Dipole resonances and the nuclear Schiff moment

Abstract

The nuclear Schiff moment creates a mechanism of transfer of the violation of parity and time-reversal invariance by weak interaction in nuclei into the atomic electric dipole moment. We point out an additional contribution to the Schiff moment generated by the mixing of single-particle states through the low-lying nuclear dipole resonances. An estimate shows that this contribution is by order of magnitude comparable to singleparticle contributions and can be enhanced if the low-lying resonance has collective nature.

Doorway states in flexural oscillations

“…In the sixties of the past century a prime example of a doorway state was the isobaric analogue state. Recently, the doorway-state mechanism has attracted renewed interest, since it has been observed in atoms and molecules [3][4][5][6][7][8], fullerenes [9,10], clusters [11], and quantum dots [12] among many other quantum systems. A connection between doorway states and super-radiant dynamics was also established [13].…”