Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-02-17
Phys.Rev.C74:025502,2006
Physics
Nuclear Physics
Nuclear Theory
27 pages, 3 figures, minor corrections in references added
Scientific paper
10.1103/PhysRevC.74.025502
Nuclear forces violating parity and time reversal invariance (${\cal P},{\cal T}$-odd) produce ${\cal P},{\cal T}$-odd nuclear moments, for example, the nuclear Schiff moment. In turn, this moment can induce the electric dipole moment in the atom. The nuclear Schiff moment is predicted to be enhanced in nuclei with static quadrupole and octupole deformation. The analogous suggestion of the enhanced contribution to the Schiff moment from the soft collective quadrupole and octupole vibrations in spherical nuclei is tested in this article in the framework of the quasiparticle random phase approximation with separable quadrupole and octupole forces applied to the odd $^{217-221}$Ra and $^{217-221}$Rn isotopes. We confirm the existence of the enhancement effect due to the soft modes. However, in the standard approximation the enhancement is strongly reduced by a small weight of the corresponding "particle + phonon" component in a complicated wave function of a soft nucleus. The perspectives of a better description of the structure of heavy soft nuclei are discussed.
Auerbach Naftali
Dmitriev Vladimir F.
Flambaum Victor V.
Lisetskiy A.
Sen'kov R. A.
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