Electric and magnetic dipole strength in 66Zn

Electric and magnetic dipole strength in 66Zn

Schwengner, R.; Massarczyk, R.; Scheck, M.; Tornow, W.; Brown, B. A.; Battaglia, G.; Beck, T.; Bemmerer, D.; Benouaret, N.; Beyer, R.; Butterling, M.; Fiedler, F.; Finch, S. W.; Fransen, C.; Friman-Gayer, U.; Frotscher, A.; Gonzalez, R.; Grieger, M.; Hartmann, A.; Hensel, T.; Hoemann, E.; Hoffmann, H.; Isaak, J.; Janssens, R. V. F.; Johnson, S.; Jones, M. D.; Junghans, A.; Kelly, N.; Kleemann, J.; Krishichayan, F.; Little, D. R.; Ludwig, F.; Müller, S.; Odonnell, D.; Pirovano, E.; Savran, D.; Sinclair, J.; Takacs, M. P.; Turkat, S.; Urlaß, S.; Wagner, A.; Wieland, O.; Wilhelmy, J.

The dipole strength of the nuclide 66Zn was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.5 and 13.4 MeV at the γELBE facility as well as using quasi-monoenergetic and linearly polarized photon beams of 30 energies within the range from 4.3 to 9.9 MeV at the HIγS facility. About 140 J = 1 states were identified, out of them 9 with 1+ and 84 with 1- assignments. The quasicontinuum of unresolved transitions was included in the analysis of the spectra and the intensities of branching transitions were estimated on the basis of simulations of statistical γ-ray cascades. As a result, the photoabsorpton cross section up to the neutron-separation energy was determined and compared with predictions of the statistical reaction model. The experimental M1 strengths from resolved 1+ states are compared with results of large-scale shell-model calculations.

Keywords: Photon scattering; nuclear resonance fluorescence; dipole excitations; photoabsorption cross section; electromagnetic transitions; statistical reaction model; shell model

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