Liquid-Gas Instability and Superfluidity in Nuclear Matter | Zendy

Masayuki Matsuzaki | Zendy

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Liquid-Gas Instability and Superfluidity in Nuclear Matter

Author(s) -

Masayuki Matsuzaki

Publication year - 2006

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.116.127

Subject(s) - physics , instability , superfluidity , pairing , feynman diagram , propagator , condensed matter physics , nuclear matter , polarization (electrochemistry) , quantum electrodynamics , quantum mechanics , nucleon , nuclear physics , superconductivity , chemistry

We study effects of the medium polarization on superfluidity in symmetricnuclear matter in a relativistic formalism. An effect of the liquid-gasinstability is emphasized. We examine two types of decomposition of the nucleonpropagator; the standard Feynman-density and the particle-hole-antiparticleones. In both cases, the medium polarization effect is determined by acharacteristic cancellation among the \sigma, the longitudinal \omega, and the\sigma-\omega mixed polarizations. The instability leads to increase of pairinggap. Around the saturation density that is free from the instability the mediumpolarization enhances pairing gap in the former case whereas reduces in thelatter. At the lowest density that is also free from the instability the gapincreases in both cases.Comment: 20 pages, 10 figure

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