F. Stedile

Proton–neutron structure of the N=52 nucleus 92Zr

Abstract Following the successful identification of mixed-symmetric one- and two-phonon states in the N=52 nuclei 94Mo and 96Ru, we have performed a photon scattering experiment on the N=52 isotone 92Zr. Experimental data and shell model calculations show that both, single particle and collective degrees of freedom are present in the low-lying levels of 92Zr. The second excited quadrupole state shows the signatures of the one-phonon mixed-symmetric 2+ state, while calculations and data indicate an almost pure neutron configuration for the 2+1 state, in contradiction with the F-spin symmetric limit. Furthermore, two strong dipole excitations, which are candidates for the two-phonon quadrupole–octupole coupled E1 excitation and for the mixed-symmetric 1+ two-phonon state, were observed.

Low-lying dipole excitations in the stable Cd isotopes: A systematics

Low-lying dipole excitations in the medium-weight vibrational nuclei of the Cd isotopic chain were investigated by means of nuclear resonance fluorescence experiments performed at the bremsstrahlung beam of the Stuttgart Dynamitron accelerator (endpoint energy 4.1 MeV). Detailed information has been obtained on excitation energies, spins, decay widths, and transition probabilities of numerous excited states in 110–114,116Cd. Additionally, the use of two Compton polarimeters enabled model-independent parity assignments for excitations in the even-even isotopes. Strongly excited Jπ = 1− states are found in all even-even Cd nuclei at excitation energies near the sumof the energies of the first 2+ and 3− states. These excitations are interpreted as the 1− member of the quadrupole-octupole coupled quintuplet (2+⊗3−). The fragmented strength observed in the odd isotopes 111,113Cd is compared with the strength distributions in the neighboring even-even Cd isotopes.

Two-phonon 1- state in Sn-112 observed in resonant photon scattering

Results of a photon scattering experiment on

New findings for mixed‐symmetry states

^{112}\mathrm{Sn}

Dipole strength distributions of the stable odd-mass N=82 isotones {sup 139}La and {sup 141}Pr

using bremsstrahlung with an endpoint energy of

Low-lying J=1 states in {sup 106}Cd

{E}_{0}=3.8

Two-phonon 1{sup -} state in {sup 112}Sn observed in resonant photon scattering

MeV are reported. A

Two-phonon1−state inSn112observed in resonant photon scattering

J=1

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

state at

Systematics of low-lying E1 and M1 excitations in heavy nuclei from photon scattering experiments

{E}_{x}=3434(1)