最も重い元素における核シェル効果の直接マッピング
E Minaya Ramirez1, D Ackermann, K Blaum
1Helmholtz-Institut Mainz, 55099 Mainz, Germany.
まとめ
研究者らは,ノーベリウムとローレンシウム同位体の核結合エネルギーを測定した. これらの発見は,超重元素の"安定性の島"の位置を精錬し,シェル効果を確認するのに役立ちます.
科学分野:
- 核物理学 核物理学とは
- 量子力学は,量子力学という
- 化学 化学は化学です.
背景:
- 超重元素は,量子力学的なシェル効果により,強化された核結合を示し,予測された構造を形成します.
- 安定の島. 安定の島. 安定の島.
- , , ヽ , , , ヽ , , ヽ , , ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ
- この島の正確な位置と範囲は,Z = 118.まで元素の合成にもかかわらず,不明のままです.
- , , ヽ , , , ヽ , , ヽ , , ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ ヽ
- 高精度の質量スペクトロメトリーは,核結合エネルギーを測定し,シェル効果を定量化するために不可欠です.
研究 の 目的:
- ノベリウムとローレンチウムイソトープの核結合エネルギーを正確に測定するために.
- 核図のこの領域における砲弾効果の強さを判別する.
- 予測された位置と領域の境界を精査する.
- 安定の島. 安定の島. 安定の島.
主な方法:
- 高精度の質量スペクトロメトリを用いた.
- 測定は,選択されたノベリウムとローレンシウムイソトープで行われました.
- 核結合エネルギーは,実験データから直接決定されました.
主要な成果:
- ノベリウムとローレンチウムイソトープの正確な核結合エネルギーが得られた.
- これらの同位体における量子力学的なシェル効果の強さは定量化されました.
- 測定結果は,N = 152.の変形した殻の隙間を固定するための重要なデータを提供します.
結論:
- 実験データは,核弾丸の効果をより正確に理解するのに役立ちます.
- これらの発見は,よりよい境界線を描画するのに役立ちます.
- 安定した島の島です.
- 超重元素についてです.
- この研究は,核構造の研究における高精度質量スペクトロメトリーの重要性を検証しています.
関連する概念動画
The Energies of Atomic Orbitals
In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
Nuclear Stability
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
To hold positively charged protons together in the...
Nuclear Binding Energy
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound together;...
Nuclear Transmutation
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
Nuclear Overhauser Enhancement (NOE)
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
Atomic Radii and Effective Nuclear Charge
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.


