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Deviations from the Isobaric Multiplet Mass Equation due to Threshold States.

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Isospin violation in A=16 nuclei is observed, deviating from expected mass behavior. This isospin violation is linked to nuclear structure changes caused by continuum coupling in proton-rich states.

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Area of Science:

  • Nuclear Physics
  • Quantum Mechanics

Background:

  • Isospin quintets for A=16 nuclei with Jπ=0+ and 2+ have been studied.
  • Observed mass-isospin projection dependence shows deviations from quadratic behavior, suggesting isospin violation beyond two-body forces.

Purpose of the Study:

  • To investigate the nature and origin of isospin violation in A=16 nuclei.
  • To explain the observed deviations from quadratic mass behavior using theoretical models.

Main Methods:

  • Analysis of experimental data for A=16 isospin quintets.
  • Application of the shell model embedded in the continuum.

Main Results:

  • Isospin violation is most pronounced in 2+ states.
  • Proton-rich states in 16Ne and 16F are threshold resonances affected by s-wave continuum coupling.
  • Deviations provide information on continuum-coupling energy corrections.
  • p-wave continuum coupling is indicated for the ground state of 8C.

Conclusions:

  • Isospin violation in A=16 nuclei is attributed to modifications in nuclear structure due to continuum coupling.
  • The open-quantum-system nature of proton-rich nuclei plays a crucial role.
  • Continuum coupling significantly influences the properties of threshold states.