Electric and magnetic dipole strength in 66Zn

R. Schwengner, R. Massarczyk, M. Scheck, W. Tornow, G. Battaglia, T. Beck, D. Bemmerer, N. Benouaret, R. Beyer, M. Butterling, F. Fiedler, S. W. Finch, C. Fransen, U. Friman-Gayer, A. Frotscher, R. Gonzalez, M. Grieger, A. Hartmann, T. Hensel, E. HoemannH. Hoffmann, R. V.F. Janssens, S. Johnson, M. D. Jones, A. R. Junghans, N. Kelly, J. Kleemann, Krishichayan, D. R. Little, F. Ludwig, S. E. Müller, D. O'Donnell, O. Papst, E. Pirovano, J. Sinclair, M. P. Takács, S. Turkat, S. Urlaß, A. Wagner, V. Werner, O. Wieland, J. Wilhelmy

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Abstract

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 quasimonoenergetic and linearly polarized photon beams of 30 energies within the range of 4.3 to 9.9 MeV at the HIγS facility. A total of 128 J=1 states were identified, among them 9 with 1+ and 86 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 photoabsorption 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.

Original languageEnglish
Article number024312
Number of pages14
JournalPhysical Review C
Volume103
Issue number2
DOIs
Publication statusPublished - 11 Feb 2021

Funding

We thank the operating crews of the ELBE accelerator and of the TUNL storage ring and FEL for their cooperation and we thank J. Isaak and D. Savran for their help in setting up the experiment at . Special thanks are due to B. A. Brown for his support in using the code NuShellX@MSU . This work was partially supported by the US Department of Energy (DOE), Office of Nuclear Physics, under Grants No. DE-FG02-97ER41033 (TUNL) and No. DE-FG02-97ER41041 (UNC). R.M. acknowledges support by the US Department of Energy, Office of Science, Office of Nuclear Physics under Grant No. LANLEM77. The UWS group acknowledges financial support from UK STFC (Grant No. ST/P005101/1). J.S. acknowledges financial support by the UK Nuclear Data Network. T.B. and V.W. acknowledge support by the BMBF Grant No. 05P18RDEN9 and J. W. acknowledges support by the BMBF Grant No. 05P18PKEN9. T.B., U.F., J.K., and O.P. are supported by the Deutsche Forschungsgemeinschaft under Grant No. SFB 1245 (Project ID 279384907). This work was also supported by the grant “Nuclear Photonics” within the LOEWE program of the State of Hesse. R.S. gratefully acknowledges the allocation of computing time through the Centers for High-Performance Computing of Technische Universität Dresden and of Helmholtz-Zentrum Dresden-Rossendorf.

Keywords

  • dipole strength
  • 66 Zn
  • photon-scattering experiments
  • bremsstrahlung
  • electron beams
  • quasicontinuum
  • unresolved transitions
  • spectra
  • branching transitions
  • statistical reaction model

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