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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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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...
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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.
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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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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Short-Range Correlations and Urca Process in Neutron Stars.

Armen Sedrakian1

  • 1<a href="https://ror.org/05vmv8m79">Frankfurt Institute for Advanced Studies</a>, D-60438 Frankfurt am Main, Germany and Institute of Theoretical Physics, <a href="https://ror.org/00yae6e25">University of Wroclaw</a>, 50-204 Wroclaw, Poland.

Physical Review Letters
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Summary
This summary is machine-generated.

High-momentum neutron-proton pairs in compact stars challenge Fermi-liquid theory. Incorporating short-range correlations alters the Urca process rate, impacting theories on compact star cooling.

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Area of Science:

  • Nuclear Physics
  • Astrophysics
  • Compact Star Physics

Background:

  • Recent JLab experiments reveal high-momentum neutron-proton pairs in compact stars.
  • These findings deviate from predictions of the standard Fermi-liquid theory for neutron-proton fluid mixtures.

Purpose of the Study:

  • To investigate the impact of non-Fermi liquid contributions on the Urca process rate in compact stars.
  • To analyze how short-range correlations affect the proton spectral widths and Urca process.

Main Methods:

  • Calculation of the Urca process rate.
  • Inclusion of non-Fermi liquid effects from short-range correlations on proton spectral widths.

Main Results:

  • The Urca process rate shows significant deviation from Fermi-liquid predictions at low temperatures.
  • The previously high threshold for the Urca process in neutron stars is replaced by a smooth increase with proton fraction.

Conclusions:

  • Short-range correlations significantly modify the Urca process in compact stars.
  • These modifications may have substantial implications for understanding compact star cooling mechanisms.