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Related Concept Videos

Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.1K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

852
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

963
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

657
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Updated: Jul 8, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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The 5α condensate state in 20Ne.

Bo Zhou1,2, Yasuro Funaki3, Hisashi Horiuchi4

  • 1Key Laboratory of Nuclear Physics and Ion-Beam Application (MoE), Institute of Modern Physics, Fudan University, 200433, Shanghai, China. zhou_bo@fudan.edu.cn.

Nature Communications
|December 11, 2023
PubMed
Summary
This summary is machine-generated.

Researchers found evidence of an alpha condensate state in the 20Ne nucleus using microscopic calculations. This discovery advances the understanding of alpha condensation in nuclear systems, building on the Hoyle state in carbon-12.

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Area of Science:

  • Nuclear Physics
  • Quantum Mechanics
  • Astrophysics

Background:

  • Alpha (α) clusters (two neutrons, two protons) are fundamental building blocks in light nuclei.
  • The Hoyle state in 12C is theorized as a 3α Bose-Einstein condensate, crucial for stellar nucleosynthesis.
  • Identifying similar alpha condensate states in heavier nuclei (Nα, N>3) is a significant challenge.

Purpose of the Study:

  • To investigate the possibility of alpha condensate states in the 20Ne nucleus.
  • To perform microscopic five-body calculations to analyze the structure of 20Ne.

Main Methods:

  • Microscopic five-body calculations were employed for the 20Ne nucleus.
  • Analysis focused on identifying states with condensate-like characteristics.

Main Results:

  • A specific excited 0+ state in 20Ne exhibits gas-like properties.
  • This state is identified as a potential five-alpha (5α) condensate state.
  • The findings provide evidence for alpha condensation beyond the 3α system.

Conclusions:

  • The identified 5α condensate state in 20Ne is a significant step towards confirming alpha condensation in nuclear fermion systems.
  • This research expands the concept of Bose-Einstein condensation to nuclear matter.