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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
Thomson's e/m Experiment01:19

Thomson's e/m Experiment

In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...

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Tensor correlations measured in 3He(e,e' pp)n.

H Baghdasaryan1, L B Weinstein, J M Laget

  • 1Old Dominion University, Norfolk, Virginia 23529, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

This study measured the Helium-3 (3He) electron scattering reaction. Researchers observed a higher ratio of proton-proton (pp) to proton-neutron (pn) pairs at high total momentum, indicating tensor correlations dominate.

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Area of Science:

  • Nuclear physics
  • Quantum chromodynamics
  • Hadron physics

Background:

  • Understanding nucleon-nucleon correlations in nuclei is crucial for nuclear structure and quantum chromodynamics.
  • Previous studies have explored nucleon pair correlations, but direct measurements of the pp to pn ratio in 3He are limited.

Purpose of the Study:

  • To measure the 3He(e,e' pp)n reaction at 4.7 GeV.
  • To investigate the ratio of spectator correlated proton-proton (pp) to proton-neutron (pn) pairs.
  • To determine the influence of nucleon-nucleon correlations on nuclear structure.

Main Methods:

  • Electron scattering experiments on Helium-3 (3He) at a high incident energy of 4.7 GeV.
  • Utilizing specific kinematic cuts to identify spectator correlated pp and pn nucleon pairs.
  • Measuring the relative and total momentum distributions of these nucleon pairs.

Main Results:

  • The first measurement of the pp to pn pair ratio as a function of total momentum (p(tot)) was performed.
  • For relative momenta between 0.3 and 0.5 GeV/c, the pp/pn ratio was found to be small at low p(tot) and increased to approximately 0.5 at high p(tot).

Conclusions:

  • The observed increase in the pp/pn ratio with total momentum suggests the dominance of tensor correlations over central correlations.
  • These findings provide critical experimental data for refining models of short-range nucleon-nucleon interactions within nuclei.