在中子丰富核中高级结构 ^{128}Ag:证据表明银同位素中N=82封闭的坚固性
1Peking University, School of Physics and State Key Laboratory of Nuclear Physics and Technology, Beijing 100871, China.
Physical review letters
|June 27, 2025
概括
对中子丰富的银-128的光谱研究揭示了一种新的同位素. 贝模型计算证实了资历计划,突出了在Tin-132附近强大的N=82贝关闭.
科学领域:
- 核物理 核物理 核物理
- 原子和分子物理 原子和分子物理
背景情况:
- 研究极富中子原子核的结构,可以了解核力和外关闭.
- 双魔核Tin-132 (Z=50,N=82) 的南方区域对于理解核外演变至关重要.
研究的目的:
- 执行首次对非常富含中子原子核银-128 (128Ag) 的光谱研究.
- 识别和描述新的核状态,特别是同位素及其配置.
- 为了测试在N=82外关闭附近的奇偶核中资深计划的有效性.
主要方法:
- 在放射性同位素束工厂 (RIKEN) 使用放射性同位素束.
- 进行了光谱研究,分析了Ag的能量水平,旋转和平价.
- 进行外模型计算以解释观察到的核结构和相互作用.
主要成果:
- 在 ^{128}Ag 中发现了一种新的高级性同位素,其半衰期为1.60(7) μs,拟议的自旋平价为16−.
- 同位体的配置包括三个质子孔 (g9/2) 和一个中子孔 (h11/2).
- 观察到的级别结构通过外模型计算得到了很好的描述,支持接近 ^{132}Sn. 的资历计划.
- 质子-中子相互作用解释了Ag和In之间的低状态的反转.
- 光谱特征类似于邻近半魔核中的年长结构 (例如, ^{128}Pd, ^{130}Cd).
结论:
- 在银同位素中,N=82外封闭仍然很强,正如 ^{128}Ag 的光谱特征所证明的那样.
- 该研究提供了一个明确的案例,用于奇怪的核心的资历计划.
- 质子-中子相互作用在观察到的水平反转中发挥着关键作用.
更多相关视频
08:19Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
Published on: March 2, 2016
18.4K
14:11Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
27.0K
相关概念视频
Nuclear Stability
20.1K
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...
To hold positively charged protons together...
20.1K
Atomic Radii and Effective Nuclear Charge
53.6K
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.
53.6K
Atomic Structure
199.8K
Overview
199.8K
Electron Configuration of Multielectron Atoms
55.1K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
55.1K
Electron Configurations
20.4K
Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
20.4K
Atomic Nuclei: Nuclear Spin
3.1K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
3.1K
