フェルミウム電荷半径のスムーズな傾向とシェル効果の影響
Jessica Warbinek1,2,3,4, Elisabeth Rickert5,6,7, Sebastian Raeder8,9
1GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. jessica.warbinek@cern.ch.
Nature
|October 31, 2024
まとめ
レーザースペクトロスコーピーは 重元素の核の大きさの傾向を明らかにします 核殻の影響は,より軽い核と比較して,これらの大きな核のサイズにあまり影響を与えないようです.
科学分野:
- 核物理学
- 原子物理学
- 量子力学
背景:
- 核殻構造は重核素 (Z100) の安定性と存在限界を規定する.
- より軽い核で観察されるように,シェル効果は原子核のサイズと形に影響します.
- 重いアクティニドの電荷半径と核モメントに関する実験データは限られている.
研究 の 目的:
- フェルミウム (Z=100) とノーベリウム (Z=102) の同位体鎖の核電荷半径とモメントを調査する.
- 自然に豊富な核酸と超重元素の間の実験データのギャップを埋めるために.
- 重元素の核の大きさのシェル効果の役割を理解する.
主な方法:
- フェルミウムとノベリウムの同位体鎖に沿ったレーザースペクトル測定
- 複数の生産計画と先進技術を活用する.
- 核の平均正方形の電荷半径を抽出するために,原子移行における同位体シフトを決定する.
主要な成果:
- フェルミウムとノベリウムの同位体鎖のレーザースペクトロスコーピーのデータを示した.
- 核の平均正方形の電荷半径の抽出変化
- 研究された同位体全体で核の大きさの円滑な進化を観測した.
結論:
- エネルギー密度関数に基づく核モデルは,観測された核サイズの円滑な進化を成功裏に再現します.
- モデル予測の一貫性は,より軽い核と比較して,この領域の核サイズにシェル効果が減少することを示唆しています.
- 発見は,最も重い元素の核の大きさを決定する上でシェル効果がより少ない体制への移行を示しています.
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