M. Hackstein

Enhanced quadrupole collectivity at N = 40: the case of neutron-rich Fe isotopes.

The transition rates for the 2_{1}^{+} states in 62,64,66Fe were studied using the Recoil Distance Doppler-Shift technique applied to projectile Coulomb excitation reactions. The deduced E2 strengths illustrate the enhanced collectivity of the neutron-rich Fe isotopes up to N=40. The results are interpreted by the generalized concept of valence proton symmetry which describes the evolution of nuclear structure around N=40 as governed by the number of valence protons with respect to Z~30. The deformation suggested by the experimental data is reproduced by state-of-the-art shell calculations with a new effective interaction developed for the fpgd valence space.

Lifetime measurements in

Lifetimes of the

^{63}

9/2^-_1

Co and

and

^{65}

3/2^-_1

Co

states in

Shape coexistence in neutron-deficient Hg isotopes studied via lifetime measurements in Hg-184,Hg-186 and two-state mixing calculations

^{63}

182Pt as a possible candidate for X(5) symmetry

Co and the

Lifetime measurement in the proton-unbound nucleus 109I

9/2^-_1

Different collectivity in the two signatures of the i13/2 stemming band in 167Yb

state in