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Nuclear pairing gap: how low can it go?

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|November 5, 2013
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Researchers observed the smallest pairing gap in calcium-53 nuclei, explained by nuclear shell model calculations. This finding highlights shell gaps near the 1p(1/2) orbital and their impact on nuclear pairing.

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Area of Science:

  • Nuclear physics
  • Atomic physics

Background:

  • The pairing gap is a fundamental property in nuclear structure, influencing nuclear stability and reactions.
  • Previous studies have explored pairing phenomena in various isotopes, but experimental data for neutron-rich calcium isotopes remained limited.

Purpose of the Study:

  • To investigate the pairing gap in neutron-rich calcium-53 (53Ca) using newly acquired experimental mass data.
  • To explain the observed pairing gap behavior within the nuclear shell model framework.

Main Methods:

  • Experimental determination of the masses of calcium isotopes (52-54)Ca.
  • Theoretical analysis using the nuclear shell model with both schematic and realistic Hamiltonians.

Main Results:

  • The pairing gap for 53Ca was found to be the smallest ever observed.
  • Nuclear shell model calculations successfully reproduced this minimum pairing gap.
  • The results indicate the significant role of shell gaps around the low-j orbital 1p(1/2) in determining pairing properties.

Conclusions:

  • The observed minimal pairing gap in 53Ca is attributed to specific shell effects in the nuclear structure.
  • The study provides insights into the evolution of pairing correlations in neutron-rich nuclei.
  • Minima in pairing gaps across various nuclei are systematically presented and discussed.