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Hadrons and Nuclei


Eur. Phys. J. A 13, 177-180 (2002)

Relativistic many-body theory with radioactive ion beams: Surface pion condensation

H. Toki

Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka, 567-0047, Japan

(Received: 1 May 2001 / Revised version: 30 June 2001)

Abstract
We critically review the present relativistic mean-field theory from the viewpoint of missing pions. We introduce the interesting experimental data on pionic states taken at RCNP. These data seem to suggest the occurrence of pion condensation in the nuclear surface. Qualitative discussion is made on the consequence of surface pion condensation on Gamow-Teller transitions and spin response functions and others. The radioactive ion beams are the tools of studying the unstable nuclei, which have extended nuclear surfaces. We shall start with radioactive ion beams the nuclear surface science, which includes the surface pion condensation as the important ingredient in addition to spin-orbit splitting and surface pairing.

PACS
21.10.-k - Properties of nuclei; nuclear energy levels.
21.10.Hw - Spin, parity, and isobaric spin.
21.30.Fe - Forces in hadronic systems and effective interactions.
21.60.Jz - Hartree-Fock and random-phase approximations.

© Società Italiana di Fisica, Springer-Verlag 2002