$Lambda$$-$$Lambda$$相互作用パラメータを用いて核分裂バリアを調べた。核分裂バリアは$$Lambda$$粒子の数が増えるほど高くなり、またバリア幅は$$Lambda$$-$$Lambda$$相互作用に依存していることがわかった。さらに原子核内部の微視的メカニズムについて詳細な議論を行い、バリアの高さと幅の変化には$$Lambda$$粒子の束縛エネルギーと密度分布の相関が強くかかわっていることを解明した。また二つの$$Lambda$$粒子は重い核分裂片側へ引き寄せられていくことがわかった。

Fission of actinide nuclei including two $$Lambda$$ hyperons is studied in the framework of the Skyrme-Hartree-Fock approach. We adopt the zero-range Skyrme type interaction between $$Lambda$$-$$N$$ and $$Lambda$$-$$Lambda$$. Fission barrier is investigated using several parameter sets for $$Lambda$$$$Lambda$$ interactions. We obtain the result that the barrier height becomes higher as the number of $$Lambda$$ particle increases and the barrier width has a dependence on the $$LambdaLambda$$ interaction. A relation between $$Lambda$$ binding energy and density distribution of $$Lambda$$ particle inside a core nucleus are also discussed. We found that the both $$Lambda$$ particles are attracted into heavier fission fragment.

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