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Proton electric pygmy dipole resonance
1Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt, Germany.
Physical Review Letters
|May 21, 2005
Summary
Researchers studied low-lying E1 strength in proton-rich nuclei using advanced models. They predict a new resonance, the proton pygmy dipole resonance, in nuclei near the proton drip line.
Area of Science:
- Nuclear Physics
- Astrophysical Nucleosynthesis
Background:
- Low-lying E1 excitations are crucial for understanding nuclear structure and reactions.
- Proton-rich nuclei near the drip line exhibit unique properties influencing nucleosynthesis.
Purpose of the Study:
- To investigate the evolution of low-lying E1 strength in proton-rich nuclei.
- To identify and characterize the nature of predicted dipole resonances in these exotic nuclei.
Main Methods:
- Utilized the self-consistent relativistic Hartree-Bogoliubov model.
- Employed the relativistic quasiparticle random-phase approximation (RQRPA) for calculations.
- Performed model calculations for N=20 isotones and Z=18 isotopes.
Main Results:
- Predicted pronounced dipole peaks below 10 MeV excitation energy for nuclei near the proton drip line.
- Identified these states as the proton pygmy dipole resonance (p-PDR).
- Analyzed proton and neutron transition densities and RQRPA amplitudes to confirm the p-PDR structure.
Conclusions:
- The study confirms the existence of the proton pygmy dipole resonance in proton-rich nuclei.
- The p-PDR is a significant feature influencing the nuclear response near the proton drip line.
- This finding has implications for understanding nuclear astrophysics and exotic nuclei.