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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Pairing and Short-Range Correlations in Nuclear Systems.

A Rios1, A Polls2, W H Dickhoff3

  • 11Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH UK.

Journal of Low Temperature Physics
|July 2, 2019
PubMed
Summary
This summary is machine-generated.

Short-range correlations significantly reduce the pairing gap in nuclear matter. This effect is substantial in triplet nuclear matter, where short-range correlations alone cause a 50% reduction.

Keywords:
Neutron matterNuclear matterNuclear physicsSuperfluidity

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Area of Science:

  • Nuclear Physics
  • Astrophysical Phenomena
  • Quantum Many-Body Systems

Background:

  • The pairing gap in infinite nuclear matter is crucial for understanding astrophysical phenomena and nuclear structure.
  • Short-range correlations (SRCs) are known to deplete single-particle strength near the Fermi surface.
  • The impact of SRCs on the pairing gap requires detailed investigation across different matter types and spin channels.

Purpose of the Study:

  • To investigate the influence of short-range correlations (SRCs) on the pairing gap in infinite neutron and symmetric nuclear matter.
  • To analyze this effect in both singlet and triplet spin channels.
  • To quantify the reduction in the pairing gap attributable to SRCs.

Main Methods:

  • Utilized phase-shift equivalent interactions as a basis for calculations.
  • Employed chiral two-body and three-body interactions.
  • Performed calculations for neutron matter and symmetric nuclear matter in singlet and triplet channels.

Main Results:

  • Observed an unambiguous reduction of the pairing gap in all studied channels.
  • Found minimal dependence on the nucleon-nucleon (NN) force in singlet neutron matter and triplet nuclear matter channels.
  • Demonstrated that SRCs alone account for a 50% reduction in the pairing gap for triplet nuclear matter.

Conclusions:

  • Short-range correlations play a significant role in reducing the pairing gap in nuclear matter.
  • The reduction is substantial and largely independent of the specific NN interaction in certain channels.
  • These findings have implications for nuclear structure and astrophysical processes sensitive to pairing properties.