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978-3-8439-1124-5, Reihe Physik
Level lifetimes and quadrupole moments from projectile Coulomb excitation of A≈130 nuclei
163 Seiten, Dissertation Technische Universität Darmstadt (2013), Softcover, A5
The chain of experimentally accessible Barium isotopes represents a broad field regarding the evolution of nuclear quadrupole collectivity from the shell closure at N=82 towards and even beyond spherical-to-deformed shape transitions. Several isotopes ranging from stable Ba-130,132 towards radioactive Ba-140,142 have been studied with the projectile Coulomb excitation technique including the application of the Doppler-shift attenuation method (DSAM). Thereby lifetimes of quadrupole-collective states of Ba-132 and Ba-140 could be determined for the first time. Furthermore the static electric quadrupole moments of the first 2+ states for Ba-130,132 and Ba-140,142 were determined. The results are compared to Monte Carlo Shell Model and Beyond-Mean-Field calculations.
Another interesting feature in this mass region is the effect of shell stabilization in the N=80 isotones. This is further investigated by a measurement of the B(E2) values of Nd-140 and Sm-142.