Low-lying dipole excitations in nuclei in the mass regions of the new dynamical symmetries

摘要

Experimental indications for the nuclear phase transitions described by the new symmetries E(5) and X(5) are discussed for the stable Ba, Nd, and Gd isotopes. Their low-lying dipole excitations, systematically investigated at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator, provide indications for the phase transitional behavior, including the proposed critical point candidates. (C) 2004 MAIK "Nauka/Interperiodica".