A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a $$^{85}\hbox {Br}\,\pi p_{3/2}\rightarrow \pi p_{1/2}$$ spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected $$^{85}\hbox {Br}$$ excitations as well as measured $$^{197}\hbox {Au}$$ excitations, an upper limit for the M1 transition strength of the $$1/2_1^-\rightarrow 3/2_\text {g.s.}^-$$ transition in $$^{85}\hbox {Br}$$ and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated $$1\pi $$ configuration on these estimates is deduced via Geant4 simulations.

first performance test of the Coulomb excitation multipolarimetry ( Coulex-multipolarimetry ) method is presented. It is based on a ^85Br π p_3/2→π p_1/2 spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected ^85Br excitations as well as measured ^197Au excitations, an upper limit for the M 1 transition strength of the 1/2_1^-→ 3/2_g.s.^- transition in ^85Br and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated 1π configuration on these estimates is deduced via Geant4 simulations.

One-phonon states of vibrational nuclei with mixed proton–neutron symmetry have been observed throughout the nuclear chart besides the mass A≈200 region. Very recently, it has been proposed that the 22+ state of 212Po is of isovector nature. This nucleus has two valence protons and two valence neutrons outside the doubly-magic 208Pb nucleus. The stable isotope 204Hg, featuring two valence-proton and valence-neutron holes, with respect to 208Pb, is the particle-hole mirror of 212Po. In order to compare the properties of low-lying isovector excitations in these particle-hole mirror nuclei, we have studied 204Hg by using the projectile Coulomb-excitation technique. The measured absolute B(M1;22+→21+) strength of 0.20(2)μN2 indicates that the 22+ level of 204Hg is at least the main fragment of the 21,ms+ state. For the first time in this mass region, both lowest-lying, one-quadrupole phonon excitations are established together with the complete set of their decay strengths. This allows for a microscopic description of their structures, achieved in the framework of the Quasi-particle Phonon Model.

T. Moller,1,* N. Pietralla,1 G. Rainovski,1,2 T. Ahn,1,3,† C. Bauer,1 M. P. Carpenter,4 L. Coquard,1 R. V. F. Janssens,4 J. Leske,1 C. J. Lister,4 E. A. McCutchan,4 O. Moller,1 D. Seweryniak,4 and S. Zhu4 1Institut fur Kernphysik, Technische Universitat Darmstadt, 64289 Darmstadt, Germany 2Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria 3Wright Nuclear Structure Laboratory, Yale University, New Heaven, Connecticut 06520, USA 4Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA (Received 29 May 2012; revised manuscript received 2 August 2012; published 17 September 2012)

We have remeasured and have redetermined the g factor for the 4(1)(+) state in Zn-68 following inconsistencies between earlier measurements and a recent result. We have reanalyzed several former measurements by applying an alternative analysis procedure, which allows for determining the precession effect separately for each gamma detector implying less uncertainties in the background subtraction for the relevant spectra. In addition, all measured g-factor and B(E2) data for the first 2(+) and 4(+) states in all stable even-A Zn isotopes and the radioactive Zn-62, are compared with new large-scale shell model calculations based on the most advanced effective interaction in the fpg-shell model space.

We have remeasured and have redetermined the $g$ factor for the ${4}_{1}^{+}$ state in $^{68}\mathrm{Zn}$ following inconsistencies between earlier measurements and a recent result. We have reanalyzed several former measurements by applying an alternative analysis procedure, which allows for determining the precession effect separately for each gamma detector implying less uncertainties in the background subtraction for the relevant spectra. In addition, all measured $g$-factor and $B(E2)$ data for the first ${2}^{+}$ and ${4}^{+}$ states in all stable even-$A$ Zn isotopes and the radioactive $^{62}\mathrm{Zn}$, are compared with new large-scale shell model calculations based on the most advanced effective interaction in the $\mathit{fpg}$-shell model space.

Coulomb excitation experiments in inverse kinematics on beams of stable Xe-134 132,Xe-130,Xe-128,Xe-126,Xe-124 ions impinging on a carbon target at energies of 82% of the respective Coulomb barriers have been performed. The one-phonon 2(1,ms)(+) states have been tracked and identified in Xe-134,Xe-132,Xe-130,Xe-128 from the 2(i,ms)(+) -> 2(1)(+) M1 strength distributions and from 0(1)(+) -> 2(i,ms)(+) E2 strength distributions responsible for the one-step Coulomb excitation processes. The evolution of the one-phonon 2(1,ms)(+) state within the seven even-even stable Xe isotopes is here presented.