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Abstract
A projectile Coulomb-excitation experiment was performed at the radioactive ion beam facility HIE-ISOLDE at CERN. The radioactive 140Nd and 142Sm ions were post accelerated to the energy of 4.62 MeV/A and impinged on a 1.45 mg/cm2-thin 208Pb target. The γ rays depopulating the Coulomb-excited states were recorded by the HPGe-array MINIBALL. The scattered charged particles were detected by a double-sided silicon strip detector in forward direction. Experimental γ-ray intensities were used for the determination of electromagnetic transition matrix elements. Preliminary results for the reduced transition strength of the \(\rm {B}(M1; {2}_{3}^{+}\to {2}_{1}^{+})=0.35(19) {\mu }_{\rm {N}}^{2}\) of 140Nd and a first estimation for 142Sm have been deduced using the Coulomb-excitation calculation software GOSIA. The \({2}_{3}^{+}\) states of 140Nd and 142Sm show indications of being the main fragment of the proton-neutron mixed-symmetry \({2}_{1,\rm {ms}}^{+}\) state.
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Details
1 Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
2 Faculty of Physics, St. Kliment Ohridski University of Sofia, Sofia, Bulgaria
3 CERN, Geneva, Switzerland
4 Institüt für Kernphysik, Universität zu Köln, Cologne, Germany
5 CERN, Geneva, Switzerland; Department of Nuclear Physics, University of Lund, Lund, Sweden
6 Department of Physics, University of York, York, United Kingdom
7 CERN, Geneva, Switzerland; Department of Physics, University of Jyväskylä, Jyväskylä, Finland
8 CEPS, University of the West of Scotland, Paisley, United Kingdom
9 Department of Physics, University of Western Cape, Bellville, South Africa; iThemba LABS, National Research Foundation, Somerset West, South Africa
10 Department of Physics, University of Jyväskylä, Jyväskylä, Finland
11 Department of Nuclear Physics, University of Lund, Lund, Sweden
12 ELI-NP, Magurele, Romania
13 Instituut voor Kern- en Strahlingsfysica, K.U. Leuven, Leuven, Belgium